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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 to the Waveshare Pico-ePaper-7.5 (WSAL20128): a 7.5-inch black/white e-ink display with 800×480 resolution and an SPI interface, driven by the Raspberry Pi Pico.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL20128 WSAL20128 – 7.5inch E-Paper E-Ink Display Module for Raspberry Pi Pico, 800×480, Black / White, SPI]<br />
<br />
== Technical overview ==<br />
* Resolution: 800 × 480 pixels; colors: black/white (2 grey levels)<br />
* Interface: SPI (CPHL=0, CPOL=0, i.e. SPI mode 0); CS active-low, DC selects command/data<br />
* Operating voltage: 3.3 V; standby current &lt; 0.01 µA; refresh power ~26.4 mW (typ.)<br />
* Full refresh takes ~5 s; a normal flicker occurs during full refresh<br />
* Dimensions: raw panel 170.2 × 111.2 × 1.18 mm; driver board 65 × 31 mm; display area 163.2 × 97.92 mm; dot pitch 0.205 × 0.204 mm<br />
* Pico pinout: DIN→GP11 (MOSI), CLK→GP10 (SCK), CS→GP9, DC→GP8, RST→GP12, BUSY→GP13, VCC→VSYS, GND→GND<br />
* Two user buttons plus one reset button on the board for simple interaction<br />
* Pixel encoding: 1 bit per pixel (black = 0, white = 1), so 8 pixels per byte<br />
* Development code is in the Pico_ePaper_Code repository (C and MicroPython examples); the C project is built with CMake + Pico-SDK and flashed as a .uf2 file<br />
* E-paper uses MED technology (microencapsulated electrophoresis) without a backlight; it reflects ambient light, viewing angle 180°<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 />
sudo apt upgrade thonny<br />
</syntaxhighlight><br />
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== Notes and version constraints ==<br />
* Refresh time and power figures are test measurements; expect deviations depending on driver board and usage conditions<br />
* Brief flicker during a full refresh is normal<br />
* After deep sleep the display must be re-initialized in software; on first wake-up clear the screen first to avoid afterimages<br />
* If the program hangs in 'busy': check wiring and verify SPI settings (baud rate, mode)<br />
* The definition line in main.c must be adjusted for the specific e-paper type – select the 7.5-inch variant<br />
* No warranty, certification or pricing information appears in the source; do not add such values<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/Pico-ePaper-7.5 Pico e-Paper 7.5 - Waveshare Wiki]<br />
* Source revision: 104192<br />
* Captured: 2026-09-02T03:19:40+00:00<br />
* SHA-256: <code>4a4b16700328bc12f3e864106a843347dbea34517f4506578ceb82d3121e7aac</code></div>JWTechPublisher