ESP8266 Community Forum

Hi,

I have purchased a pile of SonOff POW modules that I want to flash with alternate firmware that supports MQTT.

All the instructions say to just connect an FTDI board and off you go. Only, I don't have one handy and it will take several days to get one.

Is there a way I can use one of my existing NodeMCU boards to connect to the SonOff POW board (knowing you can't have it connected to AC to program, etc...) to be able to load the firmware?

I was thinking of writing a simple RS232 bridge firmware to take the USB serial stream and route it to the external serial pins. Would that work?

Thanks
Robert

Sounds like a great idea. The port voltages are correct. You should be able to connect Rx->Tx and Tx->Rx plus Vcc & ground. The SPX3819 5V to 3V3 500mA regulator on the NodeMCU should handle the programming current after using only about 70mA for itself. My Sonoff is consuming less than 80mA. Good luck with streaming. Let us all know how it works out!