ESP32 Forum

Hi all,

I have an ESP32 on a custom PCB, and I use this board to program the ESP - I hooked the ESP-Prog board to my PCB with wires:

https://mm.digikey.com/Volume0/opasdata ... o1EALw_wcB

I download to code to the ESP32. And it works. So far so good. What I want to do is getting rid of the programmer.
Now, here is the problem, it looks like that after being programmed, the ESP32 still needs the RST pin to be connected to the programmer RST to work. If I power cycle the ESP32 without giving the RST pin, it doesn't work, but the moment I connect the RST pin it works. I want to generate the behavior of the RST pin to activate the ESP.

What I don't understand though, is what this pin does because I used the oscilloscope to monitor it and it basically doesn't do anything, it's a 0V signal, and it doesn't send an interrupt when I connect the ESP to the programmer, which is what I was expecting.

I'd appreciate if you could help with this

Your custom PCB should have a reset circuit, usually a resistor to Vcc and a capacitor to ground, on the EN input. Do you have that?

ESP_Sprite wrote: ↑

Sat May 04, 2024 4:51 am

Your custom PCB should have a reset circuit, usually a resistor to Vcc and a capacitor to ground, on the EN input. Do you have that?

Thanks for your answer. Yes I have both

Do you possibly have a capacitor between IO0 and ground, potentially in an attempt to debounce a boot button or something?
If not, can you post your schematic? It's a bit of a guessing game if we don't have that.