Showing content from https://cdn.sparkfun.com/assets/learn_tutorials/1/1/7/1/safe_shutdown_Pi.py below:
# safe_shutdown_Pi.py # # ----------------------------------------------------------------------------- # Raspberry Pi Safe Shutdown Python Script # ----------------------------------------------------------------------------- # WRITTEN BY: Ho Yun "Bobby" Chan # @ SparkFun Electronics # DATE: 3/31/2020 # # Based on code from the following blog and tutorials: # # Kevin Godden # https://www.ridgesolutions.ie/index.php/2013/02/22/raspberry-pi-restart-shutdown-your-pi-from-python-code/ # # Pete Lewis # https://learn.sparkfun.com/tutorials/raspberry-pi-stand-alone-programmer#resources-and-going-further # # Shawn Hymel # https://learn.sparkfun.com/tutorials/python-programming-tutorial-getting-started-with-the-raspberry-pi/experiment-1-digital-input-and-output # # ==================== DESCRIPTION ==================== # # This python script takes advantage of the Qwiic pHat v2.0's # built-in general purpose button to safely reboot/shutdown you Pi: # # 1.) If you press the button momentarily, the Pi will shutdown. # # ========== TUTORIAL ========== # For more information on running this script on startup, # check out the associated tutorial to adjust your "rc.local" file: # # https://learn.sparkfun.com/tutorials/raspberry-pi-safe-reboot-and-shutdown-button # # ========== PRODUCTS THAT USE THIS CODE ========== # # Feel like supporting our work? Buy a board from SparkFun! # # Qwiic pHAT v2.0 # https://www.sparkfun.com/products/15945 # # You can also use any button but you would need to wire it up # instead of stacking the pHAT on your Pi. # # LICENSE: This code is released under the MIT License (http://opensource.org/licenses/MIT) # # Distributed as-is; no warranty is given # # ----------------------------------------------------------------------------- import time import RPi.GPIO as GPIO # Pin definition shutdown_pin = 17 # Suppress warnings GPIO.setwarnings(False) # Use "GPIO" pin numbering GPIO.setmode(GPIO.BCM) # Use built-in internal pullup resistor so the pin is not floating # if using a momentary push button without a resistor. #GPIO.setup(shutdown_pin, GPIO.IN, pull_up_down=GPIO.PUD_UP) # Use Qwiic pHAT's pullup resistor so that the pin is not floating GPIO.setup(shutdown_pin, GPIO.IN) # modular function to shutdown Pi def shut_down(): print("shutting down") command = "/usr/bin/sudo /sbin/shutdown -h now" import subprocess process = subprocess.Popen(command.split(), stdout=subprocess.PIPE) output = process.communicate()[0] print(output) # Check button if we want to shutdown the Pi safely while True: #short delay, otherwise this code will take up a lot of the Pi's processing power time.sleep(0.5) # For troubleshooting, uncomment this line to output buton status on command line #print('GPIO state is = ', GPIO.input(shutdown_pin)) if GPIO.input(shutdown_pin)== False: shut_down()
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