Edit: Breadboard, schematic, and code updated.

I accidentally fried my Pi by shorting it out through the GPIO pins, so I figured it would be a good idea to ask for some help before trying my current breadboard layout with my new Pi.

I have a Raspberry Pi 3 B+ and have connected it to these 2 breadboards: Schematic

This is what the breadboard layout looks like IRL:

Essentially, I want to have these 6 buttons cause the LEDs to light up and for additional code to run when they're pressed.

Using this resource, I wrote a script in Python 3 to handle inputs from the pins I wired the switches to:

import RPi.GPIO as GPIO
import time


#Buttons 1-6
GPIO.setup(4, GPIO.IN, pull_up_down=GPIO.PUD_UP) #Button #1
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(27, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(22, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(5, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(6, GPIO.IN, pull_up_down=GPIO.PUD_UP) #Button 6

#LEDs 1-6
GPIO.setup(18, GPIO.OUT) #LED #1
GPIO.setup(23, GPIO.OUT)
GPIO.setup(24, GPIO.OUT)
GPIO.setup(25, GPIO.OUT)
GPIO.setup(12, GPIO.OUT)
GPIO.setup(16, GPIO.OUT) #LED #6

while True:
    input_state_1 = GPIO.input(4)
    input_state_2 = GPIO.input(17)
    input_state_3 = GPIO.input(27)
    input_state_4 = GPIO.input(22)
    input_state_5 = GPIO.input(5)
    input_state_6 = GPIO.input(6)

    if input_state_1 == False: #if Button #1 is pressed
        print('Button #1 Pressed')
        GPIO.output(18, GPIO.HIGH) #turn on LED #1
        GPIO.output(18, GPIO.LOW) #turn off LED #1
    if input_state_2 == False:
        print('Button #2 Pressed')
        GPIO.output(23, GPIO.HIGH) 
        GPIO.output(23, GPIO.LOW)
    if input_state_3 == False:
        print('Button #3 Pressed')
        GPIO.output(24, GPIO.HIGH)
        GPIO.output(24, GPIO.LOW)
    if input_state_4 == False:
        print('Button #4 Pressed')
        GPIO.output(25, GPIO.HIGH)
        GPIO.output(25, GPIO.LOW)
    if input_state_5 == False:
        print('Button #5 Pressed')
        GPIO.output(12, GPIO.HIGH)
        GPIO.output(12, GPIO.LOW)
    if input_state_6 == False:
        print('Button #6 Pressed')
        GPIO.output(16, GPIO.HIGH) #turn on LED #6
        GPIO.output(16, GPIO.LOW) #turn off LED #6



I guess what I'm wondering currently is: Does the breadboard layout look correct for this application, and does the code look correct? Can multiple LEDs and switches share the same Ground pin? Do I need to set up Ground pins in Python?

  • Personally I don’t like this method of combining leds and buttons on inputs, Why not have 6 buttons connected to 6 GPIO inputs and 6 leds connected to 6 GPIO outputs then control with software. – CoderMike Sep 14 '18 at 6:56
  • @CoderMike - I've updated the picture and code based on your suggestion -- I hope I understood what you were saying correctly – Rudy Sep 14 '18 at 8:03
  • Difficult to tell from the photo - are each led and resistor connected to GND and a GPIO output? Are each button connected to GND and a GPIO input? I tend to add a resistor to the GND used for input - just incase. Add a time.sleep(0.1) to the end of your while true loop (avoids intensive loop). – CoderMike Sep 14 '18 at 8:55
  • I believe yes and yes. I've updated the code as well to add a 0.1s sleep at the end of the loop. – Rudy Sep 14 '18 at 9:08
  • All seems ok to me – CoderMike Sep 14 '18 at 9:21

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