Cant upload program to esp32 using my custom circuit

[Richu Bini]

Showing this message from serial monitor .... i have used an arduino as a TTL module by shorting the GND and reset pin

when i tried to upload the code it is showing this error

This is the schematic i used

[salmanfaris]

Hi @Richu-Bini , What kind of UART/FTDI programmer you are using? Could also share the connection diagram to the module with the programmer?

and in the diagram I see, you already twisted Rx and Tx, so you should connect the FTDI with the module Esp32 Rx - FTDI Rx and Esp32 TX - FTDI TX.

[Richu Bini]

@Richu-Bini am using an Arduino uno as ttl module

[aneeshprasobhan]

@Richu-Bini I'm not sure if this is the root cause but normally, you should add an RC delay on the EN pin. This is because the BOOT pin should reach 3.3V before the EN reaches 3.3V hence, the RC delay on the EN pin. A 10K resistor and a 1μF Cap should do it. Here's a sketch on how it should look like:

Here is the part in the datasheet of the WROOM32 that tells you to do it: