Digital I/O Digital input/output terminal, a total of 0 ~ 13.
Analog I/O Analog input/output terminal, a total of 0 ~ 5.
Support the ISP download function.
The input voltage: when connected to the computer USB without external power supply, external power supply 5 v ~ 9 v dc voltage input.
Output voltage: 5 V dc voltage output and 3.3 V dc voltage output.
Using Atmel Atmega328 microprocessor controller
