In this lesson we add slider bars to our PyQt widget. The slider bars will be used to control the color of an RGB LED, but this week we are simply getting the slider bars incorporated into the widget and then next week we will connect them to the Arduino. This is the schematic for the arduino we are using for the next few lessons:

When using the breadvolt, or any battery power supply on a breadboard project, do not turn the power supply on while the Arduino 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.
This is the code for the server on 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); } } } |
Remember you will need the secrets.h tab in order to have your WiFi login credentials.
1 2 | #define mySSID "YOUR WIFI NAME" #define myPASS "YOUR WIFI PASSWORD" |
The code below creates a PyQt widget with three slider bars. In this code, we are just demonstrating use of Slider Bars. Next week we will connect the Slider bars to the Arduino over WiFi for controlling RGB Color.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 | from PyQt5.QtWidgets import * from PyQt5.QtCore import * import sys import socket # Arduino’s IP address (from Arduino Serial Monitor) HOST = "192.168.88.120" # 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) redSlider = QSlider(Qt.Horizontal) redSlider.setMinimum(0) redSlider.setMaximum(100) redSlider.setValue(100) redSlider.setStyleSheet(""" QSlider::groove:horizontal {background: lightpink; height:20px;border-radius:5px;} QSlider::handle:horizontal {background: red; margin-top: -10px; margin-bottom: -10px ; height: 40;width: 20px;border-radius: 5px;} """) redSlider.setFixedHeight(50) def updateRedSlider(): global redStrength label.setText("Red Slider: "+str(redSlider.value())) label.setStyleSheet("font-size: 24px; color: red; padding:10;") redStrength = redSlider.value()/100*255 print("Red Strength: ",redStrength) redSlider.valueChanged.connect(updateRedSlider) mainLayout.addWidget(redSlider) greenSlider = QSlider(Qt.Horizontal) greenSlider.setMinimum(0) greenSlider.setMaximum(100) greenSlider.setValue(100) greenSlider.setStyleSheet(""" QSlider::groove:horizontal {background: lightgreen; height:20px;border-radius:5px;} QSlider::handle:horizontal {background: green; margin-top: -10px; margin-bottom: -10px ; height: 40;width: 20px;border-radius: 5px;} """) greenSlider.setFixedHeight(50) def updateGreenSlider(): global greenStrength label.setText("Green Slider: "+str(greenSlider.value())) label.setStyleSheet("font-size: 24px; color: green; padding:10;") greenStrength = greenSlider.value()/100*255 print("Red Strength: ",greenStrength) greenSlider.valueChanged.connect(updateGreenSlider) mainLayout.addWidget(greenSlider) blueSlider = QSlider(Qt.Horizontal) blueSlider.setMinimum(0) blueSlider.setMaximum(100) blueSlider.setValue(100) blueSlider.setStyleSheet(""" QSlider::groove:horizontal {background: lightblue; height:20px;border-radius:5px;} QSlider::handle:horizontal {background: blue; margin-top: -10px; margin-bottom: -10px ; height: 40;width: 20px;border-radius: 5px;} """) blueSlider.setFixedHeight(50) def updateBlueSlider(): global blueStrength label.setText("Blue Slider: "+str(blueSlider.value())) label.setStyleSheet("font-size: 24px; color: blue; padding:10;") blueStrength = blueSlider.value()/100*255 print("Blue Strength: ",blueStrength) blueSlider.valueChanged.connect(updateBlueSlider) mainLayout.addWidget(blueSlider) mainLayout.addStretch() window.show() sys.exit(app.exec_()) |