1.The Digital I/O input/output terminals total 0^13.
2.Analog I/O inputs/outputs: 0~5.
3.Supports ISP download functionality.
4.Input voltage: No external power supply is required when connected to a computer via USB. External power supply requires a 5V * 9V DC voltage input.
5.Output voltage: 5V DC voltage output and 3.3V DC voltage output.
6.Employs Atme | Atmega328 microprocessor controller