Tag Archives: LED

Simple Client Server Project for the Raspberry Pi Pico W

February 25, 2025 admin

In this video lesson we demonstrate a simple client server project on the Raspberry Pi Pico W. The Pico is configures as the server, and your desktop pc or laptop is configures to be the client. You will be running python on your PC. The project requests the user on the PC to specify a desired color. The color is then sent to the Pico, the Server. Then the Pico sets that color to ‘ON’. The pi pico is powered by a breadboard power bank, and there is no need for any connections to the pico. You can pick up the breadBoard Power Bank HERE [Affiliate Link]. Below is the schematic for the Server Side of the project:

Schematic for Circuit to Demonstrate a Client Server Example on Pi Pico

For your convenience, this is the code we developed in the video

import network
import usocket as socket
import secrets
import time

greenLED=machine.Pin(18,machine.Pin.OUT)
yellowLED=machine.Pin(19,machine.Pin.OUT)
redLED=machine.Pin(20,machine.Pin.OUT)
# Set up WiFi connection
wlan = network.WLAN(network.STA_IF)
wlan.active(True)
print(secrets.SSID,secrets.PASSWORD)
wlan.connect(secrets.SSID,secrets.PASSWORD)

# Wait for connection
while not wlan.isconnected():
    time.sleep(1)
print("Connection Completed")
print('WiFi connected')
print(wlan.ifconfig())

# Set up UDP server
server_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
server_socket.bind((wlan.ifconfig()[0], 12345))
print("Server is Up and Listening")
print(wlan.ifconfig()[0])

while True:
    print('Waiting for a request from the client...')
    # Receive request from client
    color, client_address = server_socket.recvfrom(1024)
    color=color.decode()
    print("Client Request:",color)
    print("FROM CLIENT",client_address)
    
    if (color=="green"):
        greenLED.on()
        yellowLED.off()
        redLED.off()
    if (color=="yellow"):
        greenLED.off()
        yellowLED.on()
        redLED.off()
    if (color=="red"):
        greenLED.off()
        yellowLED.off()
        redLED.on()
    if (color=="off"):
        greenLED.off()
        yellowLED.off()
        redLED.off()
    
    # Send data to client
    data="LED "+color+" executed"
    server_socket.sendto(data.encode(), client_address)
    print(f'Sent data to {client_address}')
    
    # Optional: Pause for a short period to prevent overwhelming the client
    time.sleep(1)

import network

import usocket as socket

import secrets

import time

greenLED=machine.Pin(18,machine.Pin.OUT)

yellowLED=machine.Pin(19,machine.Pin.OUT)

redLED=machine.Pin(20,machine.Pin.OUT)

# Set up WiFi connection

wlan = network.WLAN(network.STA_IF)

wlan.active(True)

print(secrets.SSID,secrets.PASSWORD)

wlan.connect(secrets.SSID,secrets.PASSWORD)

# Wait for connection

while not wlan.isconnected():

time.sleep(1)

print("Connection Completed")

print('WiFi connected')

print(wlan.ifconfig())

# Set up UDP server

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

server_socket.bind((wlan.ifconfig()[0], 12345))

print("Server is Up and Listening")

print(wlan.ifconfig()[0])

while True:

print('Waiting for a request from the client...')

# Receive request from client

color, client_address = server_socket.recvfrom(1024)

color=color.decode()

print("Client Request:",color)

print("FROM CLIENT",client_address)

if (color=="green"):

greenLED.on()

yellowLED.off()

redLED.off()

if (color=="yellow"):

greenLED.off()

yellowLED.on()

redLED.off()

if (color=="red"):

greenLED.off()

yellowLED.off()

redLED.on()

if (color=="off"):

greenLED.off()

yellowLED.off()

redLED.off()

# Send data to client

data="LED "+color+" executed"

server_socket.sendto(data.encode(), client_address)

print(f'Sent data to {client_address}')

# Optional: Pause for a short period to prevent overwhelming the client

time.sleep(1)

Remember you must create a secrets.py file, and save it on the Pi Pico in the lib folder. You need to specify YOUR WiFi name and password in the file.

