Category Archives: Arduino

In this video lesson we create a client server connection between Python running on your desktop computer, and your Arduino project. We show how to make the connection over WiFi, and how to pass data and commands back and forth between your Arduino and your desktop computer. We then show how to build an attractive Graphical User Interface in PyQt5 to control your arduino project from your desktop wirelessly. For this simple example, we will control an RBG LED from the GUI.

This is the circuit schematic of the Arduino;

Schematic of our Arduino Uno R4 Wifi connected to an RGB LED

When using the breadvolt, or any battery power supply on a breadboard project, do not turn the power supply on while the Raspberry Pi Pico is connected to USB, as you could generate voltage conflicts. It is an either or. If the USB is connected, the power supply should be OFF. Or if you are going to connect the USB, first turn off the power supply.

For your convenience we include the code developed in the video below. This first program is the server side program, for the arduino:

#include <WiFiS3.h>
#include "secrets.h"
WiFiUDP udp;
int PORT = 12345;
String myString;
String stringArray[10];
String response = "ACK\n";

int redPin = 9;
int greenPin = 10;
int bluePin = 11;

void setup() {
  Serial.begin(9600);
  pinMode(redPin,OUTPUT);
  pinMode(greenPin,OUTPUT);
  pinMode(bluePin,OUTPUT);
  Serial.print("Connecting to ");
  Serial.println(mySSID);
  WiFi.begin(mySSID, myPASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi");
  Serial.println(WiFi.localIP());
  udp.begin(PORT);
  Serial.print("UDP Server started on port ");
  Serial.print(PORT);
  // put your setup code here, to run once:
}
void splitString() {
  int startIndex = 0;
  int indexCount = 0;
  int i;
  int j;
  myString = myString + ':';
  for (i = 0; i < myString.length(); i = i + 1) {
    if (myString[i] == ':') {
      stringArray[indexCount] = myString.substring(startIndex, i);
      indexCount = indexCount + 1;
      startIndex = i + 1;
    }
  }
  for (j = 0; j < indexCount; j = j + 1) {
    Serial.println(stringArray[j]);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  if (udp.parsePacket()) {
    myString = udp.readStringUntil('\n');
    Serial.println("Received : " + myString);
    udp.beginPacket(udp.remoteIP(), udp.remotePort());
    udp.print(response);
    udp.endPacket();
    Serial.println("SENT: " + response);
    splitString();
    if (stringArray[0]=="redblink"){
      for (int i =0; i<stringArray[1].toInt();i=i+1){
        Serial.println("Blink Red");
        digitalWrite(redPin,HIGH);
        delay(stringArray[2].toInt());
          digitalWrite(redPin,LOW);
        delay(stringArray[2].toInt());
      }      
    }
        if (stringArray[0]=="greenblink"){
      for (int i =0; i<stringArray[1].toInt();i=i+1){
        Serial.println("Blink Green");
        digitalWrite(greenPin,HIGH);
        delay(stringArray[2].toInt());
          digitalWrite(greenPin,LOW);
        delay(stringArray[2].toInt());
      }      
    }    if (stringArray[0]=="blueblink"){
      for (int i =0; i<stringArray[1].toInt();i=i+1){
        Serial.println("Blink Blue");
        digitalWrite(bluePin,HIGH);
        delay(stringArray[2].toInt());
          digitalWrite(bluePin,LOW);
        delay(stringArray[2].toInt());
      }      
    }
    if (stringArray[0]=="redOn"){
      digitalWrite(redPin,HIGH);
    }
        if (stringArray[0]=="redOff"){
      digitalWrite(redPin,LOW);
    }
        if (stringArray[0]=="greenOn"){
      digitalWrite(greenPin,HIGH);
    }
        if (stringArray[0]=="greenOff"){
      digitalWrite(greenPin,LOW);
    }
        if (stringArray[0]=="blueOn"){
      digitalWrite(bluePin,HIGH);
    }
        if (stringArray[0]=="blueOff"){
      digitalWrite(bluePin,LOW);
    }
  }
}

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#include <WiFiS3.h>

#include "secrets.h"

WiFiUDP udp;

int PORT = 12345;

String myString;

String stringArray[10];

String response = "ACK\n";

int redPin = 9;

int greenPin = 10;

int bluePin = 11;

void setup() {

Serial.begin(9600);

pinMode(redPin,OUTPUT);

pinMode(greenPin,OUTPUT);

pinMode(bluePin,OUTPUT);

Serial.print("Connecting to ");

Serial.println(mySSID);

WiFi.begin(mySSID, myPASS);

while (WiFi.status() != WL_CONNECTED) {

delay(100);

Serial.print(".");

}

Serial.println("\nConnected to WiFi");

Serial.println(WiFi.localIP());

udp.begin(PORT);

Serial.print("UDP Server started on port ");

Serial.print(PORT);

// put your setup code here, to run once:

}

void splitString() {

int startIndex = 0;

int indexCount = 0;

int i;

int j;

myString = myString + ':';

for (i = 0; i < myString.length(); i = i + 1) {

if (myString[i] == ':') {

stringArray[indexCount] = myString.substring(startIndex, i);

indexCount = indexCount + 1;

startIndex = i + 1;

}

for (j = 0; j < indexCount; j = j + 1) {

Serial.println(stringArray[j]);

}

void loop() {

// put your main code here, to run repeatedly:

if (udp.parsePacket()) {

myString = udp.readStringUntil('\n');

Serial.println("Received : " + myString);

udp.beginPacket(udp.remoteIP(), udp.remotePort());

udp.print(response);

udp.endPacket();

Serial.println("SENT: " + response);

splitString();

if (stringArray[0]=="redblink"){

for (int i =0; i<stringArray[1].toInt();i=i+1){

Serial.println("Blink Red");

digitalWrite(redPin,HIGH);

delay(stringArray[2].toInt());

digitalWrite(redPin,LOW);

delay(stringArray[2].toInt());

}

if (stringArray[0]=="greenblink"){

for (int i =0; i<stringArray[1].toInt();i=i+1){

Serial.println("Blink Green");

digitalWrite(greenPin,HIGH);

delay(stringArray[2].toInt());

digitalWrite(greenPin,LOW);

delay(stringArray[2].toInt());

}

} if (stringArray[0]=="blueblink"){

for (int i =0; i<stringArray[1].toInt();i=i+1){

Serial.println("Blink Blue");

digitalWrite(bluePin,HIGH);

delay(stringArray[2].toInt());

digitalWrite(bluePin,LOW);

delay(stringArray[2].toInt());

}

if (stringArray[0]=="redOn"){

digitalWrite(redPin,HIGH);

}

if (stringArray[0]=="redOff"){

digitalWrite(redPin,LOW);

}

if (stringArray[0]=="greenOn"){

digitalWrite(greenPin,HIGH);

}

if (stringArray[0]=="greenOff"){

digitalWrite(greenPin,LOW);

}

if (stringArray[0]=="blueOn"){

digitalWrite(bluePin,HIGH);

}

if (stringArray[0]=="blueOff"){

digitalWrite(bluePin,LOW);

}

You will need to save your WiFi name and password in your ‘secrets.h’ file, which you create in a new tab, as explained in the video.

