Seeeduino for microcontroller-SAMD21 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 Dev. Board as . On the other hand, this little board has good performance in processing needs less power. As a matter of fact, it is designed in a size and can be used for wearable devices and small projects.Application: Wearable devices, Rapid prototyping (directly attached to the expanded PCB as a system), Perfect for all the projects need mini for , DIY keyboard, USB development (USB to multi-channel TTL/USB mode, etc.), A scenario where you need to read multiple mock values The DAC output. CPU: ARM -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 -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 interfacePower supply and downloading interface: USB Type-C interfaceLEDs: 1 LED, 1 power LED, two LEDs for serial port downloadingReset button: two reset button short connect to resetPower Pads: For the battery power supplySoftware compatibility: Compatible with for IDEProjection cover for protecting the circuitColour:white+blackMaterial:PCBSize:20x17.5x3.5mmPackage Contents:1 x Seeeduino SAMD21G18 Development BoardOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.