ESP32 Forum

Posted: **Thu Nov 15, 2018 10:05 pm**

I am unable to upload/flash code to my sparkfun esp32 thing because the chip is stuck in a reboot loop. The device keeps restarting and printing this message on the serial monitor.

Brownout detector was triggered

ets Jun 8 2016 00:22:57

rst:0xc (SW_CPU_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT)
configsip: 0, SPIWP:0xee
clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00
mode:DIO, clock div:1
load:0x3fff0018,len:4
load:0x3fff001c,len:812
load:0x40078000,len:0
load:0x40078000,len:11572
entry 0x40078a5c

Posted: **Sat Nov 17, 2018 3:17 am**

The brownout detector triggering usually indicates a power supply issue. Can you try a different USB cable, or maybe powering the Thing from an external source?

Posted: **Sun Feb 24, 2019 4:43 pm**

I have tried powering the device from an Arduino, a wall usb adapter, and another computer. All of them have the same effect. The esp32 just prints out "Brownout detector was triggered." I have included an image of the serial monitor output.

: Serial monitor; putty_2019-02-24_11-42-10.png (8.86 KiB) Viewed 5237 times

Posted: **Mon Feb 25, 2019 2:29 am**

Strange. Do you have other things connected to the Thing? Any chance of feeding it off a 3.3V source (e.g. a lab PSU) directly?

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