#define mySSID "YOUR WIFI NAME"
#define myPASS "YOUR WIFI PASSWORD"

1 2	#define mySSID "YOUR WIFI NAME" #define myPASS "YOUR WIFI PASSWORD"

Now, for the client side, this is the Python code for creating the Graphical User Interface using PyQt5.

from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
import sys
import socket
 
# Arduino’s IP address (from Arduino Serial Monitor)
HOST = "192.168.88.33"  # Use Your Arduino's IP. It will print when
                        #You Run the Arduino Server Program
PORT = 12345            # Must match Arduino’s UDP port
 
# Create a UDP socket
mySocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
mySocket.settimeout(5.0)  # 5 seconds timeout for responses

app = QApplication([])

window = QMainWindow()
window.setWindowTitle('Welcome to GUI World')
window.setGeometry(100,100,500,300)

widgetContainer = QWidget()
window.setCentralWidget(widgetContainer)
mainLayout = QVBoxLayout(widgetContainer)

label = QLabel("Welcome to PyQt5!")
label.setAlignment(Qt.AlignCenter)
label.setStyleSheet("font-size: 24px; color: blue; padding: 10px;")
label.setFixedHeight(50)
mainLayout.addWidget(label)

pushButtonLayout = QHBoxLayout()
mainLayout.addLayout(pushButtonLayout)

pushButtonRed = QPushButton("Blink Red!")
pushButtonRed.setStyleSheet("background-color: red; color: white; font-size: 24px; padding:10;")
pushButtonRed.setFixedSize(150,50)
def pushButtonRedClicked():
    label.setText("Blink Red!")
    label.setStyleSheet(" font-size: 24px;color: red; padding:10;")
    cmd ="redblink:5:100\n"
    cmdEncoded=cmd.encode()
    mySocket.sendto(cmdEncoded, (HOST,PORT))
    print('Sent '+cmd+' to HOST',HOST,PORT)
    try:
        response, server_address = mySocket.recvfrom(1024)
        print("Server response:", response.decode())
    except socket.timeout:
        print("No response received from server within 5 seconds")
pushButtonRed.clicked.connect(pushButtonRedClicked)
pushButtonLayout.addWidget(pushButtonRed)

pushButtonGreen = QPushButton("Blink Green!")
pushButtonGreen.setStyleSheet("background-color: green; color: white; font-size: 24px; padding:10;")
pushButtonGreen.setFixedSize(150,50)
def pushButtonGreenClicked():
    label.setText("Blink Green!")
    label.setStyleSheet(" font-size: 24px;color: green; padding:10;")
    cmd ="greenblink:5:100\n"
    cmdEncoded=cmd.encode()
    mySocket.sendto(cmdEncoded, (HOST,PORT))
    print('Sent '+cmd+' to HOST',HOST,PORT)
    try:
        response, server_address = mySocket.recvfrom(1024)
        print("Server response:", response.decode())
    except socket.timeout:
        print("No response received from server within 5 seconds")
    
pushButtonGreen.clicked.connect(pushButtonGreenClicked)
pushButtonLayout.addWidget(pushButtonGreen)

pushButtonBlue = QPushButton("Blink Blue!")
pushButtonBlue.setStyleSheet("background-color: blue; color: white; font-size: 24px; padding:10;")
pushButtonBlue.setFixedSize(150,50)
def pushButtonBlueClicked():
    label.setText("Blink Blue!")
    label.setStyleSheet(" font-size: 24px;color: blue; padding:10;")
    cmd ="blueblink:5:100\n"
    cmdEncoded=cmd.encode()
    mySocket.sendto(cmdEncoded, (HOST,PORT))
    print('Sent '+cmd+' to HOST',HOST,PORT)
    try:
        response, server_address = mySocket.recvfrom(1024)
        print("Server response:", response.decode())
    except socket.timeout:
        print("No response received from server within 5 seconds")
 
pushButtonBlue.clicked.connect(pushButtonBlueClicked)
pushButtonLayout.addWidget(pushButtonBlue)

toggleButtonLayout = QHBoxLayout()
mainLayout.addLayout(toggleButtonLayout)


toggleButtonRed = QPushButton("Toggle Red")
toggleButtonRed.setCheckable(True)
toggleButtonRed.setStyleSheet("background-color: red; color: white; font-size: 18px; padding:10;")
toggleButtonRed.setFixedSize(150,50)
def toggleRed(checked):
    if checked:
        label.setText("Red Toggle ON")
        label.setStyleSheet(" font-size: 24px;color: red; padding:10;")
        cmd="redOn\n"
        cmdEncoded=cmd.encode()
        mySocket.sendto(cmdEncoded, (HOST,PORT))
        print('Sent '+cmd+' to HOST',HOST,PORT)
        try:
            response, server_address = mySocket.recvfrom(1024)
            print("Server response:", response.decode())
        except socket.timeout:
            print("No response received from server within 5 seconds")
    if not checked:
        label.setText("Red Toggle OFF")
        label.setStyleSheet(" font-size: 24px;color: red; padding:10;")
        cmd="redOff\n"
        cmdEncoded=cmd.encode()
        mySocket.sendto(cmdEncoded, (HOST,PORT))
        print('Sent '+cmd+' to HOST',HOST,PORT)
        try:
            response, server_address = mySocket.recvfrom(1024)
            print("Server response:", response.decode())
        except socket.timeout:
            print("No response received from server within 5 seconds") 
        

toggleButtonRed.toggled.connect(toggleRed)
toggleButtonLayout.addWidget(toggleButtonRed)

