Lilygo T-Watch K210: A cheap base for a smartwatch with a display, camera and Wi-Fi
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The Lilygo TTGo T-Watch K210 is, in a sense, a starting point for a smartwatch project. The ESP32-based device boasts plenty of hardware, with Lilygo having included a 1.54-inch touchscreen display, 16 MB of QSPI flash storage and a camera among other components. However, please keep in mind that the K210 does not include a battery, which is a factor that we would need overcoming if you want to use the device without it being connected to the mains. The K210 weighs around 60 g and is 46.43 mm thick, for reference.
Lilygo has based the K210 on an ESP32-PICO-D4 chip, which the company has complemented with 4 MB of RAM. The device also supports up to 802.11 b/g/n Wi-Fi at a maximum transfer speed of 150 Mbps and Bluetooth 4.2. Hence, the K210 should be programable without needing to be connected to your computer via a USB cable.
An AI co-processor joins the ESP32 chip. Lilygo has opted for a Kendryte K210 RISC-V processor, which includes two cores. The 64-bit co-processor also has an FPU and 8 MB of SRAM. Additional sensors and actuators can be connected to the T-Watch K210 too. The device runs on FreeRTOS and is available to order from AliExpress or Amazon. The full list of hardware that Lilygo has included in the T-Watch K210 is as follows:
|Lilygo TTGo T-Watch K210|
|Wireless SIP||ESP32-PICO-D4ESP32 Wi-Fi & Bluetooth WiSoC4 MB flash|
|AI Processor||Kendryte K210 RISC-V (Dualcore)64-bit with FPU8 MB SRAM|
|Display||1.54-inch capacitive LCD 8080 (touchscreen)|
|Camera||2 MP OV2640 sensor (adjustable lens)|
|Audio||MAX98357 audio codecCVSD & SBC audio encodingbuilt-in microphone|
|Connectivity||Wi-Fi 4 (802.11b/g/n) - 2.4 GHzBluetooth 4.2 BR/EDR/BLE|
|Storage||16 MB QSPI flashMicroSD card reader|
|Debugging||USB Type-C port via CP2104|
|Expansion||UART, SPI, I2C, PWM, I2S, I2C grove connectorI/O Voltage - 3.3 V/1.8 V|
|Sensors||MPU6050 six-axis sensor with built-in step counting algorithm, activity recognition/trackingPIR AS312 motion sensor|
|Misc||Power and boot buttonsRTC26 MHz crystal|
|Power Supply||5 V DC/1 A DC inputAXP202 PMICOperating voltage – 2.7 V-3.6 VPower Consumption – 70 mA to 170 mA at 3.3 V|
|Dimensions & weight||42.72 x 19.87 x 46.43 mm60 g|
|Temperature range||40 °C ~ + 125 °C|