ESP32-S3-DevkitC does not boot up when powered by external 5V supply

bla-bla-bla
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ESP32-S3-DevkitC does not boot up when powered by external 5V supply

Postby bla-bla-bla » Mon Jun 03, 2024 10:21 pm

I am using the ESP32-S3-DevkitC with Arduino IDE. When I load a program from Arduino via USB, the code runs without issues. When I remove the USB connection and power the DevkitC board with an external 5V DC power supply, the program does not run. If I press the reset button the program runs.
How can I get the ESP32-S3-DevkitC to boot up from an external 5V supply without physically pressing the reset button?
Thanks

ESP_Sprite
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Joined: Thu Nov 26, 2015 4:08 am

Re: ESP32-S3-DevkitC does not boot up when powered by external 5V supply

Postby ESP_Sprite » Tue Jun 04, 2024 12:30 am

Can you try adding an 10uF capacitor between Gnd and EN?

bla-bla-bla
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Re: ESP32-S3-DevkitC does not boot up when powered by external 5V supply

Postby bla-bla-bla » Tue Jun 04, 2024 12:35 am

OK. I will try that. Just to clarify, it looks like the EN pin is connected to the RST pin on the Devkit board (pin 3 on J1). Is this correct?

ESP_Sprite
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Re: ESP32-S3-DevkitC does not boot up when powered by external 5V supply

Postby ESP_Sprite » Tue Jun 04, 2024 12:55 am

Yes, that is correct.

bla-bla-bla
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Re: ESP32-S3-DevkitC does not boot up when powered by external 5V supply

Postby bla-bla-bla » Tue Jun 04, 2024 1:41 pm

I added a 10uF capacitor between 5V and GND. It still did not boot up and run the program the first three times I applied 5V. However, it did start up the forth time I applied 5V. So this is solution looks like movement in the right direction but marginal and that obviously is not good enough. Any other suggestions? Different capacitor value?

By the way, I also tried powering the board with 3.3V and that does not work either, but I do get a message over the U9TXD (GPIO43):
rst:0xf (BROWNOUT_RST),boot:0x0 (DOWNLOAD(USB/UART0))
waiting for download

bla-bla-bla
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Joined: Mon Jun 03, 2024 10:16 pm

Re: ESP32-S3-DevkitC does not boot up when powered by external 5V supply

Postby bla-bla-bla » Tue Jun 04, 2024 4:36 pm

Correction to last post. I added a 10uF capacitor between RST(EN) and GND.

ESP_Sprite
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Re: ESP32-S3-DevkitC does not boot up when powered by external 5V supply

Postby ESP_Sprite » Wed Jun 05, 2024 12:24 am

That is nice, but did you also try it between EN/reset and gnd like I suggested?

bla-bla-bla
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Re: ESP32-S3-DevkitC does not boot up when powered by external 5V supply

Postby bla-bla-bla » Wed Jun 05, 2024 2:23 pm

I corrected my original post.
My last post says:
"I added a 10uF capacitor between RST(EN) and GND"

ESP_Sprite
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Re: ESP32-S3-DevkitC does not boot up when powered by external 5V supply

Postby ESP_Sprite » Fri Jun 07, 2024 12:48 am

Gotcha. Hm, I'm not sure why it does that then... you have nothing else connected to the DevkitC?

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