SSID="YOUR WIFI NAME"
PASSWORD="YOUR WIFI PASSWORD"

1 2	SSID="YOUR WIFI NAME" PASSWORD="YOUR WIFI PASSWORD"

And finally, here is the code to run on the client side on your PC

import socket
import time

# Set up UDP client
client_socket = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
server_address = ('192.168.88.71', 12345)  # Adjust IP address and port as needed

while True:
    # Send request to the server
    myColor=input("Please Input Your Color (Green, Yellow, Red, Off )")
    myColor=myColor.lower()
    client_socket.sendto(myColor.encode(), server_address)
    
    # Receive data from the server
    data, addr = client_socket.recvfrom(1024)
    print('Received data:', data.decode())

import socket

import time

# Set up UDP client

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

server_address = ('192.168.88.71', 12345) # Adjust IP address and port as needed

while True:

# Send request to the server

myColor=input("Please Input Your Color (Green, Yellow, Red, Off )")

myColor=myColor.lower()

client_socket.sendto(myColor.encode(), server_address)

# Receive data from the server

data, addr = client_socket.recvfrom(1024)

print('Received data:', data.decode())

Arduino

Create a Bouncing Pixel on the Arduino Uno R4 WiFi LED Matrix

August 8, 2024 admin

In this video lesson we create a bouncing pixel on the Arduino Uno R4 LED Matrix. For your convenience we include the code developed in the video below.

#include "Arduino_LED_Matrix.h"
ArduinoLEDMatrix matrix;

int br=115200;
int dt=50;
int xPos=3;
int yPos=2;
int deltaX=1;
int deltaY=1;

int i;
int j;

byte frame[8][12];

void setup() {
  // put your setup code here, to run once:
Serial.begin(br);
matrix.begin();
}
void loop() {
  // put your main code here, to run repeatedly:
for ( i=0;i<=11;i=i+1){
  for (j=0;j<=7;j=j+1){
    frame[j][i]=0;
    if (i==xPos && j==yPos){
      frame[j][i]=1;
    }
  }
}
matrix.renderBitmap(frame,8,12);
if (xPos>=11 || xPos<=0){
  deltaX=-deltaX;
}
if (yPos>=7 || yPos<=0){
  deltaY=-deltaY;
}
xPos=xPos+deltaX;
yPos=yPos+deltaY;
delay(dt);
}

#include "Arduino_LED_Matrix.h"

ArduinoLEDMatrix matrix;

int br=115200;

int dt=50;

int xPos=3;

int yPos=2;

int deltaX=1;

int deltaY=1;

int i;

int j;

byte frame[8][12];

void setup() {

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

Serial.begin(br);

matrix.begin();

}

void loop() {

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

for ( i=0;i<=11;i=i+1){

for (j=0;j<=7;j=j+1){

frame[j][i]=0;

if (i==xPos && j==yPos){

frame[j][i]=1;

}

matrix.renderBitmap(frame,8,12);

if (xPos>=11 || xPos<=0){

deltaX=-deltaX;

}

if (yPos>=7 || yPos<=0){

deltaY=-deltaY;

}

xPos=xPos+deltaX;

yPos=yPos+deltaY;

delay(dt);

}

MicroPython, Raspberry Pi Pico

MicroPython MultiCore Programming on the Raspberry Pi Pico Using Threading

May 7, 2024 admin

In this video I show how to use both cores on the Raspberry Pi Pico W. We will explore an example using threading where we will operate 2 LED and a servo.

from machine import Pin
import time
import _thread
import SERVO

greenPin=14
redPin=15
servoPin=17

LED=""

redLED=Pin(redPin,Pin.OUT)
greenLED=Pin(greenPin,Pin.OUT)

delOn=.1
delOff=.1
myServo=SERVO.servo(servoPin)
running =True

def othCore(del1,del2):
    global LED
    while True:
        if LED=="RED":
            redLED.value(1)
            time.sleep(del1)
            redLED.value(0)
            time.sleep(del2)
        if LED=="GREEN":
            greenLED.value(1)
            time.sleep(del1)
            greenLED.value(0)
            time.sleep(del2)
_thread.start_new_thread(othCore,(delOn,delOff))
time.sleep(.25)
while True:
    LED="RED"
    for i in range(0,180,1):
        myServo.pos(i)
        time.sleep(.01)
    LED="GREEN"
    for i in range(180,0,-1):
        myServo.pos(i)
        time.sleep(.01)

from machine import Pin

import time

import _thread

import SERVO

greenPin=14

redPin=15

servoPin=17

LED=""

redLED=Pin(redPin,Pin.OUT)

greenLED=Pin(greenPin,Pin.OUT)

delOn=.1

delOff=.1

myServo=SERVO.servo(servoPin)

running =True

def othCore(del1,del2):

global LED

while True:

if LED=="RED":

redLED.value(1)

time.sleep(del1)

redLED.value(0)

time.sleep(del2)

if LED=="GREEN":

greenLED.value(1)

time.sleep(del1)

greenLED.value(0)

time.sleep(del2)

_thread.start_new_thread(othCore,(delOn,delOff))

time.sleep(.25)

while True:

LED="RED"

for i in range(0,180,1):

myServo.pos(i)

time.sleep(.01)

LED="GREEN"

for i in range(180,0,-1):

myServo.pos(i)

time.sleep(.01)

Raspberry Pi

Create a Dimmable LED with a Potentiometer on the Raspberry Pi

June 23, 2022 admin

In this video lesson, we show how to create a dimmable LED on the raspberry pi using a potentiometer. Below is the schematic of the circuit we will be using.

