T3-S3 V1.3 get it now
Overview
LILYGO T3-S3 V1.3 is an updated revision of the T3-S3, based on the ESP32-S3FH4R2 dual-core LX7 microcontroller with multi-band LoRa communication. It can be optionally configured with SX1262/SX1276/SX1278 (433/868/915 MHz) or SX1280 (2.4 GHz) LoRa modules, supporting long-distance low-power communication. Features an onboard 0.96-inch SSD1306 OLED (128 × 64), MicroSD (TF) card slot, and USB-C for power and programming. Compared to V1.2, V1.3 includes hardware optimization and improved layout. Fully supported by the Meshtastic firmware for off-grid mesh networking.
Quick Start
Example Support
| Example | PlatformIO/Arduino | ESP-IDF | Description |
|---|---|---|---|
| LilyGo-LoRa-Series | ✓ | LoRa, OLED, SD Card, LoRaWAN examples |
Available examples
./examples/
├── ArduinoLoRa # SX1276/SX1278 only
├── GPS # T-Beam GPS examples
├── LoRaWAN # LMIC_Library_OTTA, RadioLib_OTAA
├── OLED # SSD1306/SH1106 display examples
├── RadioLibExamples # SX1276/78/62/80 Transmit/Receive
├── T3S3Factory # T3-S3 factory test
└── Factory # Factory test examplesPlatformIO
- Install Visual Studio Code and Python
- Search for and install the PlatformIO IDE extension in VS Code
- Open the
LilyGo-LoRa-Seriesproject folder - Open
platformio.ini, underdefault_envsuncomment your board name - Click ✓ to compile, connect via USB-C, click → to upload
Arduino
- Install Arduino IDE
- Install Arduino ESP32
- Copy all folders from the
libdirectory to your Arduino libraries folder:- Windows:
C:\Users\{Username}\Documents\Arduino - macOS:
/Users/{Username}/Documents/Arduino - Linux:
/home/{Username}/Arduino
- Windows:
- Open the example
.inofile from theexamplesdirectory - In Tools → Board, configure:
| Arduino IDE Setting | Value |
|---|---|
| Board | LilyGo T3-S3 |
| Port | Your port |
| USB CDC On Boot | Enable |
| CPU Frequency | 240 MHz (WiFi) |
| Core Debug Level | None |
| USB DFU On Boot | Disable |
| Erase All Flash Before Sketch Upload | Disable |
| Events Run On | Core1 |
| Arduino Runs On | Core1 |
| USB Firmware MSC On Boot | Disable |
| Partition Scheme | Default 4MB with spiffs (1.2MB APP/1.5MB SPIFFS) |
| PSRAM | QSPI PSRAM |
| Board Revision | Select per your actual model |
| Upload Mode | UART0/Hardware CDC |
| Upload Speed | 921600 |
| USB Mode | CDC and JTAG |
| Programmer | Esptool |
- Click Upload
If upload fails: hold BOOT, press RST, release RST, then click Upload.
Development Platforms
Related Videos
Key Features
- ESP32-S3FH4R2 dual-core LX7 @ 240 MHz, Wi-Fi + Bluetooth 5.0
- SX1262 / SX1276 / SX1278 (433/868/915 MHz) or SX1280 (2.4 GHz) LoRa — optional
- 0.96-inch SSD1306 OLED (128 × 64), I2C
- 4 MB Flash + 2 MB QSPI PSRAM + TF card slot
- USB-C power and programming
- Battery switch, supports 3.7 V Li-Po battery
- 2 × QWIIC interfaces, 2.54 mm 2×13 GPIO expansion
- Meshtastic compatible
Specifications
| Parameter | Value |
|---|---|
| SOC | ESP32-S3FH4R2, Dual-core LX7 @ 240 MHz |
| Flash | 4 MB (Quad-SPI) |
| PSRAM | 2 MB (Quad-SPI) |
| Wireless | Wi-Fi 2.4 GHz 802.11 b/g/n, Bluetooth 5.0 |
