ESP32 Forum

Posted: **Fri Jan 14, 2022 8:54 pm**

Hello,
I designed a circuit that contains ESP32-WROOM-32D to be programmed using CP2102N-A01-GQFN28 but it didn't work and I am not able to program it
while programming, I connect GPIO0 to "PROG" (JP1) using a pin header jumper
could someone help me to find the problem?
Attached the part of my schematic that contains the programing circuit

Posted: **Sat Jan 15, 2022 2:13 am**

What happens if you manually ground IO0? If you run a terminal program on your PC on that serial port and you reset the ESP32, do you see anything?

Posted: **Fri Jan 21, 2022 3:12 pm**

Sorry for replying late
I didn't get anything using USB on the terminal even by connecting GPIO0 to GND directly.
I contacted the technical support of the manufacturer of CP2102 ( Siliconlabs ) and they found a mistake in the circuit of CP2102.

the circuit after being modified is attached

do you think that there is any other mistake in the circuit of ESP programing?

Posted: **Sat Jan 29, 2022 3:04 pm**

How are you powering the ESP32? Presumably you have a regulator somewhere? Where do you derive 3.3V ?

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