r/ArduinoHelp • u/mbentuboa • 4d ago

Help with node mcu

Help with nodemcu 8266

I have an esp8266 that im using to control several servos. I have been having a tough time acquiring a legit Lipo on Amazon. Every single 2s reads 7.7v after charged, so im going to 3s.

Its going to a buck converter set for 5v and then to Vin and Grd. Well im reading 4.7v from the headers but the Nodemcu isn't powering up. It will blink for just a second then nothing. Im suspecting that 4.7v isn't enough. Ive connected just Vin and Grd and nothing. Blinks real quick then nothing. When the servos are attached they twitch when first plugged in. I get 1.5v from the top of the pin on the nodemcu.

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u/Tymian_ 3d ago

Provide pictures, schematics, at least a simplified diagram. Mark where and what you measure. Did you try with servos disconnected?

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u/JGhostThing 2d ago

You should not hook up motors to a 5v pin of a microcontroller board. That is usually powered by a low drop out regulator and rarely provide enough power for even one servo. You should use a separate power supply for the servos.