Arduino functions You can learn basic hardware,knowledge of electronic circuit,connection driver,interrupt operation. You can learn knowledge of basic programming:connect voice sensor,infrared transmitter,camera,mechanical equipment...... Arduino have wide application such as toy car controller,chess robot,automatic watering can,light lamp,LED billboard...... Specifications Size :53.4mm * 75mm Master chip :ATMEGA328 Microcontrollers USBLine Power Supply:5v External power supply:7-12v, Suggested 9v Digital inputs/Output pin14(Where6A support PWM) Analog input pins6Range Built-in flash :32 KB SRAM:2k EEPROM: 1K Clock Frequency:16MHOuter port :DC input,USB B square opening Features 1 Change Pin : AREF pin plus next two I2C pins (SDA and SCL, just Analog 4 and copy 5 , not additional I2C interface ) , in addition, in the next RESET also added two pins , one is IOREF , allowing expansion board to adapt the onboard voltage , this pin expansion board just told what is currently onboard voltage ( such as UNO is 5V, can be seen as copy power pins , does not provide power to pull level on ) , and the other is the future stand placeholder pins. 2 more stable RESET circuit . RESET key position has changed, has been moved near the USB interface board corner , more convenient press. 3. ATmega16U2 instead 8U2, this does not mean there are 16K flash of R3 make your code run faster , this update is the USB interface chip services , in theory, it allows UNO can simulate USB HID, such as MIDI / Joystick / Keyboard.
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