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Arduino Nano board guide

by devguy71

In this article we look at the Arduino Nano, another classic board

This is a much smaller board coming in at 18 x 45 mm versus 68.6 x 53.4 mm so is useful for projects that require a smaller footprint than the Uno

There are a wide range of libraries for sensors and modules available, if you want to use these they can save a great amount of development time. Of course you don’t have to use them.

As well as that there is a huge range of tutorials, code examples and help online – generally all of the examples for the Arduino Uno should work with this board as well.

You get an extra 2 analog pins which may be useful

Existing Arduino Uno shields will not work, I have seen adaptor boards that you can fit a nano in but it doesn’t appear they would allow Uno shields to work but there may be an option out there – cannot rule it out but that would be an extra cost.

Features

The ATmega328 has 32 KB, (also with 2 KB used for the bootloader. The ATmega328 has 2 KB of SRAM and 1 KB of EEPROM.

Microcontroller ATmega328
Architecture AVR
Operating Voltage 5 V
Flash Memory 32 KB of which 2 KB used by bootloader
SRAM 2 KB
Clock Speed 16 MHz
Analog I/O Pins 8
EEPROM 1 KB
DC Current per I/O Pins 40 mA (I/O Pins)
Input Voltage 7-12 V
Digital I/O Pins 22
PWM Output 6
Power Consumption 19 mA

Pins

Each of the 14 digital pins on the Arduino Nano can be used as an input or output. They are all 5 volt tolerant.  A maximum of 40mA is the value that must not be exceeded to avoid damaging the microcontroller.

The Arduino Uno has 6 analog inputs, each of which provide 10 bits of resolution. By default they measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin.

Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data.

External Interrupts: 2 and 3. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value.

PWM: 3, 5, 6, 9, 10, and 11. Provide 8-bit PWM output.

SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK). These pins support SPI communication using the SPI library.

LED: 13. There is a built-in LED driven by digital pin 13. When the pin is HIGH value, the LED is on, when the pin is LOW, it’s off.

The Nano has 8 analog inputs, each of which provide 10 bits of resolution. By default they measure from ground to 5 volts, though is it possible to change the upper end of their range using the analogReference() function. Analog pins 6 and 7 cannot be used as digital pins.

TWI/I2C: A4 or SDA pin and A5 or SCL pin.

AREF. Reference voltage for the analog inputs.

Reset. Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board.

Here is a pinout of the board

Arduino nano pinout

Arduino nano pinout

Installation

The board works out the box with the desktop IDE and the online IDE.

Many examples online

Cost

The price varies wildly on these boards – these are all clone options and all affiliate links.

Some of these are packs of 3

Site Link Price
Amazon.com Nano V3.0, Nano Board ATmega328P 5V 16M Micro-Controller Board Compatible with Arduino IDE (Nano x 3 with USB Cable) $15.99
Aliexpress 1PCS arduino Nano $0.62
Amazon.co.uk ELEGOO Nano Board 340/ATmega Nano328P compatible with offical Nano (pack of 3) £10

 

Summary

A small form factor Arduino board with an extra 2 analog pins, again a low cost board with many resources available.

 

 

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