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I want to power my nodemcu module with 3.3 V.

Does powering it with 3.3 V also power USB-UART module?

If so I do not want this as it eats the battery.

enter image description here

Bence Kaulics
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a-c-sreedhar-reddy
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1 Answers1

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Yes, the schematic of the v1.0 NodeMCU shows that the 3.3 V bus is directly connected to the CP2102 chip.

enter image description here

You have two possibilities:

  1. Cut the 3.3 V trace on the PCB before the CP2102 chip. Not recommended as you will disable your programming interface and would be hard to restore it.
  2. The reset pin (RST) pin of the CP2102 is floating, you can try to pull it down to GND and keep the chip in reset, to see if that makes it any better.
Bence Kaulics
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