LILYGO T-TWR

Overview

The LILYGO T-TWR (Two-Way Radio) is a development board designed for building digital walkie-talkie and amateur radio applications. It combines the ESP32-S3 with a SA868 UHF/VHF FM radio module covering either the UHF (400–480 MHz) or VHF (134–174 MHz) band depending on the variant, with an SMA antenna connector for external antennas.

The board includes a 0.96-inch OLED display (SSD1306, 128×64) connected via I2C for channel and status display, a three-way encoder switch for frequency tuning and menu navigation, and a battery switch for clean power control with 18650 battery support. WiFi and BLE connectivity via the ESP32-S3 enables IP-to-RF bridging, remote configuration, and integration with APRS or other digital radio protocols.

This platform is popular with amateur radio enthusiasts, emergency communication builders, and developers working on mesh radio networks. The board has been superseded by the T-TWR Plus with additional features.