PC Event Sample

This sample demonstrates reading input states of photocoupler using interrupt.

To run the sample:

  1. Copy the sample code to a folder on the Raspberry Pi.

  2. Open terminal, and then go to the folder you copied the sample.

  3. Run the sample with the following command:

python3 Photocoupler_Event.py

Sample Code

#!/usr/bin/env python3

#This sample demonstrates reading input states of photocoupler using interrupt.
#Install IoT HAT 3 library with "pip3 install turta-iothat3"

from time import sleep
import RPi.GPIO as GPIO

#Photocoupler 1 Event
def pc1_event(ch):
    print ("Photocoupler 1 is " + ("high. " if GPIO.input(pc1) else "low."))

#Photocoupler 2 Event
def pc2_event(ch):
    print ("Photocoupler 2 is " + ("high. " if GPIO.input(pc2) else "low."))

#Photocoupler Pins
pc1, pc2 = 16, 19

GPIO.setup(pc1, GPIO.IN, pull_up_down = GPIO.PUD_DOWN)
GPIO.setup(pc2, GPIO.IN, pull_up_down = GPIO.PUD_DOWN)
GPIO.add_event_detect(pc1, GPIO.BOTH, callback=pc1_event, bouncetime=10)
GPIO.add_event_detect(pc2, GPIO.BOTH, callback=pc2_event, bouncetime=10)
#GPIO Edge detection options: GPIO.BOTH, GPIO.RISING or GPIO.FALLING

#Add your configuration code here

    while True:
        #Add your code here


#Exit on CTRL+C
except KeyboardInterrupt:


When you run the sample, it prints input state changes on the photocoupler. The example output should be like this:

Photocoupler 1 is high.
Photocoupler 1 is low.
Photocoupler 2 is high.
Photocoupler 2 is low.

To stop the Python script, just press CTRL + C.

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