Why does the keyboard interrupt not work?

Question

The code below runs on boot via this command in the /etc/rc.local file: python3 /home/pi/Desktop/booth.py. When a button is pressed, the PiCamera preview begins, which covers my whole monitor screen so I cannot do anything. The Ctrl-C interrupt in the code is supposed to stop the program. The interrupt works when I run the booth.py file from the terminal, but not when it is run from the rc.local file. My goal is to have the program run automatically on boot from the rc.local file but maintain the ability to stop it with the keyboard interrupt. Here is my code:

from time import sleep #lets us set delays in our code
import os #allow us to do command line commands
import RPi.GPIO as GPIO #RaspberryPi IO pins
import picamera #camera library

GPIO.setmode(GPIO.BCM) # set the mode for pin numbering
camera = picamera.PiCamera() #create camera object
button = 4 #take photo button pin
GPIO.setup(button, GPIO.IN, pull_up_down=GPIO.PUD_UP)#sets button as input
try:
        while True:#loop
            input_state = GPIO.input(button)#get state of take photo button
            if input_state == False:#if button is pressed
                c = GPIO.wait_for_edge(button, GPIO_RISING, timeout=3000)
                if channel is None:
                   break
                else:
                    camera.start_preview()#begin preview (if RPi just turned on)
                    camera.capture("photo.jpg")#take photo
        camera.stop_preview()#stop camera preview
        GPIO.cleanup()#cleanup pins
        os.system("sudo shutdown -h now")#shutdown
except KeyboardInterrupt:#interrupt Ctrl-C
    print('stopped')

Why does the keyboard interrupt not work?

0 Answers0