Review Request For ESP32 Board

RaptorHunter
Posts: 2
Joined: Thu Sep 09, 2021 8:35 am

Review Request For ESP32 Board

Postby RaptorHunter » Thu Sep 09, 2021 9:53 am

Hi everyone, I put this together, can you check if everything it's OK?
It's a board to drive 2 4W 3535 RGBW LED ceiling starlight wired in series, a 28BYJ-48 that makes the star twinkle effect, and LED strips around the ceiling.
https://oshwlab.com/farukcorreia/esp32-led-stepper
Schematic_ESP32 LED + Stepper + RGB Strip_2021-09-09.png
Schematic_ESP32 LED + Stepper + RGB Strip_2021-09-09.png (214.35 KiB) Viewed 379 times

ESP_Sprite
Posts: 5164
Joined: Thu Nov 26, 2015 4:08 am

Re: Review Request For ESP32 Board

Postby ESP_Sprite » Fri Sep 10, 2021 1:24 am

What kind of ESP32 board plugs into that? Most common pins don't need 3.3V when you power them using 5V; they have their own onboard LDOs to generate 3.3V. Also, the ESP32 GPIOs are officially *not* 5V-compatible; you may want to connect R1, R6, R7 etc to 3.3V instead of 5V. In this light, you may also want to change the mosfets there to logic-level ones that solidly open when the gate voltage is 3.3V (although I think these may also work OK here.)

Suggest you also look in the datasheet of whatever DC/DC converters you want to use; some require extra capacitors on the input/outputs to work.

RaptorHunter
Posts: 2
Joined: Thu Sep 09, 2021 8:35 am

Re: Review Request For ESP32 Board

Postby RaptorHunter » Fri Sep 10, 2021 5:28 am

Hi Thanks, I am planing to use the board with 36 pins, as for the DC-DC converters I am planing to use breakout boards.
Some suggested I remove the pullups.

ESP_Sprite
Posts: 5164
Joined: Thu Nov 26, 2015 4:08 am

Re: Review Request For ESP32 Board

Postby ESP_Sprite » Sat Sep 11, 2021 3:08 am

You could. The pullups have the effect of making the LEDs turn on if the ESP32 is still initializing; I assumed that was what you were going for. If not, I'd replace them with pulldowns (and increase the value to say 10K), that way you can't accidentally turn the mosfets 'half-on' and burn them up.

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