Basic Python GPIO GUI example

In this example we will create a gui to switch on and off the LED that we used in the PWM example – Controlling the Brightness of an LED

Here is a reminder of the schematics

Code

Save the following as gpiogui.py

[codesyntax lang=”python”]

from Tkinter import *
import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.OUT)

class App:
	def __init__(self, master):
		frame = Frame(master)
		frame.pack()
		self.check_var = BooleanVar()
		check = Checkbutton(frame, text='Pin 18',
			command=self.update,
			variable=self.check_var, onvalue=True, offvalue=False)
		check.grid(row=1)
		
	def update(self):
		GPIO.output(18, self.check_var.get())
		
root = Tk()
root.wm_title('GPIO GUI Example')
app = App(root)
root.geometry("200x50+0+0")
root.mainloop()

[/codesyntax]

Testing

Run from the command line by typing in

sudo python gpiogui.py