Power Supply for NodeMCU

[peter_war]

Hi Guys,
I am just trying out different power supplies for my NodeMCU ESP8266 board. I notice that when I power up my board with a 3.3V supply directly into 3.3V pin, it works fine. However, if I try to power it up from Arduino Nano 3.3V pin, that means, I first power my Arduino Nano from a USB, then I connect the 3.3V from the Nano 3.3pin into my NodeMCU 3.3pin, then the NodeMCU doesn't work anymore.

I am doing this just out of curiosity. Any idea why it doesn't work anymore?

[Wawa]

@peter_war

if I try to power it up from Arduino Nano 3.3V pin...

A NodeMCU draws almost 100mA, with 400mA peaks.
The 3.3volt supply of a classic Nano is only capable of delivering 30mA.
See the problem?

You can power the NodeMCU with a 5volt cellphone charger.
Leo..

[peter_war]

I see. Got it. Thanks!