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ESP32-WROOM-32 Power On Problem
Posted: Sun Sep 13, 2020 1:30 pm
by phorena_bob
A problem was found on our ESP32-WROOM-32 chipset-based board. The program was successfully download and run. However, when we power up the device, it do not run until we press the reset button. The problem was found in Ardurio and IDF environment. Can anyone help me? Thank you!
Re: ESP32-WROOM-32 Power On Problem
Posted: Mon Sep 14, 2020 8:32 am
by ESP_Sprite
Can you post the circuit you're using? Specifically, what is the logic around the EN pin of the ESP32 module?
Re: ESP32-WROOM-32 Power On Problem
Posted: Tue Sep 15, 2020 3:07 am
by phorena_bob
- Capture2.PNG (6.93 KiB) Viewed 4067 times
- Capture1.PNG (27.44 KiB) Viewed 4067 times
The schematic is attached
Re: ESP32-WROOM-32 Power On Problem
Posted: Tue Sep 15, 2020 9:49 am
by ESP_Sprite
Possibly your power-supply rise time is too slow for the RC circuit on the reset line to do its work properly. Can you try changing C77 to an 1uF capacitor?
Re: ESP32-WROOM-32 Power On Problem
Posted: Tue Sep 29, 2020 8:13 am
by phorena_bob
no. The capacitor was changed but it is the same. Any other solutions?
Re: ESP32-WROOM-32 Power On Problem
Posted: Tue Sep 29, 2020 1:42 pm
by ESP_Sprite
In general, perhaps it's useful to use a scope to measure the waveforms on the EN and the 3V3 pin on the module? You can check the ESP32 datasheet, iirc there's a graph in there showing what the waveforms should look like.