Adding a UART Interface to a USB Relay Board

This Chinese “8-Channel USB Relay Board” requires a 12V power supply, and it’s also supposed to plug into┬áthe PC for convenient software control. But there was nothing convenient about the software, and I wanted it to work directly with Arduino and other MCUs anyway. Here’s how I replaced the USB interface with a basic UART.

USB Relay Board Hack Closeup
USB Relay Board Hack Closeup

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