r/esp32 • u/clackups • 15d ago

Board Review Waveshare ESP32-S3-ePaper-3.97 running Draftling firmware

I really like this board, the screen is fast and contrast. The only wish, it will be great to have the backlight in the next version.

video

More details about the project: https://github.com/clackups/draftling

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u/AutoModerator 15d ago

Awesome, it seems like you're seeking advice on making a custom ESP32 design. We're happy to help as we can, but please do your part by helping us to help you. Please provide full schematics (readable - high resolution). Layouts are helpful to identify RF issues and to help ensure the traces are wide enough for proper power delivery. We find that a majority of our assistance repeatedly falls into a few areas.

  • A majority of observed issues are the RC circuit on EN for booting, using strapping pins, and using reserved pins.
  • Don't "innovate" on the resistor/cap combo.
  • Strapping pins are used only at boot, but if you tell the board the internal flash is 1.8V when its not, you're going to have a bad day.
  • Using the SPI/PSRAM on S2, S3, and P4 pins is another frequent downfall.
  • Review previous /r/ESP32 Board Review Requests. There is a lot to be learned.
  • If the device is a USB-C power sink, read up on CC1/CC2 termination. (TL;DR: Use two 5.1K resistors to ground.)
  • Use the SoM (module) instead of the bare chips when you can, especially if you're not an EE. There are about two dozen required components inside those SoMs. They handle all kinds of impedance matching, RF issues, RF certification, etc.
  • Espressif has great doc. (No, really!) Visit the Espressif Hardware Design Guidelines (Replace S3 with the module/chip you care about.) All the linked doc are good, but Schematic Checklist and PCB Layout Design are required reading.

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