Then we used the following code to read values through the ADC0834 analog to digital chip, and then apply a PWM signal to control the brightness of the LED.

import RPi.GPIO as GPIO
import ADC0834
import time

GPIO.setmode(GPIO.BCM)

LEDPin=23
GPIO.setup(LEDPin,GPIO.OUT)
myPWM=GPIO.PWM(LEDPin,1000)
myPWM.start(0)
ADC0834.setup()
try:
    while True:
        analogVal=ADC0834.getResult(0)
        print('Raw= ',analogVal, 'Vol= ', analogVal/255*5)
        DC=analogVal*100/255
        myPWM.ChangeDutyCycle(DC)
        time.sleep(.2)
        
except KeyboardInterrupt:
    GPIO.cleanup()
    print('GPIO Good to Go')

import RPi.GPIO as GPIO

import ADC0834

import time

GPIO.setmode(GPIO.BCM)

LEDPin=23

GPIO.setup(LEDPin,GPIO.OUT)

myPWM=GPIO.PWM(LEDPin,1000)

myPWM.start(0)

ADC0834.setup()

try:

while True:

analogVal=ADC0834.getResult(0)

print('Raw= ',analogVal, 'Vol= ', analogVal/255*5)

DC=analogVal*100/255

myPWM.ChangeDutyCycle(DC)

time.sleep(.2)

except KeyboardInterrupt:

GPIO.cleanup()

print('GPIO Good to Go')

Arduino with Python, Python

Using an Arduino with Python LESSON 11: Controlling an LED from Python

March 22, 2022 admin

In this video lesson, we show how to control an LED using python. Python sends commands to arduino, which then controls the LED. We also create a vPython visual, where the ‘Virtual’ LED mimics the behavior of the real LED. This a really cool demonstration and hope you enjoy it. I include below the code we develop in the video. On the arduino side we end up with the following:

int redPin=11;
int greenPin=10;
int bluePin=9;
int redVal=255;
int greenVal=255;
int blueVal=255;
String cmd;
void setup() {
  // put your setup code here, to run once:
Serial.begin(115200);
pinMode(redPin,OUTPUT);
pinMode(greenPin,OUTPUT);
pinMode(bluePin,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  while(Serial.available()==0){
  }
redVal=Serial.readStringUntil(':').toInt();
greenVal=Serial.readStringUntil(':').toInt();
blueVal=Serial.readStringUntil('\r').toInt();

analogWrite(redPin,redVal);
analogWrite(greenPin,greenVal);
analogWrite(bluePin,blueVal);

}

int redPin=11;

int greenPin=10;

int bluePin=9;

int redVal=255;

int greenVal=255;

int blueVal=255;

String cmd;

void setup() {

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

Serial.begin(115200);

pinMode(redPin,OUTPUT);

pinMode(greenPin,OUTPUT);

pinMode(bluePin,OUTPUT);

}

void loop() {

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

while(Serial.available()==0){

}

redVal=Serial.readStringUntil(':').toInt();

greenVal=Serial.readStringUntil(':').toInt();

blueVal=Serial.readStringUntil('\r').toInt();

analogWrite(redPin,redVal);

analogWrite(greenPin,greenVal);

analogWrite(bluePin,blueVal);

}

And on the python side we have:

import serial
from vpython import *

arduinoData=serial.Serial('com3',115200)

myOrb=sphere(color=color.black,radius=1)

while True:
    myCmd=input('Please Input Your Color R:G:B 0-255 ')
    myCmd=myCmd+'\r'
    arduinoData.write(myCmd.encode())
    myColor=myCmd.split(':')
    red=int(myColor[0])
    green=int(myColor[1])
    blue=int(myColor[2])
    myOrb.color=vector(red/255,green/255,blue/255)

import serial

from vpython import *

arduinoData=serial.Serial('com3',115200)

myOrb=sphere(color=color.black,radius=1)

while True:

myCmd=input('Please Input Your Color R:G:B 0-255 ')

myCmd=myCmd+'\r'

arduinoData.write(myCmd.encode())

myColor=myCmd.split(':')

red=int(myColor[0])

green=int(myColor[1])

blue=int(myColor[2])

myOrb.color=vector(red/255,green/255,blue/255)

Technology Tutorials

Tag Archives: LED

Simple Client Server Project for the Raspberry Pi Pico W

Create a Bouncing Pixel on the Arduino Uno R4 WiFi LED Matrix

MicroPython MultiCore Programming on the Raspberry Pi Pico Using Threading

Create a Dimmable LED with a Potentiometer on the Raspberry Pi

Using an Arduino with Python LESSON 11: Controlling an LED from Python

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