Custom ESP32 PCB Not Recognized by PC

traaga
Posts: 3
Joined: Fri Jul 26, 2024 7:44 pm

Custom ESP32 PCB Not Recognized by PC

Postby traaga » Fri Jul 26, 2024 7:49 pm

Hi ESP32 Community,

I designed a custom plant sensor module using EasyEDA and had it made by JLCPCB. When I connect it to my PC, it isn’t recognized, and nothing shows up in the device manager.

I have Windows 10 and use Arduino IDE for developing. Previously have had no problem with other ESP32 devkit or cable etc.

Could anyone suggest troubleshooting tips, review my schematic for potential issues, or point out common mistakes in ESP32 designs?
Schematic_Plant-Sensor-Module-V1_2024-07-26 (1).png
Schematic_Plant-Sensor-Module-V1_2024-07-26 (1).png (117.47 KiB) Viewed 1508 times
Thanks in advance for any advice!

ESP_Sprite
Posts: 9766
Joined: Thu Nov 26, 2015 4:08 am

Re: Custom ESP32 PCB Not Recognized by PC

Postby ESP_Sprite » Sat Jul 27, 2024 1:23 am

You're missing a power-on reset RC circuit for the EN line. Well, you're missing half of it; C2 can act as the capacitor, you only need to add an 10K or so resistor from EN to 3.3V. Also, you'll want to remove C9; that stops the board from booting into the firmware on power-up. You also want to add a pullup to GPIO8 (or simply connect it to 3.3V) otherwise programming will randomly work/not work.

Aside from that, I see no reason why this circuit wouldn't enumerate as an USB device; none of the aforementioned issues should stop that from happening. Suggest you check your voltages to begin with.

traaga
Posts: 3
Joined: Fri Jul 26, 2024 7:44 pm

Re: Custom ESP32 PCB Not Recognized by PC

Postby traaga » Sat Jul 27, 2024 11:25 am

Hi, I checked the voltages and everything seemed to be in order. I removed the C2 and added a connection to the now empty slot. Also I added a 10K resistor between EN and 3.3V. My PC now recognizes the device but it keeps disconnecting every 1 second.

I also add a picture of the original PCB layout and the corrections that I soldered.
PCB_Plant-Sensor-Module-V1-PCB-Layout_2024-07-27 (2).png
PCB_Plant-Sensor-Module-V1-PCB-Layout_2024-07-27 (2).png (16.38 KiB) Viewed 1361 times
PCB_Plant-Sensor-Module-V1-PCB-Layout_2024-07-27 (3).png
PCB_Plant-Sensor-Module-V1-PCB-Layout_2024-07-27 (3).png (23.1 KiB) Viewed 1361 times

traaga
Posts: 3
Joined: Fri Jul 26, 2024 7:44 pm

Re: Custom ESP32 PCB Not Recognized by PC

Postby traaga » Sat Jul 27, 2024 5:34 pm

Also when I pull the GPIO9 low, reset it then it keeps the connection. Though when I try to program it gives me write timeout error.

jatkins2431
Posts: 4
Joined: Mon May 20, 2024 2:18 am

Re: Custom ESP32 PCB Not Recognized by PC

Postby jatkins2431 » Fri Aug 02, 2024 1:26 am

Possibly not in bootloader mode? It will recognize and unrecognize when not in bootloader. You can resolve by holding boot, clicking reset, then releasing boot button. A working minimalist schematic for a custom esp32c3 board can be found here if you want to compare your c6: https://www.roboticworx.io/i/140395336/the-schematic
Attachments
Screenshot 2024-08-01 212446.png
Screenshot 2024-08-01 212446.png (118.48 KiB) Viewed 1153 times

Who is online

Users browsing this forum: No registered users and 32 guests