Seeeduino for microcontroller-SAMD21 Cortex M0+ is the smallest member of the Seeeduino series. Seeeduino is the smallest for compatible board in the Seeeduino series. This is a for microcontroller embedded with the SAMD21 chip. The interfaces for Seeeduino are sufficient in such a small Dev. Board too. On the other hand, this small board has good performance in processing but needs less . In fact, it is designed in a small size and can be used for wearable devices and small projects. Usage: Wearable devices, Rapid prototyping (directly connected to the expanded PCB as a minimal system), Perfect for any project that needs mini for , DIY keyboards, USB development (USB to multi-channel TTL/USB host mode, etc.), A scenario where you need to read multiple bus values DAC output. Powerful CPU: ARM Cortex-M0+ 32bit 48MHz microcontroller (SAMD21G18) with 256KB Flash, 32KB SRAM Flexible Compatibility: Compatible with for IDE Easy Project Operation: Breadboard friendly Small Size: As small as a thumb (20x17.5mm) for wearable devices and small projects. Multiple Development Interfaces: 11 digital/analog pins, 10 PWM pins, 1 DAC output, 1 SWD Bonding pad interface, 1 I2C interface, 1 UART interface, 1 SPI interface. CPU: ARM Cortex-M0+ CPU (SAMD21G18) running at up to 48MHz Storage: 256KB Flash, 32KB SRAM I/O PINs: 14 GPIO PINs, 11 analog PINs, 11 digital PINs, 1 DAC output Pin Interface: 1 I2C interface, 1 UART interface, 1 SPI interface Power Supply and Download Interface: USB Type-C interface LEDs: 1 user LED, 1 LED, two LEDs for serial port download Reset Button: two reset buttons short connection to reset boards: For battery power Software Compatibility: Compatible with for IDE Projection protection to protect the circuit Color: black Material: plastic Size: 20x17.5x3.5mm Package Contents: 1 * For SAMD21G18 Microcontroller Development Board 2 * 7pins header 4 * Pasters Only the above package content, other products are not included. Note: Light 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.