Minimum ESP32 circuit required for runtime

WoolySheep
Posts: 15
Joined: Wed Jan 06, 2021 9:46 am

Minimum ESP32 circuit required for runtime

Postby WoolySheep » Sun Dec 18, 2022 7:30 pm

Hi all,

I normally use an 'ESP32 Dev Kit C' for my projects. This time I want to create a PCB and solder an ESP32-Wroom-32D chip direct to it. This will make my project much smaller.

So, I have bought 5 of the below:
ESP32.jpg
ESP32.jpg (48.28 KiB) Viewed 1484 times
Then, I made the below circuit as I think it is the most basic that I need to be able to upload code.
ESP32-Minimum.jpg
ESP32-Minimum.jpg (476.58 KiB) Viewed 1484 times
The USB TTL Interface has a built-in AMS1117 3.3v regulator in it.

Can people please tell me if the above circuit will work.

Many thanks
Alan

ESP_Sprite
Posts: 9709
Joined: Thu Nov 26, 2015 4:08 am

Re: Minimum ESP32 circuit required for runtime

Postby ESP_Sprite » Mon Dec 19, 2022 2:03 am

You need at least a power-on reset RC network on your EN pin. Given that you have an 10K pullup already, simply add an 1uF between ground and EN and that should be fixed.

WoolySheep
Posts: 15
Joined: Wed Jan 06, 2021 9:46 am

Re: Minimum ESP32 circuit required for runtime

Postby WoolySheep » Mon Dec 19, 2022 7:53 am

Hi @ESP_Sprite, thank you for your help. So, how is the below now?

ESP32(1).jpg
ESP32(1).jpg (421.18 KiB) Viewed 1407 times
Many thanks
Alan

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