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 an for microcontroller embedded with the SAMD21 chip.The interfaces of Seeeduino is enough in such a tiny Dev. Board as well. On the other hand, this little board has good performance in processing but needs less . As a matter of fact, it is designed in a tiny size and can be used for wearable devices and small projects.Application: Wearable devices, Rapid prototyping (directly attached to the expanded PCB as a minimal system), Perfect for all the projects need mini for , DIY keyboard, USB development (USB to multi-channel TTL/USB host mode, etc.), A scenario where you need to read multiple mock values The DAC output.Powerful CPU: ARM Cortex-M0+ 32bit 48MHz microcontroller(SAMD21G18) with 256KB Flash,32KB SRAMFlexible compatibility: Compatible with for IDEEasy project operation: Breadboard-friendlySmall 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 48MHzStorage: 256KB Flash,32KB SRAMI/O PINs: 14 GPIO PINs,11 analog PINs, 11 digital PINs, 1 DAC output PinInterface: 1 I2C interface,1 UART interface, 1 SPI interface supply and downloading interface: USB Type-C interfaceLEDs: 1 user LED, 1 LED, two LEDs for serial port downloadingReset button: two reset button short connect to reset Pads: For the battery supplySoftware compatibility: Compatible with for IDEProjection cover for protecting the circuitColour: blackMaterial: plasticSize: 20x17.5x3.5 mmPackage Contents:1 * For SAMD21G18 Microcontroller Development Board 2 * 7pins header4 * PastersOnly 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.