Key Features Native USB Support: Can act as CDC serial or mouse/keyboard HID device STEMMA QT Connector: JST SH 4-pin connector for solderless I2C connections and daisy-chaining RGB NeoPixel LED: Built-in addressable RGB LED for visual feedback 4x 8-bit ADC Inputs: Analog inputs on A0, A1, A2, and A3 pins 3x PWM Outputs: Pulse-width modulation outputs 4x Capacitive Touch: On A0-A3 pins - no external components required Hardware UART & SPI: Full hardware support for serial communication 3.3V Regulator: 600mA peak output Reset & Bootloader Buttons: Reset switch and bootloader button for easy programming Castellated Pads: Can be soldered flat to a PCB Technical Specifications Microcontroller: WCH CH552 (enhanced E8051 core) Architecture: 8-bit 8051 (MCS51 instruction set compatible) Clock Speed: 16 MHz (internal oscillator) Program Memory: 16 KB Flash RAM: 256-byte internal RAM + 1 KB xRAM (DMA-capable) Logic Voltage: .3V GPIO Pins: 10 Analog Inputs: 4 x 8-bit ADC (A0, A1, A2, A3) PWM Channels: 3 (A2/MOSI, SDA, RX, TX) Capacitive Touch: 4 channels (A0, A1, A2, A3) Serial Interfaces: UART, I2C (bit-banged), SPI USB: Full-speed USB device controller USB Connector: USB Type-C Regulator Output: 3.3V / 600mA peak Color: Black Material: PCB Package Contents: 1* Development Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.