theyosh
commented
6 months ago Hi,
after reading the wiki of the hardware, I came with the following external relay code:
#!/usr/bin/env python3
# All installed python libraries are available in this custom script
import sys
from pathlib import Path
from datetime import datetime
DEBUG = False
if DEBUG:
debug_file = Path("/tmp/terrariumpi_test_relay_script.txt")
# DockerPi 4 relay extra code
import smbus2
DEVICE_BUS = 1
DEVICE_ADDR = 0x10
bus = smbus2.SMBus(DEVICE_BUS)
def get_relay_number():
return Path(__file__).stem.split('-')[1]
relay_number = get_relay_number()
# End DockerPi 4 relay extra code
# When there is no extra arguments, TerrariumPI expect a float value above 0.0 to return the current state.
# Return -1.0 when not supported, or want to duplicate an existing relay
if len(sys.argv) == 1:
# Call your readout or current state code here....
# In this demo no read out option, return default value of -1.0
print("-1.0")
# Here we start to set the relay to the requested state: Off (=0) or On (>0)
else:
try:
value = int(float(sys.argv[1]))
except Exception as ex:
raise ValueError(f"Invalid input value. Should be a number between 0 and 100 including. Error {ex}")
if not (0 <= value <= 100):
raise ValueError("Invalid input value. Should be a number between 0 and 100 including")
if value == 0:
if DEBUG:
debug_file.write_text(f"[{datetime.now()}] Toggle power switch to state OFF => {value}\n")
# Call your code here to toggle the relay to OFF ....
# Docker Pi 4 relay code
bus.write_byte_data(DEVICE_ADDR, relay_number, 0x00)
else:
if DEBUG:
debug_file.write_text(f"[{datetime.now()}] Toggle power switch to state ON or dimming value: => {value}\n")
# Call your code here to toggle the relay to ON ....
# Or when using it as a dimmer, use the `value` to set the dimmer
# Docker Pi 4 relay code
bus.write_byte_data(DEVICE_ADDR, relay_number, 0xFF)Make sure you name the file something like dockerpi_4_relay-1.py where the -1.py is very important. The code uses the filename to find the relay to toggle. So when you have created a file called dockerpi_4_relay-1.py and make a symlink to dockerpi_4_relay-2.py, dockerpi_4_relay-3.py and dockerpi_4_relay-4.py you have one single file for all the 4 relays.
And the code can figure out based on the filename which relay it should control.
Your version has some user input, which is interactive, and that does not work with external relays.
ThunderClap86
Not a programmer in any way, and you're my crash course (if you couldn't tell). I have tried already to integrate into the externalswitch.py with the existing code. No luck so far with the current configurations. When I told my wife what I was planning on doing, she bought this relay HAT for me off of Amazon and I didn't realize until too late that its not fully supported. That's why I bought the Qwiic Quad Relay(which is now working beautifully). Just as a challenge for a second tank/terrarium, I was hoping to get support for this random hardware I now have.
_ ##################### I'm hoping that this thing is simple enough to compile. I am able to use i2cset -y 1 0x10 0x01 0x00/0xFF (ON/OFF) to trigger the relay manually, I just do not know how to make or edit an executable script that might make this work.
product link/wiki
##################### MY ATTEMPT: