LILYGO T-LoRa Dual

Overview

The LILYGO T-LoRa Dual is a compact LoRa development board centered on the Semtech LR1121 dual-band transceiver. The LR1121 is a versatile radio chip capable of operating in both sub-GHz frequencies (433, 868, and 915 MHz) and the 2.4 GHz band, allowing a single device to participate in multiple LoRa networks or switch between bands based on regional requirements.

Weighing only 45 grams, the T-LoRa Dual is designed for lightweight, low-power LoRa applications where multi-band capability is required. The GitHub repository (T-ELRS-LR1121) provides sample code and documentation for integrating the LR1121 into custom projects, including ExpressLRS (ELRS) radio control link implementations.

This board is ideal for developers building LoRa gateways, range-testing tools, or custom radio protocols that need dual-band flexibility. Its compact size makes it suitable for embedding in UAVs, remote sensors, and portable radio test equipment.

Firmware Compatibility

• Arduino — Use RadioLib (which has LR1121 support) with the board's pinout configuration from the GitHub repository.
• ExpressLRS (ELRS) — The T-ELRS-LR1121 repository provides ELRS-specific firmware for RC link applications.
• Custom LoRa protocols — The LR1121 supports LoRa, LoRa-E (frequency hopping), and FSK modulation.

Flashing Guide

1. Clone the LILYGO T-ELRS-LR1121 GitHub repository for board support files.
2. Install the RadioLib library in Arduino IDE for LR1121 control.
3. Connect via the appropriate USB connector.
4. Select the correct board target based on the onboard MCU.
5. Configure the LR1121 via SPI using RadioLib's Semtech LR1121 driver.
6. Refer to the GitHub repository for pinout diagrams and example sketches.