Quelltext der Seite WSAL20123 – Pico-ePaper-3.7/en

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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.

== Summary ==
The Pico ePaper 3.7 is a 3.7-inch e-paper module for Raspberry Pi Pico/Pico2 with a resolution of 480 × 280 pixels and an SPI interface. It supports two or four grayscale levels, requires no backlight, and retains the last displayed image without power.

== Related products at JW Tech ==
* [https://shop.jw-tech.eu/p/WSAL20123 WSAL20123 – 3.7inch E-Paper E-Ink Display Module for Raspberry Pi Pico, 480×280, Black / White, 4 Grayscale, SPI]

== Technical overview ==
* Size: 3.7 inches; display area approx. 47.32 mm × 81.12 mm; module dimensions 56.9 mm × 95.3 mm
* Resolution 480 × 280 pixels at a pixel pitch of 0.169 mm
* Color mode: black/white, optionally four grayscale levels switchable via commands
* Operating voltage: 3.3 V / 5 V
* Interface: SPI (CPHL=0, CPOL=0, i.e., SPI mode 0)
* Partial refresh time approx. 0.3 s; full refresh approx. 3 s
* Refresh power typ. 26.4 mW; sleep current &lt; 0.01 µA
* Pin mapping: DIN→GP11, CLK→GP10, CS→GP9, DC→GP8, RST→GP12, BUSY→GP13
* Command/data control: DC = 0 → write command, DC = 1 → write data
* After leaving deep-sleep mode, the display must be re-initialized

'''Commands and examples – verify before use:''' 
<syntaxhighlight lang="text">
sudo wget https://files.waveshare.com/upload/5/5a/Pico_ePaper_Code.zip
git clone https://github.com/waveshare/Pico_ePaper_Code.git
cmake -DPICO_BOARD=pico -DPICO_PLATFORM=rp2040 ..
cmake -DPICO_BOARD=pico2 -DPICO_PLATFORM=rp2350 ..
make -j9
cp epd.uf2 /media/pi/RPI-RP2/
cp epd.uf2 /media/pi/RP2350
</syntaxhighlight>

== Notes and version constraints ==
* The stated refresh times are based on test data; actual times may vary depending on environment.
* Full refresh causes visible flickering – this is a normal effect of e-ink displays.
* After waking from deep-sleep mode, the display must first be cleared or re-initialized to avoid afterimages.
* For SPI communication issues: check wiring and verify SPI parameters (baud rate, mode).
* Switching between 2- and 4-grayscale modes requires sending specific register commands; exact command sequences must be verified in the driver code.

== Source and revision record ==
* [https://www.waveshare.com/wiki/Pico-ePaper-3.7 Pico e-Paper 3.7 - Waveshare Wiki]
* Source revision: 109417
* Captured: 2026-09-02T03:17:17+00:00
* SHA-256: <code>88e0b7fca3a447a5dd001bdf2c56754b6615c76e799826f5be089ff693fdc285</code>