LILYGO T-Keyboard S3 Pro

A host device is required for operation. The module connects to the host via a magnetic interface.

Introduction

T-Keyboard-S3 Pro is a high-end programmable keyboard based on a dual-MCU architecture (ESP32-S3 + STM32G030F6P6), designed for developers and professional users.

Key highlights include:

Four 0.85-inch RGB LCD screens (128x128 resolution), capable of independently displaying shortcut commands, system status, or dynamic interactive interfaces. Driven via SPI interface (MOSI/SCLK), these screens enable efficient visual interaction.

Four hot-swappable mechanical keys, compatible with custom switches, combined with RGB WS2812 lighting effects and a rotary encoder (Data-A/B pins), supporting programmable backlight modes and precise parameter adjustments (e.g., volume, scrolling control).

On the hardware side:

The ESP32-S3 main controller features 8MB Flash and 16MB PSRAM, supporting Wi-Fi/Bluetooth communication and complex logic processing.

An external STM32 chip assists in real-time input handling via the I2C bus (SDA: IO06/IO42, SCL: IO07/IO02), ensuring low-latency response.

For expansion, the board offers STEMMA QT/Qwiic, JST-SH 4-PIN interface, and support for up to 5 I2C slave devices, allowing connection to sensors, touchpads, and other peripherals to build a multifunctional control terminal.

Appearance and function introduction

Appearance

Pinmap

Module Information and Specifications

Description

1.The default firmware is configured for I2C communication expansion mode. Please note that to expand the number of slave devices, each device must have a unique I2C address to avoid address conflicts. Slave devices cannot operate independently; they must be used in a system where one master communicates with multiple slaves.

2.Up to six devices can be connected. When using multiple devices, the maximum brightness of the onboard LED should be reduced to 10。

3.Due to limitations in hardware long-trace routing, there are certain constraints on expansion directions. Only one device can be expanded on each side (left and right) of the main board, and a maximum of two devices can be added below (as the USB port blocks further expansion).
Therefore, a 2x3 grid layout is the maximum supported configuration, allowing a total of six devices.

Development Board Specifications

Related Links

Github：T-Keyboard S3 Pro

• ESP32­-S3-WROOM­-1
• STM32G030F6P6
• GC9107
• WS2812C

Schematic Diagram

T-Keyboard S3 Pro

Dependency Libraries

• RadioLib
• TFT_eSPI
• LVGL
• Arduino_GFX

Software Design

Arduino Set Parameters

Development Platform

1. ESP-IDF
2. Arduino IDE

Product Technical Support