Data Sheet
The Arduino Nano is open-source hardware! You can build your own board using the following files:
EAGLE FILES IN .ZIP SCHEMATICS IN .PDF
Power
The Arduino Nano can be powered via the Mini-B USB connection, 6-20V unregulated external power supply
(pin 30), or 5V regulated external power supply (pin 27). The power source is automatically selected to the
highest voltage source.
Memory
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.
Input and Output
Each of the 14 digital pins on the Nano can be used as an input or output, using pinMode(), digitalWrite(),
and digitalRead() functions. They operate at 5 volts. Each pin can provide or receive a maximum of 40 mA
and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms. In addition, some pins have
specialized functions:
Serial: 0 (RX) and 1 (TX). Used to receive (RX) and transmit (TX) TTL serial data. These pins are
connected to the corresponding pins of the FTDI USB-to-TTL Serial chip.
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. See the attachInterrupt() function for details.
PWM: 3, 5, 6, 9, 10, and 11. Provide 8-bit PWM output with the analogWrite() function.
SPI: 10 (SS), 11 (MOSI), 12 (MISO), 13 (SCK). These pins support SPI communication, which,
although provided by the underlying hardware, is not currently included in the Arduino language.
LED: 13. There is a built-in LED connected to 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 (i.e. 1024 different values). 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. Additionally, some
pins have specialized functionality:
I2C: A4 (SDA) and A5 (SCL). Support I2C (TWI) communication using the Wire library
(documentation on the Wiring website).
There are a couple of other pins on the board:
AREF. Reference voltage for the analog inputs. Used with analogReference().
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.
Communication
The Arduino Nano has a number of facilities for communicating with a computer, another Arduino, or other
microcontrollers. The ATmega328 provide UART TTL (5V) serial 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 software) 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 will flash when data is being transmitted via the FTDI chip
and 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 support I2C
(TWI) and SPI communication. The Arduino software includes a Wire library to simplify use of the I2C bus.
To use the SPI communication, please see ATmega328 datasheet.
Programming
The Arduino Nano can be programmed with the Arduino software (download). Select "Arduino Duemilanove
or Nano w/ ATmega328" from the Tools > Board menu (according to the microcontroller on your board). The
ATmega328 on the Arduino Nano comes preburned with a bootloader that allows you to upload new code to
it without the use of an external hardware programmer. It communicates using the original STK500
protocol. You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit
Serial Programming) header using Arduino ISP or similar.
https://store.arduino.cc/datasheet/index/index/url_key/arduino-nano/
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