T3-STM32 get it now

Overview

LILYGO T3-STM32 is a versatile IoT development board based on the STM32WL55CCU6 dual-core (Cortex-M4 + Cortex-M0+) low-power microcontroller with a built-in Sub-GHz radio (LoRa, FSK, BPSK). Supports 433/868/915 MHz multi-band LoRa for global deployment. Hardware includes 256 KB Flash, 64 KB SRAM, a 0.96-inch SSD1315 OLED (I2C), TF card slot (SPI), solar input (4.4–6 V), SWD debug interface, and QWIIC connectors. Suitable for remote monitoring, environmental sensing, LoRa gateways, and solar-powered IoT terminals.

Quick Start

Example Support

Example	PlatformIO/Arduino	ESP-IDF	Description
T3-STM32	✓		LED, OLED, SD card, SubGHz LoRa, deep sleep examples

Available examples

├── 1_led                  # Basic LED blink
├── 2_jlink_rtt_print      # J-Link RTT debug output
├── 3_sdcard               # TF card test
├── 4_oled                 # OLED display
├── 5_RF_test              # AT Slave for RF testing
├── 6_SubGHz_TXRX          # LoRa TX/RX test
├── DeepSleep              # Deep sleep power test
└── PingPong               # SubGHz Phy PingPong

STM32CubeIDE

1. Install STM32CubeIDE
2. Install STM32CubeProgrammer
3. Install debugger driver: ST-Link or J-Link
4. Connect the debugger to the board's 4-pin SWD interface
5. Open the project in STM32CubeIDE, compile and flash

PlatformIO

1. Install Visual Studio Code and Python
2. Search for and install the PlatformIO IDE extension in VS Code
3. Open the T3-STM32 project folder
4. Open platformio.ini, uncomment the example under [platformio]
5. Connect the debugger, click ✓ to compile, click → to upload

Development Platforms

1. STM32CubeIDE
2. Visual Studio Code
3. PlatformIO

Video

Key Features

• STM32WL55CCU6 dual-core Cortex-M4 + Cortex-M0+, built-in Sub-GHz radio
• LoRa (433/868/915 MHz) + FSK, GFSK, BPSK modulation
• 256 KB Flash + 64 KB SRAM
• 0.96-inch SSD1315 OLED (128 × 64), I2C
• TF card slot (SPI), solar input (4.4–6 V)
• 4-pin SWD debug interface
• 2 × QWIIC, 2.54mm 2×13 GPIO expansion

Product Parameters

Feature	Specification
MCU	STM32WL55CCU6 @ Dual-core Cortex-M4 + M0+
Flash	256 KB
SRAM	64 KB
Built-in Radio	LoRa, (G)FSK, (G)MSK, BPSK
LoRa Frequency	433 / 868 / 915 MHz
Display	0.96-inch SSD1315 OLED, 128 × 64, I2C
Storage	TF card slot (SPI)
USB	1 × Type-C
Solar Input	4.4–6 V
Debug	4-pin SWD interface
Expansion	2 × QWIIC, 2.54mm 2×13 GPIO
Antenna	LoRa antenna interface + 5-pin antenna socket
Buttons	RESET + BOOT
Mounting Holes	2 × M2
Dimensions	66 × 27 × 13 mm

Pin Diagram

Dimension Diagram

Schematic

• T3-STM32 V1.0 Schematic

Datasheet

• STM32WL55 Datasheet
• SSD1315 Datasheet
• SX1262 Datasheet

Software Development

• T3-STM32 GitHub Repository

Dependent Libraries

• STM32CubeWL HAL Library
• STM32CubeMX
• STM32WL LoRa Radio Driver

FAQ

• Q. Which debuggers are supported? A. Supports ST-Link and J-Link, connected via the 4-pin SWD interface.

• Q. What are the solar input requirements? A. Supports 4.4–6 V solar input, suitable for outdoor energy harvesting applications.

• Q. How to select LoRa frequency band? A. Three frequency versions are available: 433 MHz, 868 MHz, 915 MHz. Select per regional regulations.

Version History

Version	Release Date	Update Description
T3-STM32_V1.0	2024-07-30	Initial hardware version