ESP8266 Community Forum

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.

how about trying via the 3V3 pins?

spike7638 wrote: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 !

Is there any particular reason not to use the 3v3 pins?