1. For R3 is a development board based on the Atmega328P microcontroller. 2. It has 14 digital input/output pins (6 of these pins can be used as PWM output pins), 6 analog input pins, 16MHz quartz crystal oscillator, USB interface, power interface, and supports online serial programming and reset button. 3. The only needs to connect the development board with the computer through the USB interface to use it. 4. It is applicable for 's software and hardware platforms based on development source code. It is easy to learn and has strong scalability. 5. The advantage of for is that it is simple and convenient to . If you are not familiar with the chip, you can write it for programming, of going through the SCM's data manual to configure registers. This is a great advantage. Moreover, the development board has a unified interface, and the has strong portability. It is in resources and easy to use. It is very suitable for beginners to learn. Product name: For R3 development board Microcontroller: Atmega328P Working voltage: 5V Input voltage (recommended value): 7-9V Digital I/O pin: 14 (6 of which PWM output) Analog input pin: 6 DC current of each I/O pin: 40mA DC current of 3.3V pin: 50mA Flash Memory:32 KB () SRAM: 2 KB EEPROM:1 KB Clock speed: 16MHz Length: 68.6mm Width: 53.4mm color:Green Material:PCB+Metal Package Contents: 1 x For R3 development board 1 x Data cable Only 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.