CM3-Home technical documentation Buy
The contacts are available on screw terminals. Each contact can be closed on a single common line.
The input lines are opto-isolated from the CPU side and are in the same "electrical domain" of the RS485 ports.
The GPIOs used are:
import RPi.GPIO as GPIO
import time
INP_LEFT=28
INP_RIGHT=29
RELAY_LEFT=21
RELAY_RIGHT=22
GPIO.setmode(GPIO.BCM)
GPIO.setwarnings(False)
GPIO.setup(INP_LEFT,GPIO.IN)
GPIO.setup(INP_RIGHT,GPIO.IN)
GPIO.setup(RELAY_LEFT,GPIO.OUT)
GPIO.setup(RELAY_RIGHT,GPIO.OUT)
while True:
if GPIO.input(INP_LEFT):
GPIO.output(RELAY_LEFT,GPIO.LOW)
else:
GPIO.output(RELAY_LEFT,GPIO.HIGH)
if GPIO.input(INP_RIGHT):
GPIO.output(RELAY_RIGHT,GPIO.LOW)
else:
GPIO.output(RELAY_RIGHT,GPIO.HIGH)