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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 />
Technical overview of the 2.9-inch E-Ink display with 296×128 pixels, SPI interface and four grayscale levels.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL19408 WSAL19408 – 2.9inch E-Paper E-Ink Display Module for Raspberry Pi Pico, 296×128, Black / White, SPI]<br />
<br />
== Technical overview ==<br />
* Resolution: 296 × 128 pixels; screen diagonal approx. 2.9 inches.<br />
* Active area: 66.89 mm × 29.05 mm; raw panel outline 79.0 mm × 36.7 mm × 1.05 mm; with driver board 82.0 mm × 38.0 mm.<br />
* Interface: SPI mode CPHL=0, CPOL=0 (SPI0); CS active-low, DC selects command/data.<br />
* Operating voltage: 3.3 V / 5 V; standby current below 0.01 µA; refresh power typically 26.4 mW.<br />
* Refresh times: partial about 0.6 s; full about 3 s; flickering during global refresh is a normal phenomenon.<br />
* Pixel rendering: monochrome: 0 = black, 1 = white; one byte stores eight pixels.<br />
* Four grayscale levels: black 00b, dark grey 10b, light grey 01b, white 11b; two bits per pixel.<br />
* Two frame-buffer registers (0x24 and 0x26) are combined to produce the four grayscale values.<br />
* Hardware wiring to Pico/Pico 2 via 8-pin cable: VCC→VSYS, GND→GND, DIN→GP11, CLK→GP10, CS→GP9, DC→GP8, RST→GP12, BUSY→GP13.<br />
* Demo code is available as a ZIP or Git repository; the C project is built with CMake and make, producing epd.uf2.<br />
<br />
'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
cd ~<br />
sudo wget https://files.waveshare.com/upload/5/5a/Pico_ePaper_Code.zip<br />
unzip Pico_ePaper_Code.zip -d Pico_ePaper_Code<br />
cd ~/Pico_ePaper_Code<br />
git clone https://github.com/waveshare/Pico_ePaper_Code.git<br />
mkdir build<br />
export PICO_SDK_PATH=../../pico-sdk<br />
cmake -DPICO_BOARD=pico -DPICO_PLATFORM=rp2040 ..<br />
make -j9<br />
cp epd.uf2 /media/pi/RPI-RP2/<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* The stated refresh times and power figures are experimental measurements; real-world deviations are possible.<br />
* Flickering occurs during global refresh – this is a normal phenomenon, not a fault.<br />
* After waking from deep sleep, the display must be re-initialized and cleared first to avoid afterimages.<br />
* Four-grayscale display is only supported by full refresh; partial refresh does not show four-gray-scale output.<br />
* The exact line in main.c that must be uncommented depends on the specific display type; verify before compiling.<br />
* The demo code instructions reference external links (Raspberry Pi docs, Waveshare files) whose availability is not guaranteed.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Pico-ePaper-2.9 Pico e-Paper 2.9 - Waveshare Wiki]<br />
* Source revision: 109821<br />
* Captured: 2026-09-01T04:14:41+00:00<br />
* SHA-256: <code>22e3ddb1e0671f554b87d4be1fcba544b33ed7693cb67fe583425b32d13bedbe</code></div>JWTechPublisher