Zum Inhalt springen

WSAL20344 – Pico-ePaper-4.2/en

Aus JW Tech Wiki

Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The Waveshare Pico e-Paper 4.2 is a 4.2-inch e-Ink module with 400×300 pixels and an SPI interface for the Raspberry Pi Pico/Pico 2. It supports black/white plus four grayscale levels, requires only a few GPIO pins, and features very low power consumption.

Related products at JW Tech

Technical overview

  • Resolution: 400 × 300 pixels on a 4.2-inch diagonal; pixel pitch 0.212 mm × 0.212 mm.
  • Display: black/white screen with additional support for four grayscale levels (black, dark gray, light gray, white).
  • Interface: SPI (MOSI→GP11, SCK→GP10, CS→GP9, DC→GP8); additionally RST on GP12 and BUSY on GP13.
  • Power: 3.3 V or 5 V via an onboard voltage translator; sleep current below 0.01 µA, refresh power about 26.4 mW (typ.).
  • Dimensions: bare screen 90.1 × 77.0 × 1.18 mm; driver board 93.5 × 78.5 mm; active display area 84.8 × 63.6 mm.
  • Full refresh takes about 4 s; the process may flicker slightly – this is normal.
  • Two user buttons are onboard; the last displayed image persists after power-off (no backlight required).
  • Example code is available in C (pico-sdk/cmake/make) and MicroPython (Thonny IDE); demo files are flashed via the USB RPI-RP2 drive.

Commands and examples – verify before use:  

cd ~ && sudo wget https://files.waveshare.com/upload/5/5a/Pico_ePaper_Code.zip && unzip Pico_ePaper_Code.zip -d Pico_ePaper_Code && cd ~/Pico_ePaper_Code
git clone https://github.com/waveshare/Pico_ePaper_Code.git && cd ~/Pico_ePaper_Code
cd ~/Pico_ePaper_Code/c && mkdir build && cd build && export PICO_SDK_PATH=../../pico-sdk && cmake -DPICO_BOARD=pico -DPICO_PLATFORM=rp2040 .. && make -j9
cp epd.uf2 /media/pi/RPI-RP2/

Notes and version constraints

  • Line numbers cited in the source (e.g., “line 18” in main.c) may vary between example-code versions; verify the correct #define selection before compiling.
  • The stated refresh time and power values are test measurements; real-world values can differ depending on environment.
  • The full-refresh process produces brief flickering – according to the source this is a normal phenomenon, not a fault.
  • For Pico 2, switch the build to pico2/rp2350 and use firmware rp2-pcio2-20240809-v1.24.0.uf2.
  • No warranty, certification, or pricing information appears in the source material; these items must be verified separately.

Source and revision record

  • Pico e-Paper 4.2 - Waveshare Wiki
  • Source revision: 69242
  • Captured: 2026-09-02T03:44:11+00:00
  • SHA-256: ceb20833627661cdb202117e147b1535fe4ab7a0169068b3b4e9bfb0fb5d8143
Abgerufen von „https://wiki.jw-tech.eu/index.php?title=WSAL20344_–_Pico-ePaper-4.2/en&oldid=1482“