---
date: 2026-08-05
type: project
status: active
hardware: XIAO ESP32-C3 + Waveshare Pico ePaper 4.2
tags: [electronics, esp32, epaper, driver]
---

# Electronics - XIAO ESP32-C3 + Waveshare Pico ePaper

## Hardware
- XIAO ESP32-C3 (RISC-V)
- Waveshare Pico ePaper 4.2 (400x300 B/W SPI, 2-color)
- Prior C driver: Gitea adolforeyna/basic1
- Target: KidsOS / Tactility stable grayscale UI

## Display Driver Preference
- Stable pseudo-grayscale: clean full black/white reset + 5 selective fast partial passes
- White stays white, intermediate black drives distributed to avoid ghosting
- Avoid harsh black / ghosting — soft pencil aesthetic similar to reMarkable
- Method: full clean -> 5x selective fast partial passes distributed

## SPI Wiring
- Verify against Waveshare wiki: BUSY, RST, DC, CS, CLK, DIN + VCC/GND

## Related
- tactility_humation_mit_avatars_2026.md
- paper_apps_golf_galaxy_zero_2026.md — grid puzzles ideal for ePaper

## Next
- [ ] Port stable 5-pass grayscale method
- [ ] Test with XIAO SPI wiring
- [ ] Render Paper Apps GOLF tile on ePaper

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