- 3 AC current input port
- 1 Temperature DS18B20 port
- 2 Relays 250V/10A
AC and Temperature Reading
The RPICT3T1_RLY2 is the same unit as the RPICT3T1 with 2 relays added.
Refer to the RPICT3T1 for full documentation covering the AC reading side.
Each relay port is a 3 way screw terminal block with the following connection:
- NO - Normally Open (Left)
- CO - Common (Middle)
- NC - Normally Closed (Right)
Relays are HLS8L-DC5V.
The datasheet is available here.
The 2 relays are connected to GPIO5 and GPIO6 on the raspberrypi.
These can be easily controlled with the RPi.GPIO module from python.
We made a small script to get you started with this. This can be downloaded as follow:
wget lechacal.com/RPICT/tools/lcl-gpio-toggle.py.zip unzip lcl-gpio-toggle.py.zip
This utility simply toggles the relay state. For example to change the state on the first relay (i.e. gpio5) one will execute
python lcl-gpio-toggle.py 5
The code of the utility is given below.
import RPi.GPIO as GPIO import sys pin = int(sys.argv) GPIO.setmode(GPIO.BCM) GPIO.setwarnings(False) GPIO.setup(pin, GPIO.OUT) state = GPIO.input(pin) if state: GPIO.output(pin, GPIO.LOW) print "GPIO%d Low" % pin else: GPIO.output(pin, GPIO.HIGH) print "GPIO%d High" % pin