Cannot detect ESP32-C3 module via USB

[tuanhh]

Hi everyone,

I'm learning to use ESP32-C3 module and have created a PCB sample with the schematic in the attachment.

The LDO converting 5V to 3.3V was just fine and I can measure 3.3V at the output.

However, with both GPIO9 as pull up or pull down to GND, I was not able to get computer to detect this ESP32-C3 at all.

I have been trying to diagnose for a while now but cannot find the result.

Just in case, the ESP32-C3 modules are from Digikey: https://www.digikey.com.au/en/products/ ... 4/13877574

[Sprite]

Can you access TXD0 and do you see any activity on there? Also, what power source and LDO are you using?

[tuanhh]

Hi ESP_Sprite,

I don't have access to TXD0, but I might have to find a way to get access to it. What should I expect from the TXD0 when booting the ESP32-C3 up for the first time? Would it be some bootloader log?

Regarding power source, I'm powering the board via USB port, the 5V to 3.3V LDO is TLV76733DRVR and it provides 3.3V correctly.

The EN pin from the LDO, which is also labelled as BUCK_PG, was just ignored, as it has internal pulled up.

The LED indicating 3.3V power source is turned ON just fine.

What do you think?

[tuanhh]

Hi ESP_Sprite,

Another update, it turned out to be that I didn't apply an equal amount of solder paste to all the pins, leading to some pins being left unconnected during soldering process.

So all good now.

Thank you!