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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 guide for the Waveshare 2.9-inch e-paper touch module for Raspberry Pi Pico.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL20051 WSAL20051 – 2.9inch Touch e-Paper Module for Raspberry Pi Pico, 296×128, Black / White, SPI]<br />
<br />
== Technical overview ==<br />
* Resolution 296 × 128 pixels; black/white with four-grayscale support on full refresh.<br />
* Interface: SPI (CPHL=0, CPOL=0, SPI0); touch via I2C at address 0x48.<br />
* Operating voltage 3.3 V / 5 V; standby current below 0.01 µA.<br />
* Full refresh takes about 3 s; partial refresh about 0.6 s; refresh power typically 26.4 mW.<br />
* Capacitive touch with up to 5 touch points on a toughened glass panel.<br />
* Pico pinout: DIN→GP11, CLK→GP10, CS→GP9, DC→GP16? No—DC→GP8, RST→GP12, BUSY→GP13; touch: TRST→GP16, INT→GP17, SDA→GP6, SCL→GP7.<br />
* Pixel encoding: 1 bit per pixel (0 = black, 1 = white); 1 byte represents 8 pixels.<br />
* Four grayscale is implemented using two image layers; register values 0x24 and 0x26 together define each pixel's gray level.<br />
<br />
'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
cd ~ && wget https://files.waveshare.com/upload/5/5a/Pico_CapTouch_ePaper.zip && unzip Pico_ePaper_CapTouch.zip -d Pico_ePaper_CapTouch<br />
git clone https://github.com/waveshare/Pico_CapTouch_ePaper<br />
mkdir build && cd build && export PICO_SDK_PATH=../../pico-sdk && cmake -DPICO_BOARD=pico -DPICO_PLATFORM=rp2040 .. && make -j6<br />
cp epd.uf2 /media/pi/RPI-RP2/<br />
sudo apt upgrade thonny<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* The listed refresh times and power figures are experimental measurements; actual values may vary.<br />
* A brief flicker can occur during a full refresh – this is normal.<br />
* After waking from deep-sleep mode, the display must be re-initialized and the screen cleared first to minimize afterimages.<br />
* Four-grayscale functionality works only on full refresh; partial refresh does not support grayscale.<br />
* E-paper reflects ambient light and needs no backlight; direct sunlight is not supported.<br />
* If the program stalls on “busy”: check wiring, SPI baud rate and mode settings.<br />
* The provided GitHub link references a repository named Pico_CapTouch_ePaper; verify the exact repository name in a browser before cloning.<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Pico-CapTouch-ePaper-2.9 Pico-CapTouch-ePaper-2.9 - Waveshare Wiki]<br />
* Source revision: 109395<br />
* Captured: 2026-09-02T03:10:04+00:00<br />
* SHA-256: <code>aefcac3cd6944fb9078103f1ecc08cb7369e97413eadfa9a87b2b541a3076bbd</code></div>JWTechPublisher