# LILYGO T-TWR Rev2.1

> LILYGO T-TWR Rev2.1 is an ESP32-S3 based programmable walkie-talkie board featuring the SA868 UHF/VHF radio module, GPS, OLED display, and battery support for amateur radio applications.

## Quick Facts

- **Brand:** LILYGO
- **Board Type:** dev-board
- **Price:** ~$48.99
- **Product Readiness:** developer
- **CPU:** ESP32-S3-WROOM-1-N16R8
- **CPU Architecture:** Xtensa LX7 dual-core
- **PSRAM:** 8MB
- **Flash:** 16MB
- **USB:** USB-C
- **Power:** 5V + Li-Ion 18650
- **Operating Voltage:** 3.3V
- **Battery:** 18650/21700 (user-supplied)
- **SD Card:** microSD
- **Display:** 1.3" OLED 128x64

## Connectivity

- **Wifi:** 802.11 b/g/n
- **Bluetooth:** BLE 5.0

## Open Source

- **Firmware:** Yes
- **Schematics:** No
- **PCB Layout:** No

## Compatible Firmware

softrf, openrtx, esp32aprs

## Use Cases

- amateur-radio
- aprs-tracking
- walkie-talkie
- gps-tracking
- lora-mesh-networking

## Components

- **ESP32-S3-WROOM-1-N16R8** (mcu): ESP32-S3 dual-core LX7 module with 16MB flash, 8MB PSRAM, Wi-Fi and Bluetooth 5 LE — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.espressif.com%2Fsites%2Fdefault%2Ffiles%2Fdocumentation%2Fesp32-s3_datasheet_en.pdf&ref=openhardware.directory&product=lilygo-t-twr-rev2-1&source=md-export)
- **SA868** (vhf-uhf-radio): SA868 UHF/VHF radio module available in 400-480 MHz (UHF) or 134-174 MHz (VHF) variants for amateur radio and walkie-talkie applications — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.nicerf.com%2Fdatasheet%2FSA868.pdf&ref=openhardware.directory&product=lilygo-t-twr-rev2-1&source=md-export)
- **L76K** (gps): Quectel L76K GNSS module supporting GPS, BDS, and GLONASS with built-in LNA, SAW filter, AGNSS, and 1PPS output — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.quectel.com%2Fproduct%2Fgnss-l76k&ref=openhardware.directory&product=lilygo-t-twr-rev2-1&source=md-export)
- **SH1106** (display-driver): 1.3 inch OLED display driver with 128x64 resolution connected via I2C (SDA: IO08, SCL: IO09) — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.displayfuture.com%2FDisplay%2Fdatasheet%2Fcontroller%2FSH1106.pdf&ref=openhardware.directory&product=lilygo-t-twr-rev2-1&source=md-export)
- **AXP2102** (pmu): AXP2102 PMU for battery charging and power distribution across the board — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.x-powers.com%2Fen.php%2FInfo%2Fproduct_detail%2Farticle_id%2F95&ref=openhardware.directory&product=lilygo-t-twr-rev2-1&source=md-export)

## Protocols

- **I2C**
- **SPI**
- **UART**
- **GPIO**

## Description

## Overview

The LILYGO T-TWR Rev2.1 is revision 2.1 of the T-TWR programmable walkie-talkie platform. It uses the ESP32-S3-WROOM-1-N16R8 module (16MB flash, 8MB PSRAM) paired with the SA868 UHF/VHF transceiver module available in 400–480 MHz or 134–174 MHz variants. A Quectel L76K GNSS module provides GPS, BDS, GLONASS positioning. The 1.3" SH1106 OLED display with 128×64 resolution is included for status display. Power is provided via USB, 21700, or 18650 battery. Onboard features include a PMU AXP2102, TF card slot, WS2812 RGB LED, and 4 buttons. Compatible with SoftRF Ham Edition, OpenRTX, ESP32APRS, and ArcticTracker firmware. Note: OpenRTX currently only supports version 2.0, not 2.1.

## Where to Buy

- [LILYGO Official](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-twr-rev2-1&ref=openhardware.directory&product=lilygo-t-twr-rev2-1&source=md-export) — $48.99

## Resources

- [product](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-twr-rev2-1&ref=openhardware.directory&product=lilygo-t-twr-rev2-1&source=md-export)
- [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FT-TWR&ref=openhardware.directory&product=lilygo-t-twr-rev2-1&source=md-export)

## Tags

`esp32-s3`, `sa868`, `walkie-talkie`, `uhf`, `vhf`, `aprs`, `amateur-radio`, `gps`, `meshtastic`

## Images

![LILYGO T-TWR Rev2.1](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-twr-rev2-1/b999e1e63464.jpg)
![LILYGO T-TWR Rev2.1](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-twr-rev2-1/ff996e58d478.jpg)
![LILYGO T-TWR Rev2.1](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-twr-rev2-1/007fc7720016.jpg)
![LILYGO T-TWR Rev2.1](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-twr-rev2-1/ef722acf0b20.jpg)
![LILYGO T-TWR Rev2.1](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-twr-rev2-1/fc89730cd15d.jpg)
![LILYGO T-TWR Rev2.1](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-twr-rev2-1/aa15f39401df.png)

> **Battery Powered:** 18650/21700 Li-ion

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