toggleButtonGreen = QPushButton("Toggle Green")
toggleButtonGreen.setCheckable(True)
toggleButtonGreen.setStyleSheet("background-color: green; color: white; font-size: 18px; padding:10;")
toggleButtonGreen.setFixedSize(150,50)
def toggleGreen(checked):
    if checked:
        label.setText("Green Toggle ON")
        label.setStyleSheet(" font-size: 24px;color: green; padding:10;")
        cmd="greenOn\n"
        cmdEncoded=cmd.encode()
        mySocket.sendto(cmdEncoded, (HOST,PORT))
        print('Sent '+cmd+' to HOST',HOST,PORT)
        try:
            response, server_address = mySocket.recvfrom(1024)
            print("Server response:", response.decode())
        except socket.timeout:
            print("No response received from server within 5 seconds")
    if not checked:
        label.setText("Green Toggle OFF")
        label.setStyleSheet(" font-size: 24px;color: green; padding:10;")
        cmd="greenOff\n"
        cmdEncoded=cmd.encode()
        mySocket.sendto(cmdEncoded, (HOST,PORT))
        print('Sent '+cmd+' to HOST',HOST,PORT)
        try:
            response, server_address = mySocket.recvfrom(1024)
            print("Server response:", response.decode())
        except socket.timeout:
            print("No response received from server within 5 seconds") 
   
toggleButtonGreen.toggled.connect(toggleGreen)
toggleButtonLayout.addWidget(toggleButtonGreen)

toggleButtonBlue = QPushButton("Toggle Blue")
toggleButtonBlue.setCheckable(True)
toggleButtonBlue.setStyleSheet("background-color: blue; color: white; font-size: 18px; padding:10;")
toggleButtonBlue.setFixedSize(150,50)
def toggleBlue(checked):
    if checked:
        label.setText("Blue Toggle ON")
        label.setStyleSheet(" font-size: 24px;color: blue; padding:10;")
        cmd='blueOn\n'
        cmdEncoded=cmd.encode()
        mySocket.sendto(cmdEncoded, (HOST,PORT))
        print('Sent '+cmd+' to HOST',HOST,PORT)
        try:
            response, server_address = mySocket.recvfrom(1024)
            print("Server response:", response.decode())
        except socket.timeout:
            print("No response received from server within 5 seconds")
    if not checked:
        label.setText("Blue Toggle OFF")
        label.setStyleSheet(" font-size: 24px;color: blue; padding:10;")
        cmd="blueOff\n"
        cmdEncoded=cmd.encode()
        mySocket.sendto(cmdEncoded, (HOST,PORT))
        print('Sent '+cmd+' to HOST',HOST,PORT)
        try:
            response, server_address = mySocket.recvfrom(1024)
            print("Server response:", response.decode())
        except socket.timeout:
            print("No response received from server within 5 seconds") 
   
toggleButtonBlue.toggled.connect(toggleBlue)
toggleButtonLayout.addWidget(toggleButtonBlue)

mainLayout.addStretch()
window.show()
sys.exit(app.exec_())

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from PyQt5.QtWidgets import *

from PyQt5.QtCore import *

import sys

import socket

# Arduino’s IP address (from Arduino Serial Monitor)

HOST = "192.168.88.33" # Use Your Arduino's IP. It will print when

#You Run the Arduino Server Program

PORT = 12345 # Must match Arduino’s UDP port

# Create a UDP socket

mySocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

mySocket.settimeout(5.0) # 5 seconds timeout for responses

app = QApplication([])

window = QMainWindow()

window.setWindowTitle('Welcome to GUI World')

window.setGeometry(100,100,500,300)

widgetContainer = QWidget()

window.setCentralWidget(widgetContainer)

mainLayout = QVBoxLayout(widgetContainer)

label = QLabel("Welcome to PyQt5!")

label.setAlignment(Qt.AlignCenter)

label.setStyleSheet("font-size: 24px; color: blue; padding: 10px;")

label.setFixedHeight(50)

mainLayout.addWidget(label)

pushButtonLayout = QHBoxLayout()

mainLayout.addLayout(pushButtonLayout)

pushButtonRed = QPushButton("Blink Red!")

pushButtonRed.setStyleSheet("background-color: red; color: white; font-size: 24px; padding:10;")

pushButtonRed.setFixedSize(150,50)

def pushButtonRedClicked():

label.setText("Blink Red!")

label.setStyleSheet(" font-size: 24px;color: red; padding:10;")

cmd ="redblink:5:100\n"

cmdEncoded=cmd.encode()

mySocket.sendto(cmdEncoded, (HOST,PORT))

print('Sent '+cmd+' to HOST',HOST,PORT)

try:

response, server_address = mySocket.recvfrom(1024)

print("Server response:", response.decode())

except socket.timeout:

print("No response received from server within 5 seconds")

pushButtonRed.clicked.connect(pushButtonRedClicked)

pushButtonLayout.addWidget(pushButtonRed)

pushButtonGreen = QPushButton("Blink Green!")

pushButtonGreen.setStyleSheet("background-color: green; color: white; font-size: 24px; padding:10;")

pushButtonGreen.setFixedSize(150,50)

def pushButtonGreenClicked():

label.setText("Blink Green!")

label.setStyleSheet(" font-size: 24px;color: green; padding:10;")

cmd ="greenblink:5:100\n"

cmdEncoded=cmd.encode()

mySocket.sendto(cmdEncoded, (HOST,PORT))

print('Sent '+cmd+' to HOST',HOST,PORT)

try:

response, server_address = mySocket.recvfrom(1024)

print("Server response:", response.decode())

except socket.timeout:

print("No response received from server within 5 seconds")

pushButtonGreen.clicked.connect(pushButtonGreenClicked)

pushButtonLayout.addWidget(pushButtonGreen)

pushButtonBlue = QPushButton("Blink Blue!")

pushButtonBlue.setStyleSheet("background-color: blue; color: white; font-size: 24px; padding:10;")

pushButtonBlue.setFixedSize(150,50)

def pushButtonBlueClicked():

label.setText("Blink Blue!")

