ESP32 Forum

I have doit esp32 devkit v1. It has 30 pins

Shows on arduino serial monitor

rst:1x10(RTCWDT_RTC_RESET) , boot:0x1f(SPI_FAST_FLASH_BOOT)
flash read err,1000
ets_main.c 371
ets jun 8 2016 00:22:57

i removed it from circuit and tried alone but show same problem.
I used esp32 2-3 times in my circuit it worked fine but after that it malfunction and i desolder from circuit and conected to re-upload code . Now i am having trouble to upload code

I googled my problem and i assume that my boot mode change to spi from uart so Please tell me how can i change the boot mode in esp32 so i can upload codes from pc

I had the same error message. I use a hardware timer and when things are fine I get a single message about the initializing status of the hardware timer. I commented out the entire contents of the hardware timer interrupt and added back in one item at a time till I found the item that caused the error and then worked to fix that item code.

So it is a hardware issue?

If you search google Doit ESP32 you will find a lot of people with this problem. it appears that their design is susceptible to low voltage, especially if powered from a USB port alone. Most people have got over this by adding in another power supply to Vin or to 3.3V.. My solution is to buy from another supplier.

I think power is not an issue because i power it with 11.1 v li-ion battery pack and simultaneously connected with my pc to see readings in serial monitor.
And i tried again but my esp32 getting hot but not solved issue

idahowalker wrote: ↑

Mon Nov 19, 2018 9:56 am

I commented out the entire contents of the hardware timer interrupt and added back in one item at a time till I found the item that caused the error and then worked

How did you done that? can you provide explanation and code if required?

I have downgrade esp32 to 2.0.10 from Board manager or Library of esp32 in Library mangement. its solved