Topics created by Richu Bini

@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:
RC delay on ESP.jpg

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

😀 👍 . solved right?

Hi @Richu-Bini, The Uart Baud Rate Register (UBRR) is used to set the clock for the UART shift registers and For standard crystal and resonator frequencies, the most commonly used baud rates for asynchronous operation can be generated by using the UBRR settings provided by the AVR Datasheet: AVR306: Using the AVR USART on tinyAVR and megaAVR devices

And you can find the equation from the datasheet to calculate the UBRR values depends on the clock source it has.

8422ea95-2844-483c-8e41-acab03c9ec41-image.png more details at the AVR306: Using the AVR USART on tinyAVR and
megaAVR devices

alt text src: http://www.avrbeginners.net/architecture/uart/uart.html#baud_generator

resource:

thank youu