ESP-12F 4 Channel Relay Board
Model reference: ESP12F_Relay_X4
ESP-12F 4 Channel

Available from:

Flashed with:
Serial port

GPIO #Component
GPIO00 User
GPIO01 User
GPIO02 User
GPIO03 User
GPIO04 User
GPIO05 User
GPIO09 User
GPIO10 User
GPIO12 Relay3
GPIO13 Relay4
GPIO14 Relay2
GPIO15 User
GPIO16 Relay1
ADC0 User
Template for Tasmota v9.1+

Headers must be soldered and jumpers needs to be installed for enabling relays.

The board uses GPIO16 and so Relay1 is always turned ON when power is applied to the board, causing a brief on/off pulse on the relay as Tasmota loads and turns it off again. Of course, if the last state was ON, then it will stay ON. It’s still a very useful board at a bargain price; just a shame the designer was too lazy to route a different GPIO pin. (Although rather than using the provided link pair, you could link to IO0 IO2 or IO15 thru-holes on the side of the board instead of IO16, and change the template to suite.)