Arduino Nano

The Arduino Nano is an open-source breadboard-friendly microcontroller board based on the Microchip ATmega328P microcontroller (MCU) and developed by Arduino.cc and initially released in 2008. It offers the same connectivity and specs of the Arduino Uno board in a smaller form factor.[1]

Arduino Nano
Arduino Nano with ATmega328P MCU
Developerarduino.cc
ManufacturerMany
TypeSingle-board microcontroller
AvailabilityNano webpage
Operating systemNone
CPUMicrochip AVR (8-bit)
at 16 MHz
Memory2 KB SRAM
Storage32 KB Flash
1 KB EEPROM

The Arduino Nano is equipped with 30 male I/O headers, in a DIP-30-like configuration, which can be programmed using the Arduino Software integrated development environment (IDE), which is common to all Arduino boards and running both online and offline. The board can be powered through a type-B mini-USB cable or from a 9 V battery.[2]

History

In 2008, the Arduino Nano was released.

In 2019, Arduino released the Arduino Nano Every, a pin-equivalent evolution of the Nano. It features a ATmega4809 microcontroller (MCU) with three times the RAM.[3]

Technical specifications

Communication

The Arduino Nano has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The ATmega328 provides UART TTL serial (5V) communication, which is available on digital pins 0 (RX) and 1 (TX).

An FTDI FT232RL on the board channels this serial communication over USB and the FTDI drivers (included with the Arduino firmware) provide a virtual com port to software on the computer. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board. The RX and TX LEDs on the board flash when data is being transmitted via the FTDI chip and the USB connection to the computer (but not for serial communication on pins 0 and 1). A SoftwareSerial library allows for serial communication on any of the Nano's digital pins. The ATmega328 also supports I2C and SPI communication. The Arduino software includes the Wire library to simplify use of the I2C bus.[4]

Automatic (software) reset

Rather than requiring a physical press of the reset button before an upload, the Arduino Nano is designed in a way that allows it to be reset by software running on a connected computer. One of the hardware flow control lines (DTR) of the FT232RL is connected to the reset line of the ATmega328 via a 100 nanofarad capacitor. When this line is asserted (taken low), the reset line drops long enough to reset the chip.[4]

This setup has other implications. When the Nano is connected to a computer running Mac OS X or Linux, it resets each time a connection is made to it from software (via USB). For the following half-second or so, the bootloader is running on the Nano. While it is programmed to ignore malformed data (i.e. anything besides an upload of new code), it will intercept the first few bytes of data sent to the board after a connection is opened.[4]

Arduino board comparison

The following table compares official Arduino boards. It is split into two groups, boards based on 8-bit AVR microcontrollers and boards based on 32-bit ARM Cortex-M microcontrollers. This table has a similar layout as a table in the Arduino Uno article.

