ESP8266 Community Forum

- Sun Apr 02, 2017 9:06 pm #64535 I've got a nodeMCU (https://www.amazon.com/gp/product/B010O ... UTF8&psc=1) that I've powered from USB, and it worked fine. Now I'd like to get power from a different source, which happens to provide 3.3V .... but when I apply that to the Vin pin in the lower left corner of the board, I get nothing. I assume that there's a voltage regulator that has some amount of dropout, and trying to derive 3.3V from 3.3V just isn't going to work.

Is there somewhere else I can apply my 3.3V supply and make this thing go? If not, so be it. But if so, I'd love to know about it.

- Mon Apr 03, 2017 2:07 am #64541 how about trying via the 3V3 pins?

- Tue Apr 04, 2017 4:11 pm #64628

I've got a nodeMCU (https://www.amazon.com/gp/product/B010O ... UTF8&psc=1) that I've powered from USB, and it worked fine. Now I'd like to get power from a different source, which happens to provide 3.3V .... but when I apply that to the Vin pin in the lower left corner of the board, I get nothing. I assume that there's a voltage regulator that has some amount of dropout, and trying to derive 3.3V from 3.3V just isn't going to work.

Is there somewhere else I can apply my 3.3V supply and make this thing go? If not, so be it. But if so, I'd love to know about it.

Vpin is connected to regulator, minimum voltage is 4.2 or 5v, i dont remember.. put 5v in Vpin and gnd to gnd, work`s normally !

- Tue Apr 04, 2017 4:58 pm #64632 Is there any particular reason not to use the 3v3 pins?