RPICT3T1 RLY2
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Overview
- 3 AC current input port
- 1 Temperature DS18B20 port
- 2 Relays 250V (7A to 10A depending on stock).
Compatibility
| Version | Compatible? |
|---|---|
| Raspberrypi 1 A | No |
| Raspberrypi 1 B | No mounting holes. |
| Raspberrypi 1 B+ | Yes |
| Raspberrypi 2 B | Yes |
| Raspberrypi 3 B | Yes |
| Raspberrypi 3 B+ | Yes |
| Raspberrypi 4 B | Yes |
| Raspberrypi 5 | Yes |
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.
Relay Control
Connection
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)
Technical specs
Relays are HLS8L-DC5V.
The datasheet is available here.
Control
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[1])
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
