Midi LED Matrix Sequencer

A compact studio desktop MIDI-controlled 16x16 LED matrix sequencer powered by dual 18650 batteries with USB programming and TRS MIDI/SYNC interfaces.

Design Overview

Item	Details
Product Type	Midi LED Matrix Sequencer
Key Functions	16x16 WS2812B LED matrix driving over SPI, MIDI input via 3.5mm TRS jack, SYNC input for musical synchronization via 3.5mm TRS jack, Rechargeable dual 18650 Li-Ion battery power with power switch, USB interface for microcontroller programming and serial communication
Power Source	Dual 18650 Li-Ion Battery with USB Charging
Connectivity	USB, MIDI TRS, SYNC TRS
Size	Compact desktop enclosure
Environment	Studio desktop
Difficulty	Intermediate
Est. Time	4-6 hours

System Architecture

Power Topology: USB-C 5V → MCU 3.3V LDO

Module List

Module ID	Type	Name	Function	Voltage
POWER	POWER	USB-C Power Jack	Power input	5V
MCU	MCU	ESP32-WROOM-32	Main controller	3.3V

Design Schemes

Midi LED Matrix Sequencer ★

Key IC selection

main MCU and matrix controller

• Need: Dual-core processing, Wi-Fi/BT optional, sufficient RAM for framebuffer, hardware UART for MIDI, and high-speed DMA for WS2812B timing.
• Class: 32-bit Wi-Fi/BLE MCU with rich peripherals
• Shortlist: ESP32-WROOM-32, ESP32-S3-WROOM-1
• Pick: Select ESP32-WROOM-32 module with integrated flash based on cost and robust peripheral availability.

Battery Management and Power Path

• Need: Safe charging for dual 18650 cells in parallel, USB-C power input handling, and high-current 5V boost converter for 256 WS2812B LEDs at peak brightness.
• Class: 1-cell Li-Ion Battery Charger + Synchronous Boost DC-DC Regulator
• Shortlist: BQ25606 + TPS61088, MP2639A dual-cell charger/boost IC
• Pick: Select monolithic dual-cell synchronous switch-mode charger and boost converter to minimize PCB footprint and handle high LED transient currents.

Risk register

ID	Area	Severity	Detail	Mitigation
r1	power	high	256 WS2812B LEDs at full white draw upwards of 15A peak, which will cause severe voltage drop on a dual 18650 battery setup and trigger over-current protection or cause MCU resets.	Implement strict firmware brightness limiting, add bulk capacitance (low-ESR electrolytic + ceramic array) near the LED power distribution, and run thick copper power planes.
r2	thermal	med	High sustained LED density in a compact enclosure will trap heat, potentially degrading battery life and causing thermal stress on linear regulators or power switches.	Incorporate thermal vias under the power ICs, ensure proper ventilation paths in the enclosure design, and add a dynamic thermal throttling routine in firmware.
r3	emi	med	High-frequency PWM signals driving 256 WS2812B data lines act as antenna arrays, potentially corrupting sensitive optoisolated MIDI input streams.	Route MIDI optoisolator circuitry away from the LED data lines, use shielded 3.5mm jacks, and add series damping resistors (33-100 ohm) on ESP32 LED data output pins.

Key Components

2/2 modules matched to real parts. See the BOM tab for the full component table.

USB-C Power Jack (UJ20-C-H-G-MSMT-P16-TR)

None of the candidates match the primary MPN UJ20-C-H-G-MSMT-4B-P16-TR closely enough, as they all have different featur

ESP32-WROOM-32 (ESP32-WROOM-32)

Candidate 2 exactly matches the primary MPN 'ESP32-WROOM-32' and is manufactured by Espressif Systems.

Build Summary

• Difficulty: Intermediate
• Estimated time: 4-6 hours
• Tools required: Soldering Iron, Lead-free Solder, Flux, Digital Multimeter, Wire Strippers, Flush Cutters

See the Build tab for the full step-by-step assembly guide.

---

Generated by YuanQi AI Design System · Query: 16x16 LED Matrix Driver with appropriate microcontroller. Matrix is over SPI. Must have MIDI and SYNC IN for musical purposes. Power switch, rechargeable using 18650 cells. USB Interface to program and talk to microcontroller.