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;
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:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 | #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.
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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 | 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_()) |