wecker/arcade-button-wiring.md

Arcade Button Wiring - Pi 4

Components

• Arcade Button 33mm illuminated (bastelgarage.ch)
• Raspberry Pi 4 Model B

GPIO Header Pinout

    3.3V  (1)  (2)  5V
    GPIO 2  (3)  (4)  5V
    GPIO 3  (5)  (6)  GND
    GPIO 4  (7)  (8)  GPIO 14
       GND  (9)  (10) GPIO 15
   GPIO 17 (11) (12) GPIO 18
   GPIO 27 (13) (14) GND        ← LED
       GND (15) (16) GPIO 23
       ...

Circuit (without transistor)

LED (GPIO controlled)

    3.3V (Pin 1) ─── LED + (from button)
                        │
                       LED - 
                        │
    GPIO 27 (Pin 13) ───┘

Button

    GPIO 17 (Pin 11) ─── Button Contact 1
                          Button Contact 2 ─── GND (Pin 6)

Logic

GPIO 27	LED
HIGH	OFF
LOW	ON

LED Specs (resistor already included)

• Operating voltage: 5V to 12V
• At 3.3V: slightly less bright, but works

Next Steps

1. Verify wiring
2. Python script for testing:

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM)

# LED on GPIO 27
GPIO.setup(27, GPIO.OUT)

# Button on GPIO 17
GPIO.setup(17, GPIO.IN, pull_up_down=GPIO.PUD_UP)

try:
    while True:
        if GPIO.input(17) == False:  # Button pressed
            GPIO.output(27, GPIO.LOW)  # LED ON
        else:
            GPIO.output(27, GPIO.HIGH)  # LED OFF
        time.sleep(0.1)
except KeyboardInterrupt:
    GPIO.cleanup()