Power
Vin, 3.3V, 5V, GND
Vin: Input voltage to Arduino when using an external power source (6-12V).
5V: Regulated power supply used to power microcontroller and other components on the board.
3.3V: 3.3V supply generated by on-board voltage regulator. Maximum current draw is 50mA.
GND: Ground pins.
Reset
Reset
Resets the microcontroller.
Analog Pins
A0 – A7
Used to measure analog voltage in the range of 0-5V
Input/Output Pins
Digital Pins D0 - D13
Can be used as input or output pins. 0V (low) and 5V (high)
Serial
Rx, Tx
Used to receive and transmit TTL serial data.
External Interrupts
2, 3
To trigger an interrupt.
PWM
3, 5, 6, 9, 11
Provides 8-bit PWM output.
SPI
10 (SS), 11 (MOSI), 12 (MISO) and 13 (SCK)
Used for SPI communication.
Inbuilt LED
13
To turn on the inbuilt LED.
IIC
A4 (SDA), A5 (SCA)
Used for TWI communication.
AREF
AREF
To provide a reference voltage for input voltage.
Arduino Nano Technical Specifications
Microcontroller
ATmega328P – 8-bit AVR family microcontroller
Operating Voltage
5V
Recommended Input Voltage for Vin pin
7-12V
Analog Input Pins
6 (A0 – A5)
Digital I/O Pins
14 (Out of which 6 provide PWM output)
DC Current on I/O Pins
40 mA
DC Current on 3.3V Pin
50 mA
Flash Memory
32 KB (2 KB is used for Bootloader)
SRAM
2 KB
EEPROM
1 KB
Frequency (Clock Speed)
16 MHz
Communication
IIC, SPI, US