If you need to control power via your computer’s USB port, this is the right one to choose. This module has a CH340 USB to serial interface chip, and a STM8S103 MCU as a gateway to receive command and then control the relay to turn on and off. The relay module (SRD-05VDC-SL-C) can load up to 10A 250VAC power with no issue, that is enough for most of the applications.
Install the CH340 driver, write a few lines of codes, then developers can control a relay module. There are two LED indicators, one is for USB port connection and one is for relay on and off status.
- Turn On: A0 01 01 A2
- Turn Off: A0 01 00 A1
Python example code:
usb_relay = serial.Serial("COM17",9600)
on_cmd = b'\xA0\x01\x01\xa2'
off_cmd = b'\xA0\x01\x00\xa1'
- Baud Rate: 9600BPS
- Relay Lifetime: 100K times
- Relay Contact Rating : AC 250V 10A, DC 30V 10A
- Dimensions: 63 x 16.3 x 19.2mm
- Weight: 15g