Product description
This is a 8-relay board with an ESP32-WROOM-E.
Each relay has COM+NO+NC exposed. Product descriptions don’t seem to specify maximum load. Each relay supports 10Amp max load, acconding to the label.
The board can be powered either via 7-30VDC or via 5VDC (separate connectors). It draws about 100mA with the relays off, and just over 500mA with all the relays on.
I bought it from: https://www.aliexpress.us/item/3256802045374301.html
GPIO Pinout
This board has headers for every GPIO pin on its ESP32.
| Pin | Comment |
|---|---|
| 5V | Do not use 5V for programming |
| TX | Exposed on board 3.3V level! |
| RX | Exposed on board 3.3V level! |
| GND | |
| GND | |
| GPIO0 | 3.3V level! (Connected to a push button for programing) |
Basic Config


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