Multiple Inputs through GPIO

Question

I am currently trying to create a program that does something each time a button is pushed, it seems simple but for me this has been very difficult to acomplish. I am on python 2.7 (but I can go to 3 if you need me too) and I am using a pull-up-resistor setup.

The yellow wires are the pins (22, 23, and 24). The orange is positive 3.3V going to the 10K resistors. The green is ground.

I tried this code below but it simply returns, "Pin 24 is true" continuously and the buttons do nothing.

    import os, RPi.GPIO as GPIO
    from time import sleep

    GPIO.setmode(GPIO.BCM)
    GPIO.setup(23,GPIO.IN)
    GPIO.setup(24,GPIO.IN)
    GPIO.setup(25,GPIO.IN)

    while True:
       if(GPIO.input(23) == False):
          print ("Pin 23 is true")
          # do stuff based on pin 25 here
       elif(GPIO.input(24) == True):
          print ("Pin 24 is true")
          # do stuff based on pin 18 here
       elif(GPIO.input(25) == False):
          print ("Pin 25 is true")
          # and again for pin 22

Any help is much appreciated!

Thanks, Cody

Answer 1

GPIO.input() returns either GPIO.HIGH or GPIO.LOW, so it will never be equal to False.

Your check should be something like this:

if(GPIO.input(23) == GPIO.LOW):
    print ("Pin 23 button is pressed")
elif(GPIO.input(24) == GPIO.LOW):
    print ("Pin 24 button is pressed")
elif(GPIO.input(25) == GPIO.LOW):
    print ("Pin 25 button is pressed")

Be aware that by using elif if the first button is pressed the second and third buttons will never be detected as pressed until the first is released.

Answer 2

Which of those photos is actually your setup?

In the second photo, the colors on the resistors seems to be Brown, Black, Black which would mean 10 Ohms rather than Brown, Black, Orange which would be 10 KOhms. I think you really want 10 K resistors in there.

Your GPIO might not be able to pull that to a low. Could you verify?