Raspberry Pi Zero Switch Off by Button

I've a small and sweet Raspberry Pi zero . When I switch on my Raspy zero without a monitor or keyboard or LAN, I don't want switch off the pi directly by putting off the socket by the line. In fact this action can compromise the Raspy. You can be breaking the kernel, and the system can crash after that.

I've written a code that put the last pin in standby for a connection between the ground. When I connect the last pin with the ground, the code starts. The code is a simple sudo shutdown -h now

Buy your Raspberry Pi zero on Amazon

Go to GitHub and read the code (https://github.com/masteruan/Raspbery_switch).

import RPi.GPIO as GPIO

import time import os

buttonPin = 21

GPIO.setmode(GPIO.BCM)

GPIO.setup(buttonPin, GPIO.IN, pull_up_down=GPIO.PUD_UP)

last_state = True

input_state = True

while True:

input_state = GPIO.input(buttonPin)

if (not input_state): print("Shutdown")

os.system('sudo shutdown -h now')

time.sleep(0.05)

GPIO.cleanup()

Now is the moment to connect the pin. After the starting of Raspberry Pi, you can connect the last pin to ground.

You can read on screen, the command: sudo shudown-h now and the Raspberry Pi switch off.

Materials

Buy a switch on Amazon

Buy a tilt switch on Amazon

Now if you want start automatically the script do you modify the rc.local file. This file start when you switch on the Raspberry Pi

#!/bin/sh -e

# # rc.local # # This script is executed at the end of each multiuser runlevel. # Make sure that the script will "exit 0" on success or any other # value on error. # # In order to enable or disable this script just change the execution # bits. # # By default this script does nothing.

# Print the IP address _IP=$(hostname -I) || true if [ "$_IP" ]; then printf "My IP address is %s\n" "$_IP" fi

python /home/pi/Desktop/shutdown.py &

exit 0

Now you can mount a switch like in photo. I've mounted a tilt switch. When I turn upside down the Raspberry Pi, this switch off.