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In this example we create a GUI to set the value for our PWM example – Controlling the Brightness of an LED
Schematics
Parts
Name | Links |
Raspberry Pi 4 Model B Development Board | Aliexpress link |
Starter kit (leds , resistors) | SunFounder Super Starter Learning Kit V3.0 for Raspberry Pi |
Connecting wire | Aliexpress link |
Code
Save this as pwmgui.py
[codesyntax lang=”python”]
from Tkinter import * import RPi.GPIO as GPIO import time GPIO.setmode(GPIO.BCM) GPIO.setup(18, GPIO.OUT) pwm = GPIO.PWM(18, 500) pwm.start(100) class App: def __init__(self, master): frame = Frame(master) frame.pack() scale = Scale(frame, from_=0, to=100, orient=HORIZONTAL, command=self.update) scale.grid(row=0) def update(self, duty): pwm.ChangeDutyCycle(float(duty)) root = Tk() root.wm_title('PWM Example') app = App(root) root.geometry("200x50+0+0") root.mainloop()
[/codesyntax]
Testing
Run the following by the typing in
sudo python pwmgui.py