I have an ESP32 project up and running. If I power it via the microUSB on the Heltec ESP32 DEVKIT board that I'm using, all is well. If, however, I run 5V to the VIN pin on the Heltec, it boots up and then goes into a loop of continuously rebooting every 3 seconds, almost like a watchdog. Could th…

I just wire gnd to usb shield and now works perfectly from external power. Seems there is a component between board gnd and usb gnd...

Hello milika greetings from Mexico, what pins or how did you connect GND to the USB port? There are also some errors in the letters it seems to me, of some pins like instead of saying GND it should say CMD. When I put 5 to 7 V to vin, the led blinks, I have to put up to 9v for it to stabilize. This …

milika: I just wire gnd to usb shield and now works perfectly from external power. Seems there is a component between board gnd and usb gnd... Hello milika greetings from Mexico, what pins or how did you connect GND to the USB port? There are also some errors in the letters it seems to me, of s…

It is strange that this issue has not been located by now. I have been using this device for a couple of years now to operate a string of lights that are in a remote location. I control to power through a sonoff switch and used the OTA system to change the sequences. About two months ago,(AUG2020), …

Why not bring the issue up with the people who made the ESP? ESPRESSIF ESP32 web site https://esp32.com/

I went to Espressif forum website and found a workaround from a poster regarding the same subject. I don't think the problem is caused by the chip maker as much I think it may be caused by the myriad of board assembly people. The answer that was supplied was to connect the power to the device with t…

The path of least resistance would be to step down to 3.3V and power up with that pin. Or to power with a separate lifepo4.

This topic was begun more than two years ago, and still remains a problem. I use an ESP32-Dev kit, and when powered via USB bus, it all works fine, always. But as I am preparing for a mobile device, I tried to use a Li-Ion (nominally 3.7V, fully charged 4.2V) via a Buck-Boost board set to 3.3V and …

I have found that the ESP32 does not like getting switched 3.3V. If I power the ESP32 from 5V I use a switched P.S. and put a polarized cap on the 3.3V pin to gnd. When I power the ESP32 with 3.3V, I always use a MCP1700 LDO 3.3V regulator with proper input/output filtering.

@Idahoewalker: the MCP1700 LDO 3.3V is rated at 250mA output, which is only half of the ESP32 Datasheet recommendation of 500mA: Notes on power supply: • The operating voltage of ESP32 ranges from 2.3 V to 3.6 V. When using a single-power supply, the recommended voltage of the power supply is 3.…

ESP32 works powered by USB but reboots from power supply

Other Hardware 3rd Party Boards

shawn_t September 27, 2021, 10:23am 37

Check that your external PSU can provide efficient current.

Topic		Replies	Views
Do's and Don'ts regarding the ESP boards 3rd Party Boards	36	588	June 18, 2026
ESP32 loses flash contents when 5v PSU gets turned off 3rd Party Boards	36	408	May 6, 2026
ESP32-S3 powering problems General Guidance	12	451	March 26, 2026
NANO ESP32: Where is the Vin pin? 3rd Party Boards	79	517	May 13, 2026
ESP32-S3 Devkit brownout and need USB to reset 3rd Party Boards	15	1556	April 29, 2024

ESP32 works powered by USB but reboots from power supply

Related topics