An 8x32 LED matrix driven by Blynk over MQTT

Jonathan Lon Hackster.io

A Python host streams 60 FPS RGB frames over UDP to a W55MH32L board, which pushes them into a WS2812B matrix. Blynk on your phone picks the animation and sends scrolling text.

Build sheet

Receiver: W55MH32L-EVB
Display: 8x32 WS2812B matrix
Host: Python
Control: Blynk app over MQTT

Can I build this?Intermediate · AI 4/5 · $40–80

Difficulty: Intermediate
AI-buildability: 4/5
Time: A weekend
Cost: $40–80

Parts

W55MH32L-EVB 8x32 WS2812B flexible LED matrix MOSFET switch module Button Module Relay Module (Generic)

Tools

soldering ironmultimeter

Starter prompt

Based on "An 8x32 LED matrix driven by Blynk over MQTT" on Afterware: https://afterware.xyz/p/an-8x32-led-matrix-driven-by-blynk-over-mqtt

Write a Python host that streams 60 FPS RGB frames over UDP to an microcontroller driving an 8x32 WS2812B LED matrix. Include animations (plasma, rainbow, waves, checker, solid), a 5x7 font horizontal text scroller, and NTP time sync for a digital clock. Subscribe to Blynk MQTT topics to switch animation, send text, and set speed and brightness.

Estimates based on the original write-up. How AI-buildability is scored. Building with an AI assistant? Connect it to Afterware (free MCP server).

Story

The IR receiver kept dying. Blocking OLED updates and UDP traffic threw off the timing on the receiver's signal pin, so the author gave up on IR and moved control to MQTT through Blynk's phone app.

The build splits the work. A Python host handles NTP time sync, animation math and user input, then streams raw 60 FPS RGB frames over UDP. A W55MH32L-EVB receives the 768-byte frame buffers over hardwired Ethernet and drives 256 WS2812B LEDs in an 8x32 flexible matrix. Blynk's virtual pins control animation, scrolling text, speed (0.2x to 3.0x) and brightness.

The clock trick is worth stealing. The host queries pool NTP servers for sub-second time, so the digital clock needs no RTC module. A MOSFET switches the matrix's 5V supply from a GPIO, and the write-up walks through the wiring and the Blynk template setup.

Resources · 2

Firmware repo Part 1 (hardware and LED matrix)