| LoRa | SX1262 / SX1276 / SX1278 (433/868/915 MHz) or SX1280 (2.4 GHz) |
| Display | 0.96-inch SSD1306 OLED, 128 × 64, I2C |
| Storage | TF card slot (SPI) |
| USB | 1 × USB-C |
| Expansion | 2 × QWIIC, 2.54 mm 2×13 GPIO |
| Buttons | RESET + BOOT |
| Battery | 3.7 V Li-Po (with battery switch) |
| Mounting Holes | 2 × M2 |
| Dimensions | 66 × 36 × 14 mm |
| Weight | |
| Package size |
Pin Diagram
SX1262 Pin Mapping
| Signal | GPIO | Available |
|---|---|---|
| QWIIC Uart1 TX | 43 | ✅ |
| QWIIC Uart1 RX | 44 | ✅ |
| QWIIC IO10 | 10 | ✅ |
| QWIIC IO21 | 21 | ✅ |
| I2C SDA | 18 | ❌ |
| I2C SCL | 17 | ❌ |
| SD CS | 13 | ❌ |
| SD MOSI | 11 | ❌ |
| SD MISO | 2 | ❌ |
| SD SCK | 14 | ❌ |
| LoRa SCK | 5 | ❌ |
| LoRa MISO | 3 | ❌ |
| LoRa MOSI | 6 | ❌ |
| LoRa RESET | 8 | ❌ |
| LoRa DIO1 | 33 | ❌ |
| LoRa BUSY | 34 | ❌ |
| LoRa CS | 7 | ❌ |
| BOOT Button | 0 | ❌ |
| Battery ADC | 1 | ❌ |
| Onboard LED | 37 | ❌ |
SX1276 / SX1278 Pin Mapping
| Signal | GPIO | Available |
|---|---|---|
| QWIIC Uart1 TX | 43 | ✅ |
| QWIIC Uart1 RX | 44 | ✅ |
| QWIIC IO10 | 10 | ✅ |
| QWIIC IO21 | 21 | ✅ |
| I2C SDA | 18 | ❌ |
| I2C SCL | 17 | ❌ |
| SD CS | 13 | ❌ |
| SD MOSI | 11 | ❌ |
| SD MISO | 2 | ❌ |
| SD SCK | 14 | ❌ |
| LoRa SCK | 5 | ❌ |
| LoRa MISO | 3 | ❌ |
| LoRa MOSI | 6 | ❌ |
| LoRa RESET | 8 | ❌ |
| LoRa DIO0 | 9 | ❌ |
| LoRa DIO1 | 33 | ❌ |
| LoRa DIO2 | 34 | ❌ |
| LoRa DIO3 | 21 | ❌ |
| LoRa DIO4 | 10 | ❌ |
| LoRa DIO5 | 36 | ❌ |
| LoRa CS | 7 | ❌ |
| BOOT Button | 0 | ❌ |
| Battery ADC | 1 | ❌ |
| Onboard LED | 37 | ❌ |
GPIO10 and GPIO21 can be freed by removing the two resistors connecting them to LoRa DIO3/DIO4.
SX1280 Pin Mapping
| Signal | GPIO | Available |
|---|---|---|
| QWIIC Uart1 TX | 43 | ✅ |
| QWIIC Uart1 RX | 44 | ✅ |
| I2C SDA | 18 | ❌ |
| I2C SCL | 17 | ❌ |
| SD CS | 13 | ❌ |
| SD MOSI | 11 | ❌ |
| SD MISO | 2 | ❌ |
| SD SCK | 14 | ❌ |
| LoRa SCK | 5 | ❌ |
| LoRa MISO | 3 | ❌ |
| LoRa MOSI | 6 | ❌ |
| LoRa RESET | 8 | ❌ |
| LoRa DIO1 | 9 | ❌ |
| LoRa BUSY | 36 | ❌ |
| LoRa CS | 7 | ❌ |
| BOOT Button | 0 | ❌ |
| Battery ADC | 1 | ❌ |
| Onboard LED | 37 | ❌ |
Contrast Comparison
Pinout Diagram
Dimensions
Schematic
Datasheet
Software Libraries
Dependent Libraries
FAQ
Q. How to choose the LoRa module version? A. SX1262/SX1276 are suitable for Sub-1 GHz bands (433/868/915 MHz) with longer range; SX1280 is suitable for the 2.4 GHz band with higher data rate.
Q. What changed from V1.2 to V1.3? A. V1.3 includes hardware optimizations and improved PCB layout over V1.2. The pin mapping remains the same.
Q. OLED screen not displaying? A. Check the I2C address configuration (SSD1306 default is 0x3C). Confirm SDA = GPIO18, SCL = GPIO17.
Q. SD card not recognized? A. Ensure the SD card is formatted as FAT32, check that it is properly inserted, and try a different card.
Q. Upload fails? A. Hold BOOT, press and release RST, then click Upload.
Changelog
| Version | Date | Notes |
|---|---|---|
| T3-S3 V1.2 | — | Initial release: ESP32-S3 with multi-band LoRa |
| T3-S3 V1.3 | — | Hardware optimization update |