USB Controlled relay

I need a very simple relay to operate a wired electric door latch. The connection to the door is available at the Indigo server location. So, all I need is a very basic relay. This one was low priced and looked like it would do the job. https://www.amazon.com/dp/B01CN7E0RQ

I can probably create a simple virtual device with a couple of shell scripts. But, I was wondering if anyone here had any experience with this or some similar product.

TIA

No experience with such things, but looks interesting.

You may have already seen it, but someone added a simple Python script in the review section so it looks like Indigo integration would be straight-forward (not including the script here in case it's not the way to go with this device).

No experience with such things, but looks interesting.
You may have already seen it, but someone added a simple Python script in the review section so it looks like Indigo integration would be straight-forward...

Thanks. Could you send me the link to that post. Not sure where the "review section" is

BTW, there sis a USB driver for the Mac as well as some VERY rudimentary software support at https://download948.mediafire.com/xjxqv ... S-1_EN.zip

The reviews of the product at Amazon you linked to.

https://www.amazon.com/dp/B01CN7E0RQ

The reviews of the product at Amazon you linked to.
https://www.amazon.com/dp/B01CN7E0RQ

Doh. I figured you meant in the Indigo forums.

The reviews of the product at Amazon you linked to.
https://www.amazon.com/dp/B01CN7E0RQ

I missed it on the first pass. I just needed to search the reviews for Python. So, it would be pretty easy to just pass an arg on the command line for on or off. Or, a similar shell script calling nc (netcat), or even

Code: Select all

echo -n -e '\xA0\x01\x00\xA1' > /dev/ttyUSBfoo #on
echo -n -e '\xA0\x01\x01\xA2' > /dev/ttyUSBfoo #off

Too bad there does not seem to be a status command. In any case, I have ordered one and will report back as to how it works.

EDIT: There is a status query: FF

Ok. I received the relay and it works. Though, it has limitations, although you can supposedly get a status from it, attempts to read from it return nothing. Other than that, it is really perfect for my application, releasing a door lock.

Code: Select all

import serial
import time

ser = serial.Serial('/dev/cu.wchusbserialfd130', 9600)
ser.write(serial.to_bytes([0xA0, 0x01, 0x01, 0xA2]))
time.sleep(5.0)
ser.write(serial.to_bytes([0xA0, 0x01, 0x00, 0xA1]))