label.setStyleSheet(" font-size: 24px;color: blue; padding:10;")

cmd ="blueblink:5:100\n"

cmdEncoded=cmd.encode()

mySocket.sendto(cmdEncoded, (HOST,PORT))

print('Sent '+cmd+' to HOST',HOST,PORT)

try:

response, server_address = mySocket.recvfrom(1024)

print("Server response:", response.decode())

except socket.timeout:

print("No response received from server within 5 seconds")

pushButtonBlue.clicked.connect(pushButtonBlueClicked)

pushButtonLayout.addWidget(pushButtonBlue)

toggleButtonLayout = QHBoxLayout()

mainLayout.addLayout(toggleButtonLayout)

toggleButtonRed = QPushButton("Toggle Red")

toggleButtonRed.setCheckable(True)

toggleButtonRed.setStyleSheet("background-color: red; color: white; font-size: 18px; padding:10;")

toggleButtonRed.setFixedSize(150,50)

def toggleRed(checked):

if checked:

label.setText("Red Toggle ON")

label.setStyleSheet(" font-size: 24px;color: red; padding:10;")

cmd="redOn\n"

cmdEncoded=cmd.encode()

mySocket.sendto(cmdEncoded, (HOST,PORT))

print('Sent '+cmd+' to HOST',HOST,PORT)

try:

response, server_address = mySocket.recvfrom(1024)

print("Server response:", response.decode())

except socket.timeout:

print("No response received from server within 5 seconds")

if not checked:

label.setText("Red Toggle OFF")

label.setStyleSheet(" font-size: 24px;color: red; padding:10;")

cmd="redOff\n"

cmdEncoded=cmd.encode()

mySocket.sendto(cmdEncoded, (HOST,PORT))

print('Sent '+cmd+' to HOST',HOST,PORT)

try:

response, server_address = mySocket.recvfrom(1024)

print("Server response:", response.decode())

except socket.timeout:

print("No response received from server within 5 seconds")

toggleButtonRed.toggled.connect(toggleRed)

toggleButtonLayout.addWidget(toggleButtonRed)

toggleButtonGreen = QPushButton("Toggle Green")

toggleButtonGreen.setCheckable(True)

toggleButtonGreen.setStyleSheet("background-color: green; color: white; font-size: 18px; padding:10;")

toggleButtonGreen.setFixedSize(150,50)

def toggleGreen(checked):

if checked:

label.setText("Green Toggle ON")

label.setStyleSheet(" font-size: 24px;color: green; padding:10;")

cmd="greenOn\n"

cmdEncoded=cmd.encode()

mySocket.sendto(cmdEncoded, (HOST,PORT))

print('Sent '+cmd+' to HOST',HOST,PORT)

try:

response, server_address = mySocket.recvfrom(1024)

print("Server response:", response.decode())

except socket.timeout:

print("No response received from server within 5 seconds")

if not checked:

label.setText("Green Toggle OFF")

label.setStyleSheet(" font-size: 24px;color: green; padding:10;")

cmd="greenOff\n"

cmdEncoded=cmd.encode()

mySocket.sendto(cmdEncoded, (HOST,PORT))

print('Sent '+cmd+' to HOST',HOST,PORT)

try:

response, server_address = mySocket.recvfrom(1024)

print("Server response:", response.decode())

except socket.timeout:

print("No response received from server within 5 seconds")

toggleButtonGreen.toggled.connect(toggleGreen)

toggleButtonLayout.addWidget(toggleButtonGreen)

toggleButtonBlue = QPushButton("Toggle Blue")

toggleButtonBlue.setCheckable(True)

toggleButtonBlue.setStyleSheet("background-color: blue; color: white; font-size: 18px; padding:10;")

toggleButtonBlue.setFixedSize(150,50)

def toggleBlue(checked):

if checked:

label.setText("Blue Toggle ON")

label.setStyleSheet(" font-size: 24px;color: blue; padding:10;")

cmd='blueOn\n'

cmdEncoded=cmd.encode()

mySocket.sendto(cmdEncoded, (HOST,PORT))

print('Sent '+cmd+' to HOST',HOST,PORT)

try:

response, server_address = mySocket.recvfrom(1024)

print("Server response:", response.decode())

except socket.timeout:

print("No response received from server within 5 seconds")

if not checked:

label.setText("Blue Toggle OFF")

label.setStyleSheet(" font-size: 24px;color: blue; padding:10;")

cmd="blueOff\n"

cmdEncoded=cmd.encode()

mySocket.sendto(cmdEncoded, (HOST,PORT))

print('Sent '+cmd+' to HOST',HOST,PORT)

try:

response, server_address = mySocket.recvfrom(1024)

print("Server response:", response.decode())

except socket.timeout:

print("No response received from server within 5 seconds")

toggleButtonBlue.toggled.connect(toggleBlue)

toggleButtonLayout.addWidget(toggleButtonBlue)

mainLayout.addStretch()

window.show()

sys.exit(app.exec_())

Arduino, Python

Use PyQt5 to Create a Graphical User Interface for Arduino Project Over WiFi

May 22, 2025 admin

In this video lesson we introduce you to creating Graphical User Interfaces (GUI) to control your arduino project over WiFi using PyQt5. For this first introduction, we show you how to create the PyQt5 Widget on your PC using Python. Then your homework will be to control your arduino using the widget over WiFi. For your convenience, the code we developed in the lesson is presented below.

from PyQt5.QtWidgets import *
from PyQt5.QtCore import *
import sys

app = QApplication([])

window = QMainWindow()
window.setWindowTitle('Welcome to GUI World')
window.setGeometry(100,100,500,300)

widgetContainer = QWidget()
window.setCentralWidget(widgetContainer)
mainLayout = QVBoxLayout(widgetContainer)

label = QLabel("Welcome to PyQt5!")
label.setAlignment(Qt.AlignCenter)
label.setStyleSheet("font-size: 24px; color: blue; padding: 10px;")
label.setFixedHeight(50)
mainLayout.addWidget(label)

pushButtonLayout = QHBoxLayout()
mainLayout.addLayout(pushButtonLayout)

pushButtonRed = QPushButton("Blink Red!")
pushButtonRed.setStyleSheet("background-color: red; color: white; font-size: 24px; padding:10;")
pushButtonRed.setFixedSize(150,50)
def pushButtonRedClicked():
    label.setText("Blink Red!")
    label.setStyleSheet(" font-size: 24px;color: red; padding:10;")
pushButtonRed.clicked.connect(pushButtonRedClicked)
pushButtonLayout.addWidget(pushButtonRed)

