I am able to create a shutdown (and reboot) button for a plain Raspi harnassing the fact, that shorting Pin 5 to GND will reboot the Pi if shutdown.
However, when adding the HifiBerry HAT things become more complicated, as Pin 5 is used for I2C and as stated by HiFiBerry, some other GPIO-Pins are used as well.
Now to my question: Will the following curcuit work with the Amp+ HAT?
In the shutdown script I would be monitoring Pin 13 for LOW state and send
sudo shutdown -h now.
#!/usr/bin/python # -*- coding: UTF-8 -*- """shutdown script for Raspberry Pi watch LOW level on pin 13 to enter sleep mode status led on pin 15: ON = ready, BLINK = confirm button """ import RPi.GPIO as GPIO import os import time # use the pin number as on the raspi board GPIO.setmode(GPIO.BOARD) # set pin 15 as output and HIGH, pin 13 is input GPIO.setup(15, GPIO.OUT) GPIO.output(15, True) GPIO.setup(13, GPIO.IN) # start the loop for every .5 seconds, waiting for LOW on pin 13 # then 2 short flashes with led to confirm and shutdown to sleep mode while True: if not GPIO.input(13): GPIO.output(15, False) time.sleep(.1) GPIO.output(15, True) time.sleep(.1) GPIO.output(15, False) time.sleep(.1) GPIO.output(15, True) os.system("sudo shutdown -h now") time.sleep(.5)
Will currents drawn from Pin 5 influence the function of the HAT in this setting?