ModMyPi PiOT example code

piot_test.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

# https://www.modmypi.com/raspberry-pi/breakout-boards/modmypi/modmypi-piot-relay-board

from __future__ import print_function, unicode_literals
import sys
import RPi.GPIO as GPIO
import time


RELAY_CONNECT_PIN = 3  # GPIO 2 (not configurable)
RELAY1_PIN = 29  # GPIO 5
RELAY2_PIN = 31  # GPIO 6
RELAY3_PIN = 33  # GPIO 13
RELAY4_PIN = 35  # GPIO 19
RELAY_LIST = [
    RELAY1_PIN,
    RELAY2_PIN,
    RELAY3_PIN,
    RELAY4_PIN
]


def handshake():
    for idx in range(4):
        GPIO.output(RELAY_CONNECT_PIN, 1)
        time.sleep(0.05)
        GPIO.output(RELAY_CONNECT_PIN, 0)
        time.sleep(0.05)


def do_piot_test():
    try:
        GPIO.setwarnings(False)
        GPIO.setmode(GPIO.BOARD)

        GPIO.setup(RELAY_CONNECT_PIN, GPIO.OUT)
        GPIO.output(RELAY_CONNECT_PIN, 0)

        for relay_pin in RELAY_LIST:
            GPIO.setup(relay_pin, GPIO.OUT)
            GPIO.output(relay_pin, 0)

        time.sleep(2)

        handshake()

        for relay_pin in RELAY_LIST:
            GPIO.output(relay_pin, 1)
            time.sleep(1)
            GPIO.output(relay_pin, 0)
            time.sleep(1)

        time.sleep(2)

        handshake()

    finally:
        GPIO.cleanup()


if __name__ == "__main__":
    try:
        do_piot_test()

    except Exception as e:
        print('Error:{}: {}'.format(e.__class__.__name__, e), file = sys.stderr)
        sys.exit(1)

    except KeyboardInterrupt:
        pass