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The following table contains the datasheet of the Arduino Nano R3 microcontroller board:

BoardArduino NANO 3
ProcessorAVR 8-bit
Operating Voltage5V
Minimum Operating Voltage2.7V
Maximum Operating Voltage6V
Arduino IDE BoardArduino Nano

Power Supply via VIN,VCC7V...12V
Digital I/O Pins (with PWM)14 (6)
Analog Input Pins8
Resolution ADC10 bit (0...1023)
Analog Output Pins0
Max DC Current per I/O Pin40 mA
Max DC Current per 3V Pin50 mA

Flash Memory32 KB
EEPROM1024 bytes
Clock Speed16 MHz

Length x Width45mm x 18mm
Fits on standard breadboardyes

Touch sensorno
Ethernet MAC Interfaceno
Temperature Sensorno
Hall effect sensorno

Power jackno
USB connectionyes
Battery Connectionno

ProgrammableArduino IDE

5V Voltage RegulatorLM1117IMPX-5.0
Output Voltage5V
Maximum Input Voltage20V
Minimum Input Voltage7V
Maximum Output Current800mA
Maximum Voltage Dropout1.2V @ 800mA
Typical Quiescent Current5mA

3.3V Voltage RegulatorFT232R USB UART
Output Voltage3.3V
Maximum Input Voltage5.25V
Minimum Input Voltage4.35V
Maximum Output Current100mA
Typical Quiescent Current2.5mA

Power Consumption @ 9V
Reference Empty Script [mA]22.5
Reduce Clock Speed [mA]18.5
Low Power Mode [mA]4.83

Power Consumption @ 3.3V
Reduce Clock Speed [mA]3.41
Low Power Mode [mA]3.42

The Nano has one 3.3V and two 5V power pins of which one is the VIN pin. With the VIN pin you can supply the Arduino Nano with a voltage between 7V-12V to run the microcontroller on battery for example. All three power pins provide a maximum currency of 50 mA. You can close the circuit with two ground pins.

Power Suppply



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. 


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.


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