pushButtonGreen = QPushButton("Blink Green!")
pushButtonGreen.setStyleSheet("background-color: green; color: white; font-size: 24px; padding:10;")
pushButtonGreen.setFixedSize(150,50)
def pushButtonGreenClicked():
    label.setText("Blink Green!")
    label.setStyleSheet(" font-size: 24px;color: green; padding:10;")
pushButtonGreen.clicked.connect(pushButtonGreenClicked)
pushButtonLayout.addWidget(pushButtonGreen)

pushButtonBlue = QPushButton("Blink Blue!")
pushButtonBlue.setStyleSheet("background-color: blue; color: white; font-size: 24px; padding:10;")
pushButtonBlue.setFixedSize(150,50)
def pushButtonBlueClicked():
    label.setText("Blink Blue!")
    label.setStyleSheet(" font-size: 24px;color: blue; padding:10;")
pushButtonBlue.clicked.connect(pushButtonBlueClicked)
pushButtonLayout.addWidget(pushButtonBlue)

toggleButtonLayout = QHBoxLayout()
mainLayout.addLayout(toggleButtonLayout)


toggleButtonRed = QPushButton("Toggle Red")
toggleButtonRed.setCheckable(True)
toggleButtonRed.setStyleSheet("background-color: red; color: white; font-size: 18px; padding:10;")
toggleButtonRed.setFixedSize(150,50)
def toggleRed(checked):
    if checked:
        label.setText("Red Toggle ON")
        label.setStyleSheet(" font-size: 24px;color: red; padding:10;")
        
    if not checked:
        label.setText("Red Toggle OFF")
        label.setStyleSheet(" font-size: 24px;color: red; padding:10;")

toggleButtonRed.toggled.connect(toggleRed)
toggleButtonLayout.addWidget(toggleButtonRed)

toggleButtonGreen = QPushButton("Toggle Green")
toggleButtonGreen.setCheckable(True)
toggleButtonGreen.setStyleSheet("background-color: green; color: white; font-size: 18px; padding:10;")
toggleButtonGreen.setFixedSize(150,50)
def toggleGreen(checked):
    if checked:
        label.setText("Green Toggle ON")
        label.setStyleSheet(" font-size: 24px;color: green; padding:10;")
        
    if not checked:
        label.setText("Green Toggle OFF")
        label.setStyleSheet(" font-size: 24px;color: green; padding:10;")

toggleButtonGreen.toggled.connect(toggleGreen)
toggleButtonLayout.addWidget(toggleButtonGreen)

toggleButtonBlue = QPushButton("Toggle Blue")
toggleButtonBlue.setCheckable(True)
toggleButtonBlue.setStyleSheet("background-color: blue; color: white; font-size: 18px; padding:10;")
toggleButtonBlue.setFixedSize(150,50)
def toggleBlue(checked):
    if checked:
        label.setText("Blue Toggle ON")
        label.setStyleSheet(" font-size: 24px;color: blue; padding:10;")
        
    if not checked:
        label.setText("Blue Toggle OFF")
        label.setStyleSheet(" font-size: 24px;color: bllue; padding:10;")

toggleButtonBlue.toggled.connect(toggleBlue)
toggleButtonLayout.addWidget(toggleButtonBlue)

mainLayout.addStretch()
window.show()
sys.exit(app.exec_())

100

101

102

103

104

105

from PyQt5.QtWidgets import *

from PyQt5.QtCore import *

import sys

app = QApplication([])

window = QMainWindow()

window.setWindowTitle('Welcome to GUI World')

window.setGeometry(100,100,500,300)

widgetContainer = QWidget()

window.setCentralWidget(widgetContainer)

mainLayout = QVBoxLayout(widgetContainer)

label = QLabel("Welcome to PyQt5!")

label.setAlignment(Qt.AlignCenter)

label.setStyleSheet("font-size: 24px; color: blue; padding: 10px;")

label.setFixedHeight(50)

mainLayout.addWidget(label)

pushButtonLayout = QHBoxLayout()

mainLayout.addLayout(pushButtonLayout)

pushButtonRed = QPushButton("Blink Red!")

pushButtonRed.setStyleSheet("background-color: red; color: white; font-size: 24px; padding:10;")

pushButtonRed.setFixedSize(150,50)

def pushButtonRedClicked():

label.setText("Blink Red!")

label.setStyleSheet(" font-size: 24px;color: red; padding:10;")

pushButtonRed.clicked.connect(pushButtonRedClicked)

pushButtonLayout.addWidget(pushButtonRed)

pushButtonGreen = QPushButton("Blink Green!")

pushButtonGreen.setStyleSheet("background-color: green; color: white; font-size: 24px; padding:10;")

pushButtonGreen.setFixedSize(150,50)

def pushButtonGreenClicked():

label.setText("Blink Green!")

label.setStyleSheet(" font-size: 24px;color: green; padding:10;")

pushButtonGreen.clicked.connect(pushButtonGreenClicked)

pushButtonLayout.addWidget(pushButtonGreen)

pushButtonBlue = QPushButton("Blink Blue!")

pushButtonBlue.setStyleSheet("background-color: blue; color: white; font-size: 24px; padding:10;")

pushButtonBlue.setFixedSize(150,50)

def pushButtonBlueClicked():

label.setText("Blink Blue!")

label.setStyleSheet(" font-size: 24px;color: blue; padding:10;")

pushButtonBlue.clicked.connect(pushButtonBlueClicked)

pushButtonLayout.addWidget(pushButtonBlue)

toggleButtonLayout = QHBoxLayout()

mainLayout.addLayout(toggleButtonLayout)

toggleButtonRed = QPushButton("Toggle Red")

toggleButtonRed.setCheckable(True)

toggleButtonRed.setStyleSheet("background-color: red; color: white; font-size: 18px; padding:10;")

toggleButtonRed.setFixedSize(150,50)

def toggleRed(checked):

if checked:

label.setText("Red Toggle ON")

label.setStyleSheet(" font-size: 24px;color: red; padding:10;")

if not checked:

label.setText("Red Toggle OFF")

label.setStyleSheet(" font-size: 24px;color: red; padding:10;")

toggleButtonRed.toggled.connect(toggleRed)

toggleButtonLayout.addWidget(toggleButtonRed)

toggleButtonGreen = QPushButton("Toggle Green")

toggleButtonGreen.setCheckable(True)

toggleButtonGreen.setStyleSheet("background-color: green; color: white; font-size: 18px; padding:10;")

toggleButtonGreen.setFixedSize(150,50)

def toggleGreen(checked):

if checked:

label.setText("Green Toggle ON")

label.setStyleSheet(" font-size: 24px;color: green; padding:10;")

