Introduction

Arduino Nano is a small complete chip board based on ATmega 328 (v3.0) or Atmega 168 (v2.0). Every Arduino has the same functionality and the same features except the number of pins and size. One of the major flaws of this board is that it doesn't have any power jack. So, you can't supply power from any external power source like a battery. Apart from this, more or less this board is quite similar to any Arduino board.
Figure 1 Arduino board
If you ask what the benefits of this board are then, I would say:
But, when we talk about the cons of this board then, I would say:
Specifications
  • Microcontroller: Atmel ATmega 168(v2) or ATmega328 (v3)
  • Operating Voltage: 5v
  • Input Voltage: 7-12v
  • Digital I/O Pins: 14
  • Analogue Input Pins: 8
  • Flash Memory: 16Kb or 32Kb (depends upon ATmega board)
  • SRAM: 1Kb or 2Kb (depends upon ATmega board)
  • EEROM: 512Bytes or 1Kb
  • Clock Speed: 16MHz
Simple Test
We will light a Red LED using a digital pin. So, you need a few pre-requisites for this demo.

  • A Red LED
  • Arduino Nano
  • 1kOhm Resistor
  • Two jumper wires
Connection Layout
Figure 2 Connection Layout
Sketch
  1. int LED = 5;
  3. void setup() {
  5. pinMode(LED, OUTPUT);
  6. digitalWrite(LED, HIGH);
  8. }
  10. void loop() {
  11. // nothing
  12. }
And, it will turn on the LED constantly.
Figure 3 LED Constantly

Conclusion

 It is one of the most compact and smallest Arduino board. So, you can use this tiny board in your prototype more often than Uno or mega. It is, however, better to avoid it if you have a bulk of code or more input/output operations.