Arduino Nano Specifications/Functions

In this article, we will explain in detail the specifications and functions of Arduino Nano.

The Arduino Nano is an even smaller Arduino board compared to the Arduino Micoro. It can be used by inserting it directly into the breadboard.

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Arduino Nano Specifications

Tech SpecsArduino Nano
Board Size43.2×17.8mm
Microcontroller/
Clock Speed
ATmega328P/
16MHz
SRAM
(Main Memory)
2kB
Flash Memory32kB
EEPROM1kB
Operating Voltage+5V
Input Voltage
(recommended)
+7~+12V
Output Voltage+5V, +3.3V
Digital I/O Pins20
PWM Digital I/O Pins6
Analog Input Pins8
Analog Output Pins
(DAC)
Rated Current per Pin40mA/Pin
Program Writing PinsMini USB Type-B
ICSP
InterfaceUART
I2C
SPI

For the specifications of Arduino boards other than Arduino Nano, see the following article.

Arduino Nano Fuctions

Arduino Nano Appearance

Pin Header Placement/LED Placement

Arduino Nano Pin Header LED Placement

↑Click to enlarge.

①Microcontroller(Microcomputer)

The Arduino Nano Microcontroller(Microcomputer) uses “ATmega328P” from Microchip Technology(USA).

A microcontroller(microcomputer) is a very important component in controlling electronic devices that correspond to the human “brain”.

In addition, various memories such as SRAM, Flash memory, and EEPROM are also built into the microcontroller.

②USB Port

You can communicate between Arduino Nano and PC by connecting it to the USB port of Arduino Nano and PC with a USB cable.

You can write a program(sketch) created on your PC to Arduino Nano, and control Arduino Nano from your PC by serial communication.

It also has the role of powering the Arduino Nano via USB, as it doesn’t have a power jack like the Arduino Uno.

However, please note that the USB port is “Mini USB Type-B”, which is becoming less popular.

③Reset Button

You can restart the Arduino Nano by pressing the reset button. Use this when you want to restart the program from the beginning or when the Arduino Nano behaves strangely.

④I/O Port・Power

Digital I/O・PWM

Digital I/O・PWMExplanation
D0-D19Digital input/output(0-19)
HIGH(+5V)/LOW(0V)
PWM0 to +5V analog output
Analog output by switching between 0V and +5V at high speed

PWM and serial communication are shared with digital I/O. You can specify which one to use in the program.

Analog Input

Analog InputExplanation
A0-A7Analog input(0-7)
10-bit A/D converter(1step change every 4.8mV)

Communication

CommunicationExplanation
UART
(Serial communication)
TXSerial data transmission
RXSerial data reception
I2CSCLSerial clock
SDASerial data transmission/reception
SPISSSelect device to control
SCKSerial clock
MOSIMaster ⇒ Slave data transfer
MISOSlave ⇒ Master data transfer

Power

PowerExplanation
VinThe voltage of “②USB Port” is output,
Power can be supplied from “Vin” without using the USB Port.
GNDGround/Reference point
+5V+5V voltage output
+3.3V+3.3V voltage output

Other

OtherExplanation
GNDGround/Reference point
AREFAnalog input reference voltage (0 to +5V input),
Not normally used
RESETReset
(Same function as “③Reset Button”)

⑤LED

LEDExplanation
ONLights up when the Arduino Nano is powered
TXBlinks when sending via serial communication
RXBlinks when receiving via serial communication
LConnect to digital I/O No.13

Arduino Nano has 4 LEDs(chip parts). The “L” of LED is connected to the 13th digital I/O, and can be lighted up by setting the 13th pin to HIGH (5V) in the program.

⑥ICSP(For ATmega328P)

By connecting an ICSP-compatible writer(program writing device), you can write programs(sketches) directly to the “ATmega328P”, which is an Arduino Nano microcontroller(microcomputer).

However, since you can usually write programs(sketches) via the USB port, I think that it is rarely used for writing purposes.

In addition, it can also be used as an SPI terminal.

How to get technical data for Arduino Nano

Various technical materials of Arduino Nano can be obtained from the official Arduino website.

Arduino Nano Technical Data
  • EAGLE FILES
  • SCHEMATICS: PDF Format
2
Arduino Nano DOCUMENTATION

Click “DOCUMENTATION”.

3
Arduino Nano EAGLE FILES SCHEMATICS Download

Click each icon to download the “EAGLE FILES” and “SCHEMATICS”.

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