# LILYGO T-Watch Ultra > Premium ESP32-S3 smartwatch development platform with 2.06" AMOLED touchscreen, LoRa SX1262, GNSS, NFC, MAX98357A audio, DRV2605 haptic, AXP2101 PMIC, and 1100mAh battery. ## Quick Facts - **Brand:** LILYGO - **Board Type:** dev-board - **Price:** ~$78.32 - **Product Readiness:** developer - **CPU:** Xtensa LX7 dual-core @ 240MHz, FPU, AI instructions - **CPU Architecture:** Xtensa LX7 - **CPU Cores:** 2 - **RAM:** 512KB SRAM - **PSRAM:** 8MB - **Flash:** 16MB - **USB:** USB-C - **Power:** 5V + LiPo - **Operating Voltage:** 3.3V - **Dimensions:** 49×63.5×22mm - **Weight:** 250g - **Battery:** 1100mAh - **Charging Port:** USB-C - **Antenna:** U.FL/IPEX - **SD Card:** microSD - **Display:** 2.06" AMOLED 410×502 ## Connectivity - **Wifi:** 802.11 b/g/n - **Bluetooth:** BLE 5.0 - **Lora:** SX1262 868/915MHz ## Open Source - **Firmware:** Yes - **Schematics:** No - **PCB Layout:** No ## Certifications CE, FCC ## Compatible Firmware arduino, esp-idf, micropython ## Use Cases - smart-watch - asset-tracking - iot-gateway ## Components - **ESP32-S3** (mcu): Xtensa LX7 dual-core at 240MHz with 16MB flash, 8MB PSRAM, WiFi, and BLE 5.0. — [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-watch-ultra&source=md-export) - **CO5300** (display-driver): High-resolution AMOLED display driver supporting 410×502 pixels with 16.7M colors. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FT-Watch-Ultra&ref=openhardware.directory&product=lilygo-t-watch-ultra&source=md-export) - **CST9217** (touch-controller): Capacitive touch controller with I2C interface supporting up to 5 touch points. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FT-Watch-Ultra&ref=openhardware.directory&product=lilygo-t-watch-ultra&source=md-export) - **SX1262** (radio): Long-range LoRa transceiver covering 150–960 MHz with +22 dBm output power. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fsemtech.com%2Fuploads%2Fdocuments%2FDS_SX1261-2_V2.1.pdf&ref=openhardware.directory&product=lilygo-t-watch-ultra&source=md-export) - **MAX98357A** (audio-amplifier): Filterless 3.2W Class D amplifier with I2S interface for speaker audio output. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.analog.com%2Fmedia%2Fen%2Ftechnical-documentation%2Fdata-sheets%2FMAX98357A-MAX98357B.pdf&ref=openhardware.directory&product=lilygo-t-watch-ultra&source=md-export) - **DRV2605** (haptic): I2C haptic motor driver with 123 built-in waveforms for ERM and LRA actuators. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fwww.ti.com%2Flit%2Fds%2Fsymlink%2Fdrv2605.pdf&ref=openhardware.directory&product=lilygo-t-watch-ultra&source=md-export) - **AXP2101** (battery-charger): Advanced PMIC with multi-rail LDO outputs, LiPo charging, fuel gauge, and power-off control. — [Datasheet](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FT-Watch-Ultra&ref=openhardware.directory&product=lilygo-t-watch-ultra&source=md-export) ## Protocols - **SPI**: CLK: GPIO3, MOSI: GPIO1, MISO: GPIO4, CS: GPIO2 - **I2C**: SDA: GPIO10, SCL: GPIO11 - **I2S**: BCLK: GPIO44, WS: GPIO43, DOUT: GPIO45 ## GPIO Map | Pin | Name | Type | Functions | |-----|------|------|-----------| | GPIO10 | I2C SDA | I2C | digital-input, digital-output | | GPIO11 | I2C SCL | I2C | digital-input, digital-output | | GPIO44 | I2S BCLK | I2S | digital-output | | GPIO43 | I2S WS | I2S | digital-output | | GPIO45 | I2S DOUT | I2S | digital-output | ## Description ## Overview The LILYGO T-Watch Ultra is the most feature-rich smartwatch development platform from LILYGO, combining the ESP32-S3 with an impressive array of integrated peripherals into a complete wearable computing system. The centerpiece is a 2.06-inch AMOLED display (CO5300 driver, 410×502, 16.7M colors) with capacitive multi-touch (CST9217). Beyond standard smartwatch features, the Ultra integrates a SX1262 LoRa transceiver for long-range off-grid communication, GNSS for location tracking, NFC for contactless interactions, a MAX98357A Class-D amplifier for audio output, a DRV2605 haptic driver for tactile feedback, and a microphone for voice input. Power management is handled by the AXP2101 PMIC, which manages the 1100mAh LiPo battery with fuel gauging and multi-channel power rails. The built-in microSD card slot enables data logging and offline audio playback. This comprehensive feature set makes it ideal for search-and-rescue trackers, off-grid mesh network nodes, and custom smartwatch firmware development. ## Where to Buy - [LILYGO Official](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-watch-ultra&ref=openhardware.directory&product=lilygo-t-watch-ultra&source=md-export) — $78.32 - [OpenELab](https://openhardware.directory/r?to=https%3A%2F%2Fopenelab.io%2Fproducts%2Flilygo-t-watch-ultra-lora&ref=openhardware.directory&product=lilygo-t-watch-ultra&source=md-export) — €99.95 ## Resources - [product](https://openhardware.directory/r?to=https%3A%2F%2Flilygo.cc%2Fproducts%2Ft-watch-ultra&ref=openhardware.directory&product=lilygo-t-watch-ultra&source=md-export) - [github](https://openhardware.directory/r?to=https%3A%2F%2Fgithub.com%2FXinyuan-LilyGO%2FT-Watch-Ultra&ref=openhardware.directory&product=lilygo-t-watch-ultra&source=md-export) ## Tags `esp32-s3`, `smartwatch`, `lora`, `gnss`, `amoled`, `nfc`, `haptic`, `lilygo` ## Images ![LILYGO T-Watch Ultra](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-ultra/228ba2209a6e.jpg) ![LILYGO T-Watch Ultra](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-ultra/114409a3c57a.jpg) ![LILYGO T-Watch Ultra](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-ultra/3f5f67e4e5a9.jpg) ![LILYGO T-Watch Ultra](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-ultra/66280c62b860.jpg) ![LILYGO T-Watch Ultra](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-ultra/867bb9196276.jpg) ![LILYGO T-Watch Ultra](https://nbg1.your-objectstorage.com/openhardware-directory/entities/lilygo-t-watch-ultra/aa15f39401df.png) > **Battery Powered:** Li-Po --- [View full device page](https://openhardware.directory/devices/lilygo-t-watch-ultra)