Features:
- digital input / output ( I / O) terminals 0 ~ 13.
- analog input / output a( I / O) terminals 0 ~ 5.
- Support ISP download function.
- Input voltage: connected to the computer USB without external power supply, external power supply 7V ~ 12V DC voltage input.
- Output voltage: 5V DC voltage output and 3.3V DC voltage output.
- Using Atmega328 microprocessor controller