ESP8266 Community Forum

- Tue Mar 17, 2015 7:52 am #12099 Hello,

Arduino specifications state that 3.3V out can only deliver 50mA, lower than ESP module needs at peaks. I am wondering if it is possible to power ESP from the 5V on the arduino, using a LM317T regulator.

I plan to use it like in this schematic:

- Tue Mar 17, 2015 6:08 pm #12141 While this may work, the question is how you plan to power the Arduino. If it is from an external power supply, not a problem (although the current drawn by the ESP can get into the 200mA range at times). If, however, it is from the 5V from the USB interface, you may have a problem.

- Fri Mar 20, 2015 1:06 am #12300 The 5v pin on an arduino can only source 200ma. It would be better to source from an external power supply. It probably would work but I don't think your arduino would survive long term.

- Fri Mar 20, 2015 8:24 am #12320 The ADJ pin of the LM317T does not appear to be connected to anything.