if not checked:

label.setText("Green Toggle OFF")

label.setStyleSheet(" font-size: 24px;color: green; padding:10;")

toggleButtonGreen.toggled.connect(toggleGreen)

toggleButtonLayout.addWidget(toggleButtonGreen)

toggleButtonBlue = QPushButton("Toggle Blue")

toggleButtonBlue.setCheckable(True)

toggleButtonBlue.setStyleSheet("background-color: blue; color: white; font-size: 18px; padding:10;")

toggleButtonBlue.setFixedSize(150,50)

def toggleBlue(checked):

if checked:

label.setText("Blue Toggle ON")

label.setStyleSheet(" font-size: 24px;color: blue; padding:10;")

if not checked:

label.setText("Blue Toggle OFF")

label.setStyleSheet(" font-size: 24px;color: bllue; padding:10;")

toggleButtonBlue.toggled.connect(toggleBlue)

toggleButtonLayout.addWidget(toggleButtonBlue)

mainLayout.addStretch()

window.show()

sys.exit(app.exec_())

Arduino, Arduino with Python, Python

Improved Client Server Framework for Arduino

May 16, 2025 admin

In this lesson, we show an improved framework for creating a Client/Server connection between your Arduino and your desktop PC over WiFi. This will serve as the basis for our WiFi projects moving forward. On the arduino side, we have the following code to create the Server:

#include <WiFiS3.h>
#include "secrets.h"
WiFiUDP udp;
int PORT = 12345;
String myString;
String stringArray[10];
String response = "ACK";
void setup() {
  Serial.begin(9600);
  Serial.print("Connecting to ");
  Serial.println(mySSID);
  WiFi.begin(mySSID, myPASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi");
  Serial.println(WiFi.localIP());
  udp.begin(PORT);
  Serial.print("UDP Server started on port ");
  Serial.print(PORT);
  // put your setup code here, to run once:
}
void splitString() {
  int startIndex = 0;
  int indexCount = 0;
  int i;
  int j;
  myString = myString + ':';
  for (i = 0; i < myString.length(); i = i + 1) {
    if (myString[i] == ':') {
      stringArray[indexCount] = myString.substring(startIndex, i);
      indexCount = indexCount + 1;
      startIndex = i + 1;
    }
  }
  for (j = 0; j < indexCount; j = j + 1) {
    Serial.println(stringArray[j]);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  if (udp.parsePacket()) {
    myString = udp.readStringUntil('\n');
    Serial.println("Received : " + myString);
    udp.beginPacket(udp.remoteIP(), udp.remotePort());
    udp.print(response);
    udp.endPacket();
    Serial.println("SENT: " + response);
    splitString();
  }
}

#include <WiFiS3.h>

#include "secrets.h"

WiFiUDP udp;

int PORT = 12345;

String myString;

String stringArray[10];

String response = "ACK";

void setup() {

Serial.begin(9600);

Serial.print("Connecting to ");

Serial.println(mySSID);

WiFi.begin(mySSID, myPASS);

while (WiFi.status() != WL_CONNECTED) {

delay(100);

Serial.print(".");

}

Serial.println("\nConnected to WiFi");

Serial.println(WiFi.localIP());

udp.begin(PORT);

Serial.print("UDP Server started on port ");

Serial.print(PORT);

// put your setup code here, to run once:

}

void splitString() {

int startIndex = 0;

int indexCount = 0;

int i;

int j;

myString = myString + ':';

for (i = 0; i < myString.length(); i = i + 1) {

if (myString[i] == ':') {

stringArray[indexCount] = myString.substring(startIndex, i);

indexCount = indexCount + 1;

startIndex = i + 1;

}

for (j = 0; j < indexCount; j = j + 1) {

Serial.println(stringArray[j]);

}

void loop() {

// put your main code here, to run repeatedly:

if (udp.parsePacket()) {

myString = udp.readStringUntil('\n');

Serial.println("Received : " + myString);

udp.beginPacket(udp.remoteIP(), udp.remotePort());

udp.print(response);

udp.endPacket();

Serial.println("SENT: " + response);

splitString();

}

Remember, you must create a new tab, and include the following as your ‘secrets.h’ file

#define mySSID "YOUR WIFI NAME"
#define myPASS "YOUR WIFI PASSWORD"

1 2	#define mySSID "YOUR WIFI NAME" #define myPASS "YOUR WIFI PASSWORD"

And then, on the Desktop side, this will be your python ‘Client’ code:

import socket

# Arduino’s IP address (from Arduino Serial Monitor)
HOST = "192.168.88.33"  # Use Your Arduino's IP. It will print when
                        #You Run the Arduino Server Program
PORT = 12345            # Must match Arduino’s UDP port

# Create a UDP socket
mySocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
mySocket.settimeout(5.0)  # 5 seconds timeout for responses

print("UDP Client started. Enter Data (or 'quit' to exit).")

while True:
    # Prompt for Data
    myData = input("Enter Data String: ") 
    if myData.lower() == 'quit':  # Exit condition
        break
    # Send Data to the server
    myData=myData+'\n'
    myDataEncoded=myData.encode()
    mySocket.sendto(myDataEncoded, (HOST, PORT))
    print('Sent '+myData+' to HOST',HOST,PORT)

    # Try to get a response, skip on timeout
    try:
        response, server_address = mySocket.recvfrom(1024)
        print("Server response:", response.decode())
    except socket.timeout:
        print("No response received from server within 5 seconds")

# Close the socket
mySocket.close()
print("Socket closed")

import socket

# Arduino’s IP address (from Arduino Serial Monitor)

HOST = "192.168.88.33" # Use Your Arduino's IP. It will print when

#You Run the Arduino Server Program

PORT = 12345 # Must match Arduino’s UDP port

# Create a UDP socket

mySocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

mySocket.settimeout(5.0) # 5 seconds timeout for responses

print("UDP Client started. Enter Data (or 'quit' to exit).")

while True:

# Prompt for Data

myData = input("Enter Data String: ")

if myData.lower() == 'quit': # Exit condition

break

# Send Data to the server

myData=myData+'\n'

myDataEncoded=myData.encode()

mySocket.sendto(myDataEncoded, (HOST, PORT))

print('Sent '+myData+' to HOST',HOST,PORT)

# Try to get a response, skip on timeout

try:

response, server_address = mySocket.recvfrom(1024)

print("Server response:", response.decode())

except socket.timeout:

print("No response received from server within 5 seconds")

