Arduino Nano is a function module which is very small but has a lot of advantages. The shape is very small so it is suitable to make a project that looks small. Arduino Nano is very special because of this support with breadboards. You can plug arduino and other electronic components in one breadborad. In the Arduino Nano 2.x version, still used avr ATmega168 microcontroller while the Arduino Nano 3.x version already used avr ATmega328 microcontroller.
Arduino Nano has features and functions similar to arduino Duemilanove. But Arduino Nano in different packaging. Arduino nano does not have a DC jack so that its power supplied through mini-B USB port or directly connect to the VCC pin and GND. Arduino Nano can be supplied with a voltage of 6-20V power source via USB mini-B port. Or you can provide a voltage of 5V on pin 30 (this voltage will not be adjusted by the regulator, so make sure you provide 5V voltage)
Arduino Nano Specifications:
|Microcontroller||Atmel ATmega168 or ATmega328|
|Operating Voltage (logic level)||5 V|
|Input Voltage (recommended)||7-12 V|
|Input Voltage (limits)||6-20 V|
|Digital I/O Pins||14 (of which 6 provide PWM output)|
|Analog Input Pins||8|
|DC Current per I/O Pin||40 mA|
|Flash Memory||16 KB (ATmega168) or 32 KB (ATmega328) of which 2 KB used by bootloader|
|SRAM||1 KB (ATmega168) or 2 KB (ATmega328)|
|EEPROM||512 bytes (ATmega168) or 1 KB (ATmega328)|
|Clock Speed||16 MHz|
|Dimensions||0.73″ x 1.70″|
In some cases, Arduino Nano has features that are more complete than arduino uno. Arduino Nano has 8 channel ADC (Analog to Digital Converter) while the Arduino Uno only has 6 channels. Through the RX and TX pins you can communicate serially with other devices. According datasheet ATmega328 AVR microcontroller, Arduino Nano has 2 pin interrupt, namely int0 and int1.
Overall, Arduino nano has 30 pins. The 8 pin of them (19-26 pin) are Analog pins (ADC). While the other 14 pins are Digital pins (Please see the picture above to see the position of digital and analog pins).
You have to write the source code for arduino nano on Arduino IDE sofftware. Then, you can download the program on an Arduino Nano using a USB-B cable.