https://wiki.jw-tech.eu/index.php?action=history&feed=atom&title=WSAL20344_%E2%80%93_Pico-ePaper-4.2%2FenWSAL20344 – Pico-ePaper-4.2/en - Versionsgeschichte2026-10-23T23:56:22ZVersionsgeschichte dieser Seite in JW Tech WikiMediaWiki 1.43.9https://wiki.jw-tech.eu/index.php?title=WSAL20344_%E2%80%93_Pico-ePaper-4.2/en&diff=1482&oldid=prevJWTechPublisher: Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex2026-09-05T22:30:48Z<p>Freigegebene technische Dokumentation veröffentlicht; Text-only und noindex</p>
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'''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.<br />
<br />
== Summary ==<br />
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.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL20344 WSAL20344 – 4.2inch E-Paper E-Ink Display Module for Raspberry Pi Pico, 400×300, Black / White, 4 Grayscale, SPI]<br />
<br />
== Technical overview ==<br />
* Resolution: 400 × 300 pixels on a 4.2-inch diagonal; pixel pitch 0.212 mm × 0.212 mm.<br />
* Display: black/white screen with additional support for four grayscale levels (black, dark gray, light gray, white).<br />
* Interface: SPI (MOSI→GP11, SCK→GP10, CS→GP9, DC→GP8); additionally RST on GP12 and BUSY on GP13.<br />
* 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.).<br />
* 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.<br />
* Full refresh takes about 4 s; the process may flicker slightly – this is normal.<br />
* Two user buttons are onboard; the last displayed image persists after power-off (no backlight required).<br />
* Example code is available in C (pico-sdk/cmake/make) and MicroPython (Thonny IDE); demo files are flashed via the USB RPI-RP2 drive.<br />
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'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
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<br />
git clone https://github.com/waveshare/Pico_ePaper_Code.git && cd ~/Pico_ePaper_Code<br />
cd ~/Pico_ePaper_Code/c && mkdir build && cd build && export PICO_SDK_PATH=../../pico-sdk && cmake -DPICO_BOARD=pico -DPICO_PLATFORM=rp2040 .. && make -j9<br />
cp epd.uf2 /media/pi/RPI-RP2/<br />
</syntaxhighlight><br />
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== Notes and version constraints ==<br />
* 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.<br />
* The stated refresh time and power values are test measurements; real-world values can differ depending on environment.<br />
* The full-refresh process produces brief flickering – according to the source this is a normal phenomenon, not a fault.<br />
* For Pico 2, switch the build to pico2/rp2350 and use firmware rp2-pcio2-20240809-v1.24.0.uf2.<br />
* No warranty, certification, or pricing information appears in the source material; these items must be verified separately.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Pico-ePaper-4.2 Pico e-Paper 4.2 - Waveshare Wiki]<br />
* Source revision: 69242<br />
* Captured: 2026-09-02T03:44:11+00:00<br />
* SHA-256: <code>ceb20833627661cdb202117e147b1535fe4ab7a0169068b3b4e9bfb0fb5d8143</code></div>JWTechPublisher