# Close the socket

mySocket.close()

print("Socket closed")

Arduino, Python

Parsing Comma Delimited Data Strings in Arduino

May 1, 2025 admin

In this lesson we are working on a client server connection. The Arduino is the server, and a python program on a desktop PC is the client. The objective is to control the color of an RGB LED from the client. The client will send data to the server as comma delimited string, like 255,0,255 for RGB. The challenge on the server side is to parse this data so we get integer values of:

R=255

G=0

B=255

In this video lesson we start by simply controlling two LED, a red and green one, from the python client. We then show how we can control an RGB LED by sending the data string from the client, and parsing it on the server side. For your convenience, we include the code here:

Server Side code for the Arduino:

#include <WiFiS3.h>
#include "secrets.h"
WiFiUDP udp;
int PORT = 12345;
char myPacket[255];
int dataLen;
String color;
String response;
int redPin = 8;
int greenPin = 9;
int R;
int G;
int B;
int firstComma;
int secondComma;
void setup() {
  Serial.begin(9600);
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  Serial.print("Connecting to ");
  Serial.println(SSID);
  WiFi.begin(SSID, PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi");
  Serial.println(WiFi.localIP());
  udp.begin(PORT);
  Serial.print("UDP Server started on port ");
  Serial.print(PORT);
  // put your setup code here, to run once:
}

void loop() {
  // put your main code here, to run repeatedly:
  if (udp.parsePacket()) {
    dataLen = udp.available();
    Serial.println(dataLen);
    udp.read(myPacket, 255);
    Serial.println(myPacket);
    myPacket[dataLen] = 0;
    Serial.println(myPacket);
    color = String(myPacket);
    color.trim();
    Serial.println("Received color: " + color);
    firstComma=color.indexOf(',',0);
    secondComma=color.indexOf(',',firstComma+1);
    R=color.substring(0,firstComma).toInt();
    G=color.substring(firstComma+1,secondComma).toInt();
    B=color.substring(secondComma+1).toInt();
    Serial.println(R);
    Serial.println(G);
    Serial.println(B);
    udp.beginPacket(udp.remoteIP(), udp.remotePort());
    udp.print(response);
    udp.endPacket();
    Serial.println("SENT: " + response);
  }
}

#include <WiFiS3.h>

#include "secrets.h"

WiFiUDP udp;

int PORT = 12345;

char myPacket[255];

int dataLen;

String color;

String response;

int redPin = 8;

int greenPin = 9;

int R;

int G;

int B;

int firstComma;

int secondComma;

void setup() {

Serial.begin(9600);

pinMode(redPin, OUTPUT);

pinMode(greenPin, OUTPUT);

Serial.print("Connecting to ");

Serial.println(SSID);

WiFi.begin(SSID, PASS);

while (WiFi.status() != WL_CONNECTED) {

delay(100);

Serial.print(".");

}

Serial.println("\nConnected to WiFi");

Serial.println(WiFi.localIP());

udp.begin(PORT);

Serial.print("UDP Server started on port ");

Serial.print(PORT);

// put your setup code here, to run once:

}

void loop() {

// put your main code here, to run repeatedly:

if (udp.parsePacket()) {

dataLen = udp.available();

Serial.println(dataLen);

udp.read(myPacket, 255);

Serial.println(myPacket);

myPacket[dataLen] = 0;

Serial.println(myPacket);

color = String(myPacket);

color.trim();

Serial.println("Received color: " + color);

firstComma=color.indexOf(',',0);

secondComma=color.indexOf(',',firstComma+1);

R=color.substring(0,firstComma).toInt();

G=color.substring(firstComma+1,secondComma).toInt();

B=color.substring(secondComma+1).toInt();

Serial.println(R);

Serial.println(G);

Serial.println(B);

udp.beginPacket(udp.remoteIP(), udp.remotePort());

udp.print(response);

udp.endPacket();

Serial.println("SENT: " + response);

}

The code above needs a ‘secrets.h’ file which includes your WiFi name and password. This is created in the IDE by choosing ‘Add Tab’. Call the new tab ‘secrets.h’, and edit the code below to include your WiFi name and passwords inside the quotes:

#define SSID "Your WiFi Name"
#define PASS "Your WiFi Password"

1 2	#define SSID "Your WiFi Name" #define PASS "Your WiFi Password"

Now, on the client side, this is our standard Python client:

import socket

# Arduino’s IP address (from Arduino Serial Monitor)
HOST = "192.168.88.77"  # Use Your Arduino's IP. It will print when
                        #You Run the Arduino Server Program
PORT = 12345            # Must match Arduino’s UDP port

# Create a UDP socket
mySocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
mySocket.settimeout(5.0)  # 5 seconds timeout for responses

print("UDP Client started. Enter a color (or 'quit' to exit).")

while True:
    # Prompt for a color
    #color = input("Enter a color: ").strip()  # Remove whitespace
    color = input("Enter a color: ") 
    if color.lower() == 'quit':  # Exit condition
        break

    # Send the color to the server
    sendColor=color.encode()
    mySocket.sendto(sendColor, (HOST, PORT))
    print('Sent '+color+' to HOST',HOST,PORT)

    # Try to get a response, skip on timeout
    try:
        response, server_address = mySocket.recvfrom(1024)
        print("Server response:", response.decode())
    except socket.timeout:
        print("No response received from server within 5 seconds")

# Close the socket
mySocket.close()
print("Socket closed")

import socket

# Arduino’s IP address (from Arduino Serial Monitor)

HOST = "192.168.88.77" # Use Your Arduino's IP. It will print when

#You Run the Arduino Server Program

PORT = 12345 # Must match Arduino’s UDP port

# Create a UDP socket

mySocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

mySocket.settimeout(5.0) # 5 seconds timeout for responses

print("UDP Client started. Enter a color (or 'quit' to exit).")

while True:

# Prompt for a color

#color = input("Enter a color: ").strip() # Remove whitespace

color = input("Enter a color: ")

if color.lower() == 'quit': # Exit condition

break

# Send the color to the server

sendColor=color.encode()

mySocket.sendto(sendColor, (HOST, PORT))

print('Sent '+color+' to HOST',HOST,PORT)

# Try to get a response, skip on timeout

try:

response, server_address = mySocket.recvfrom(1024)

print("Server response:", response.decode())

except socket.timeout:

print("No response received from server within 5 seconds")

# Close the socket

mySocket.close()

print("Socket closed")

With this code for creating a client and server, and then parsing comma delimited text, you can easily add the code needed to control the RGB LED color to the arduino program.

