Buyed one for installing custom firmware to open a garage door. Had to reverse eng. to find pinouts since there's no schematics. Found : GPIO4/19 = Relay (node MCU arduino pin name : D2) GPIO5/20 = input (node MCU arduino pin name : D1) 2 leds seems to be connected, one on output (activated a the same time of relay) and one on optocoupled input. I did not played with the input, but it seems it have to be powered with a 5V to activate. 2 connectors (2 pins, and 3 pins) have to be soldered to flash device. 3 pins needs to be connected to usb serial adapter (3.3V !!!). The 2 pin have to be shorted before switching on to make the device go on programming mode. Pgrogramming can be done on arduino environnement using NodeMCU ESP12E profile. Works, but a schematic would be appreciated to makers :) It's a bit expensive compared to SOnoff device.

Buyed one for installing custom firmware to open a garage door. Had to reverse eng. to find pinouts since there's no schematics. Found : GPIO4/19 = Relay (node MCU arduino pin name : D2) GPIO5/20 = input (node MCU arduino pin name : D1) 2 leds seems to be connected, one on output (activated a the same time of relay) and one on optocoupled input. I did not played with the input, but it seems it have to be powered with a 5V to activate. 2 connectors (2 pins, and 3 pins) have to be soldered to flash device. 3 pins needs to be connected to usb serial adapter (3.3V !!!). The 2 pin have to be shorted before switching on to make the device go on programming mode. Pgrogramming can be done on arduino environnement using NodeMCU ESP12E profile. Works, but a schematic would be appreciated to makers :) It's a bit expensive compared to SOnoff device.

Buyed one for installing custom firmware to open a garage door. Had to reverse eng. to find pinouts since there's no schematics. Found : GPIO4/19 = Relay (node MCU arduino pin name : D2) GPIO5/20 = input (node MCU arduino pin name : D1) 2 leds seems to be connected, one on output (activated a the same time of relay) and one on optocoupled input. I did not played with the input, but it seems it have to be powered with a 5V to activate. 2 connectors (2 pins, and 3 pins) have to be soldered to flash device. 3 pins needs to be connected to usb serial adapter (3.3V !!!). The 2 pin have to be shorted before switching on to make the device go on programming mode. Pgrogramming can be done on arduino environnement using NodeMCU ESP12E profile. Works, but a schematic would be appreciated to makers :) It's a bit expensive compared to SOnoff device.

I buy a lot of items from Banggood and rarely have a problem. I bought this item with a view to purchasing a lot more. The connection details were found in the reviews/feedback but were not in the downloadable documentation - an oversight. Although there is an Android (apk) file there is no information of what is does or why you would need it. It would be nice if an example Arduino application was included so users could upload and try it straight away. Some guidance can be found here - but bear in mind the I/O ports may be different: https://openhomeautomation.net/control-relay-anywhere-esp8266/ http://iot-playground.com/blog/2-uncategorised/40-esp8266-wifi-relay-switch-arduino-ide http://www.electrodragon.com/w/ESP_Relay_Board

I buy a lot of items from Banggood and rarely have a problem. I bought this item with a view to purchasing a lot more. The connection details were found in the reviews/feedback but were not in the downloadable documentation - an oversight. Although there is an Android (apk) file there is no information of what is does or why you would need it. It would be nice if an example Arduino application was included so users could upload and try it straight away. Some guidance can be found here - but bear in mind the I/O ports may be different: https://openhomeautomation.net/control-relay-anywhere-esp8266/ http://iot-playground.com/blog/2-uncategorised/40-esp8266-wifi-relay-switch-arduino-ide http://www.electrodragon.com/w/ESP_Relay_Board

I buy a lot of items from Banggood and rarely have a problem. I bought this item with a view to purchasing a lot more. The connection details were found in the reviews/feedback but were not in the downloadable documentation - an oversight. Although there is an Android (apk) file there is no information of what is does or why you would need it. It would be nice if an example Arduino application was included so users could upload and try it straight away. Some guidance can be found here - but bear in mind the I/O ports may be different: https://openhomeautomation.net/control-relay-anywhere-esp8266/ http://iot-playground.com/blog/2-uncategorised/40-esp8266-wifi-relay-switch-arduino-ide http://www.electrodragon.com/w/ESP_Relay_Board