Raspberry PI Button Control Code

Buttons are simple switch mechanisms for controlling some aspect of a machine or a process. Buttons can be pressed or released. You can always ask the state of a button. You can connect multiple buttons to your microcontroller, but do not forget to add them to your programcode. Buttons use digital pins which are special microcontroller pins with HIGH or LOW states. This depends if the button is pressed or not.

raspberry pi with button
Figure 1 - Raspberry PI with Button

Required hardware

  • Raspberry PI
  • Button
  • Resistor 1kΩ

Source code to install on controller

#!/usr/bin/python
import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.IN)

prev_input = GPIO.input(17)

mode = input('Please choose the mode (1=Raising, 2=Falling, 3=Change): ')

while True:

	input_state = GPIO.input(17)

	if mode == 1:
		if input_state != prev_input:
			if input_state == 1:
				print('Button pressed')
	if mode == 2:
		if input_state != prev_input:
			if input_state == 0:
				print('Button pressed')			
				
	if mode == 3:
		if input_state != prev_input:
			print('Button pressed')
			
	prev_input = input_state
	time.sleep(0.2)

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