WSAL19806 – Pico-8SEG-LED/en

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 module provides a red, 0.4-inch, 4-digit 8-segment display with SPI-compatible driving via a 74HC595 shift register. It plugs directly onto the standard pin header of the Pico and requires a 5 V supply.

Related products at JW Tech

WSAL19806 – 4-digit 8-segment Display Module for Raspberry Pi Pico, SPI-compatible

Technical overview

Supply voltage: 5 V; operating current approx. 30 mA.
Display: 4 digits, red LEDs, negative circuit type, display part FJ4401AH.
Dimensions: 21(H) x 52.00(V) mm.
Wiring to the Pico: VCC to VSYS, GND to GND, DIN to GP11, CLK to GP10, RCLK to GP9.
The 74HC595 driver is an 8-bit shift register with parallel output latch; it needs separate clocks for shifting and latching.
For C development: build the project in the c/ folder (cmake + make), generate main.uf2 and copy it to the RPI-RP2 drive in BOOTSEL mode.
For MicroPython: use the Thonny IDE, flash firmware rp2-pico-20210418-v1.15.uf2, then run the sample file from the python/ folder.
DEV_Config.c provides GPIO and SPI helpers: DEV_Digital_Write/Read and DEV_SPI_WriteByte.

Commands and examples – verify before use:

sudo apt-get install p7zip-full
cd ~
sudo wget https://files.waveshare.com/upload/9/94/Pico-8SEG-LED-Code.7z
7z x Pico-8SEG-LED-Code.7z -o./Pico-8SEG-LED-Code
cd ~/Pico-8SEG-LED-Code/c/build/
export PICO_SDK_PATH=../../pico-sdk
cmake ..
make -j9
sudo apt upgrade thonny

Notes and version constraints

The exact pin assignments (GP9/GP10/GP11) are version-dependent on the Pico driver used and must be verified before soldering or wiring.
Firmware files such as rp2-pico-20210418-v1.15.uf2 or pico_micropython_20210121.uf2 must be available; flashing certain MicroPython firmwares on Pico2 can cause recognition issues.
Using Thonny requires an up-to-date version, since older versions lack Pico support.
On the first-time Arduino upload, the correct COM port must be selected; choosing the wrong port leads to errors.
The source contains outdated links and path names; all paths and URLs should be validated for validity before use.

Source and revision record

Pico-8SEG-LED - Waveshare Wiki
Source revision: 74174
Captured: 2026-09-02T02:55:38+00:00
SHA-256: dc4fca73f686c03f7c0dc843e8e050e8f93b79a32940547df76954275e6a016d