Board
Name
& Part#		 Board
Size
Group		 Board
Commun-
ication		 MCU
Part#
& Pins		 MCU
I/O
Voltage		 MCU
Core		 MCU
Clock		 MCU
Flash		 MCU
SRAM		 MCU
EEPROM		 MCU
USART
& UART		 MCU
SPI		 MCU
I²C		 MCU
Other Bus
Peripherals		 MCU Timers
32/24/16/8
/WD/RT/RC		 MCU
ADC
& DAC		 MCU
Engines
Nano,[6]
A000005[7]		 Nano USB-Mini-B ATmega328P,[8]
32 pin		 5V
(1.8-5.5V)		 8bit AVR 16 MHz* 32 KB 2 KB 1 KB 1, 0 1 1 None 0, 0, 1, 2,
WD		 10bit,
None		 None
Nano Every,[9]
ABX00028[10]		 Nano USB-Micro-B ATmega4809,[11]
48 pin		 5V
(1.8-5.5V)		 8bit AVR 20 MHz 48 KB 6 KB 0.25 KB 4, 0 1 1 None 0, 0, 5, 0,
WD, RT		 10bit,
None		 None
Nano 33 IoT,[12]
ABX00027[13]		 Nano USB-Micro-B,
WiFi,
Bluetooth		 ATSAMD21G18,[14]
48 pin		 3.3V
(1.62-3.63V)		 32bit ARM
Cortex-M0+		 48 MHz 256 KB 32 KB None 6, 0 None None USB-FS,
I²S		 0, 4, 5, 0,
WD, RC,
24bit SysTick		 12bit,
10bit		 DMA x12,
CRC32, Touch
Nano RP2040
Connect,[15]
ABX00052[16]		 Nano USB-Micro-B,
WiFi,
Bluetooth		 RP2040,[17]
56 pin		 3.3V
(1.62-3.63V)		 32bit ARM
Cortex-M0+
(dual core)		 133 MHz
both
cores		 None (int)
16 MB (ext)
+ bootrom		 264 KB None 0, 2 2 2 USB-FS,
8pin Prog I/O		 4, 0, 8, 0,
WD, RC,
24bit SysTick		 12bit,
None		 DMA x2
Arduino Nano Every board with ATmega4809 MCU
Arduino Nano 33 IoT board with ATSAMD21G18 MCU
Nano RP2040 Connect board with RP2040 MCU
Table notes
  • Board Size Group column - Simplified board dimension size grouping: Nano means similar size as Arduino Nano board. This table has a similar layout as a table in the Arduino Uno article.
  • MCU Part# / Pins column - MCU means microcontroller. All MCU information in this table was sourced from official datasheets in this column. The pin count is useful to determine the quantity of internal MCU features that are available.
  • MCU I/O Voltage column - Microcontrollers on official Arduino boards are powered at a fixed voltage of either 3.3 or 5 volts. The voltage rating of the microcontroller is stated inside parenthesis, though Arduino boards don't support this full range.
  • MCU Clock column - MHz means 106 Hertz. The ATmega328P MCU is rated for a maximum of 20 MHz, but the Nano board operates at 16 MHz.
  • MCU memory columns - KB means 1024 bytes, MB means 10242 bytes.
  • MCU SRAM column - SRAM size doesn't include caches or peripheral buffers.
  • MCU USART/UART column - USARTs are software configurable to be a: UART / SPI / other peripherals (varies across MCUs).
  • MCU Other Bus Peripherals column - For USB bus, "FS" means Full Speed (12Mbps max). The RP2040 (Nano RP2040 Connect board) has a programmable I/O controller that can emulate various buses. Some buses require additional external circuitry to operate.
  • MCU Timers column - The numbers in this column are the total number of each timer bit width, for example, the ATmega328P has one 16-bit timer and two 8-bit timers. "WD" means Watchdog timer, "RT" means Real Time Counter/Timer, "RC" means Real Time Clock (sec/min/hr). The 24-bit SysTick timer(s) inside the ARM cores aren't included in the 24-bit total in this column. PWM features are not documented in this table.

See also

References
  1. "Getting Started with the Arduino Nano". Arduino.
  2. "Arduino Nano". Arduino Official Store. Archived from the original on 2020-12-08. Retrieved 2020-11-25.
  3. "Deep dive with Dario: Get to know the Arduino Nano Every". Arduino Blog. 31 May 2019. Retrieved 2020-11-25.
  4. "Arduino Nano". arduino.cc. Archived from the original on 2020-11-30. Retrieved 2020-11-25.
  5. Aqeel, Adnan (2018-06-25). "Introduction to Arduino Nano". The Engineering Projects. Retrieved 2021-12-08.
  6. "Board; Nano; Docs". Arduino. Archived from the original on May 17, 2023.
  7. "Board; Nano; Store". Arduino.
  8. "MCU; ATmega328P; Docs". Microchip. Archived from the original on March 27, 2023.
  9. "Board; Nano Every; Docs". Arduino. Archived from the original on May 13, 2023.
  10. "Board; Nano Every; Store". Arduino.
  11. "MCU; ATmega4809; Docs". Microchip. Archived from the original on December 6, 2022.
  12. "Board; Nano 33 IoT; Docs". Arduino. Archived from the original on May 9, 2023.
  13. "Board; Nano 33 IoT; Store". Arduino.
  14. "MCU; ATSAMD21G18; Docs". Microchip. Archived from the original on February 1, 2023.
  15. "Board; Nano RP2040 Connect; Docs". Arduino. Archived from the original on May 13, 2023.
  16. "Board; Nano RP2040 Connect; Store". Arduino.
  17. "MCU; RP2040; Docs". Raspberry Pi. Archived from the original on May 13, 2023.

Further reading
Main article: List of books about Arduino
Wikimedia Commons has media related to Arduino Nano.
Programming Cheat Sheets
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