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 rich enough in such a tiny Dev. Board as well. On the other hand, this little board has good performance in processing but needs less power. 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 -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 -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 downloading interface: USB Type-C interface : 1 user LED, 1 power LED, two for serial port downloading Reset button: two reset button short connect to reset Power Pads: For the battery power supply Software compatibility: Compatible with for IDE Projection cover for protecting the circuit Colour:white+black Material:PCB Size:20x17.5x3.5mm Package Contents: 1 x Seeeduino SAMD21G18 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.