1、Open the circuit diagram of the original design, the development software interface is free to download, or you can modify it yourself according to your needs, the downloading program is simple and convenient 2、You can simply use sensors and various electronic components to connect (such as: LED lights, buzzers, buttons, photoresistors, etc.) to make a variety of interesting works 3、Using a high‑speed microprocessor controller, the development operation interface and environment are very simple and easy to understand, which is very suitable for beginners to learn 4、High quality PCB material can make sure the durability and stability of the product 5、Support for ISP download function, no external power supply is required when connected to the computer USB, external power supply is 5V~9V DC voltage input. Item Type: Development Board Module for R3 Material: PCB Performance Description: Digital I/O Digital input/output terminals are 0~13 in total. Analog I/O Analog input/output terminals are 0~5 in total. Support ISP download function Input Voltage: No external power supply is required when connected to the computer USB, external power supply is 5V~9V DC voltage input. Output Voltage: DC 5V DC voltage output and 3.3V DC voltage output. Using for Atmel microcontroller This version is optimized on the original version. It is mainly designed for foreign customers with high product quality and function requirements. It not only guarantees complete compatibility with the original version, but also makes it easy for everyone to use. Advantage: 1 Thoroughly solve the incompatibility and instability of traditional boards on for win7/win8 systems 2. The pin header is added, which is convenient for everyone to use jump wire 3. Replaced for 16u2, cut the cost in half, and consumers get the greatest benefit How to Use: 1. Download 2. Plug in the development board, the driver will be installed automatically 3. Select the board in die 4. Select the COM port, this can be queried in my computer, the port in the development board just now 5. It's best to choose first, and burn the built-in routine program into it 1 x Development Board Module 1 x Pin Header