Arduino, Python

Create a Simple Client Server Connection Over WiFi to Connect Arduino to Python on the PC

April 24, 2025 admin

In this video lesson, we show how to create a simple Client/Server connection over WiFi. We connect the Arduino Uno R4 WiFi to Python running on the PC. The arduino is the server, and the PC Python program is the client. We show how to pass data from the PC to the Arduino, and then how to pass data from the Arduino back to the PC. With this simple framework, we can control Arduino projects from our desktop PC, and we can use the PC to display data being taken from the Arduino.

In this lesson we develop code for Arduino, and the code in Python. For your convenience, we present the code below.

On the Arduino Side, this is the code to create the ‘Server’.

#include <WiFiS3.h>
#include "secrets.h"
WiFiUDP udp;
int PORT = 12345;
char myPacket[255];
int dataLen;
String color;
String response;
void setup() {
  Serial.begin(9600);
  Serial.print("Connecting to ");
  Serial.println(SSID);
  WiFi.begin(SSID, PASS);
  while (WiFi.status() != WL_CONNECTED) {
    delay(100);
    Serial.print(".");
  }
  Serial.println("\nConnected to WiFi");
  Serial.println(WiFi.localIP());
  udp.begin(PORT);
  Serial.print("UDP Server started on port ");
  Serial.print(PORT);
  // put your setup code here, to run once:
}

void loop() {
  // put your main code here, to run repeatedly:
  if (udp.parsePacket()) {
    dataLen = udp.available();
    Serial.println(dataLen);
  udp.read(myPacket,255);
  Serial.println(myPacket);
  myPacket[dataLen]=0;
  Serial.println(myPacket);
  color=String(myPacket);
  color.trim();
  Serial.println("Received color: "+color);
  response ="Here is your "+color+" Marble";  
 udp.beginPacket(udp.remoteIP(), udp.remotePort());
 udp.print(response);
 udp.endPacket();
  Serial.println("SENT: "+response);
  }
}

#include <WiFiS3.h>

#include "secrets.h"

WiFiUDP udp;

int PORT = 12345;

char myPacket[255];

int dataLen;

String color;

String response;

void setup() {

Serial.begin(9600);

Serial.print("Connecting to ");

Serial.println(SSID);

WiFi.begin(SSID, PASS);

while (WiFi.status() != WL_CONNECTED) {

delay(100);

Serial.print(".");

}

Serial.println("\nConnected to WiFi");

Serial.println(WiFi.localIP());

udp.begin(PORT);

Serial.print("UDP Server started on port ");

Serial.print(PORT);

// put your setup code here, to run once:

}

void loop() {

// put your main code here, to run repeatedly:

if (udp.parsePacket()) {

dataLen = udp.available();

Serial.println(dataLen);

udp.read(myPacket,255);

Serial.println(myPacket);

myPacket[dataLen]=0;

Serial.println(myPacket);

color=String(myPacket);

color.trim();

Serial.println("Received color: "+color);

response ="Here is your "+color+" Marble";

udp.beginPacket(udp.remoteIP(), udp.remotePort());

udp.print(response);

udp.endPacket();

Serial.println("SENT: "+response);

}

You also need to add a tab to your program using the ‘Add Tab’ feature of the IDE. The program in the tab should be named secrets.h

Your secrets.h file should look like this:

#define SSID "Your WiFi Name"
#define PASS "your Wifi Password"

1 2	#define SSID "Your WiFi Name" #define PASS "your Wifi Password"

You can run the program above, and it should connect to your WiFi, and should print out the Arduino’s IP address. Make note of the IP address as it will be needed in the Client program below. On the PC side, this is the python code to create the client:

import socket

# Arduino’s IP address (from Arduino Serial Monitor)
HOST = "192.168.88.77"  # Use Your Arduino's IP. It will print when
                        #You Run the Arduino Server Program
PORT = 12345            # Must match Arduino’s UDP port

# Create a UDP socket
mySocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
mySocket.settimeout(5.0)  # 5 seconds timeout for responses

print("UDP Client started. Enter a color (or 'quit' to exit).")

while True:
    # Prompt for a color
    #color = input("Enter a color: ").strip()  # Remove whitespace
    color = input("Enter a color: ") 
    if color.lower() == 'quit':  # Exit condition
        break

    # Send the color to the server
    sendColor=color.encode()
    mySocket.sendto(sendColor, (HOST, PORT))
    print('Sent '+color+' to HOST',HOST,PORT)

    # Try to get a response, skip on timeout
    try:
        response, server_address = mySocket.recvfrom(1024)
        print("Server response:", response.decode())
    except socket.timeout:
        print("No response received from server within 5 seconds")

# Close the socket
mySocket.close()
print("Socket closed")

import socket

# Arduino’s IP address (from Arduino Serial Monitor)

HOST = "192.168.88.77" # Use Your Arduino's IP. It will print when

#You Run the Arduino Server Program

PORT = 12345 # Must match Arduino’s UDP port

# Create a UDP socket

mySocket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

mySocket.settimeout(5.0) # 5 seconds timeout for responses

print("UDP Client started. Enter a color (or 'quit' to exit).")

while True:

# Prompt for a color

#color = input("Enter a color: ").strip() # Remove whitespace

color = input("Enter a color: ")

if color.lower() == 'quit': # Exit condition

break

# Send the color to the server

sendColor=color.encode()

mySocket.sendto(sendColor, (HOST, PORT))

print('Sent '+color+' to HOST',HOST,PORT)

# Try to get a response, skip on timeout

try:

response, server_address = mySocket.recvfrom(1024)

print("Server response:", response.decode())

except socket.timeout:

print("No response received from server within 5 seconds")

# Close the socket

mySocket.close()

print("Socket closed")

Technology Tutorials

Category Archives: Arduino

PyQt5 Graphical User Interface for Control of Arduino Project Over WiFi

Use PyQt5 to Create a Graphical User Interface for Arduino Project Over WiFi

Improved Client Server Framework for Arduino

Parsing Comma Delimited Data Strings in Arduino

Create a Simple Client Server Connection Over WiFi to Connect Arduino to Python on the PC

Making The World a Better Place One High Tech Project at a Time. Enjoy!