ESP8266 Community Forum

- Fri Jan 03, 2020 11:33 am #85150 I see online the many options to power the nodemcu, but I wondered if I used 12vdc < 800ma connected to VIN and G, will I still be able to render 5v @ VU ? I have a 5v relay connected there.
Thanks

- Thu Jan 30, 2020 2:08 pm #85503 Hi ob2s

Did you find it out? I am thinking on different ways to power my NodeMCU V3 from a MEGA 2560 and connect them via I2C but I am still not sure about how to control 5V and 3V sensors and if the NodeMCU can be powered with 12V <800mA and provide 5V at VU, I might replan my project.

I think I read somewhere that VU provides 5V from the USB, but I have never check it by myself

- Mon Feb 03, 2020 4:22 pm #85546

Hi ob2s

Did you find it out? I am thinking on different ways to power my NodeMCU V3 from a MEGA 2560 and connect them via I2C but I am still not sure about how to control 5V and 3V sensors and if the NodeMCU can be powered with 12V <800mA and provide 5V at VU, I might replan my project.

I ended up using a cheap buck converter (dc2dc) to connected the 12v adapter.