5 x Arduino Nano V3 Atmega328 are based on the 32kB Atmega328P-AU with 16MHz and mini USB port. It is compatible to Arduino Nano V3. We decided to use the CH340G USB chip to avoid known issues with drivers for FTDI or Prolific chips. The Nano V3 features a more powerful voltage regulation and a lower minimum operating voltage than the Italian original.
5 x Arduino Nano V3 Atmega328 (compatible) come with the following advanced functions:
– Arduino Nano V3 compatible control computer – Atmega328P-AU with 16MHz – up to 8 analog inputs – up to 20 digital I/O – 6.2 to 15V DC operating voltage – 1A max. load current on 5V output – 3.3V output for auxiliary equipment like sensors – Arduino boot loader installed – I/O and ICSP headers are included – WCH CH340G USB-TTL bridge – mini USB-B port – driver download for Windows 32/64 bit >>HERE<< – driver download for Mac OS X 10.9+ >>HERE<<
The Arduino Nano V3 Atmega328 can be powered via the Mini-B USB connection, 6-15V 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 CH340G 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.
The ATmega328 provide UART TTL (5V) serial communication, which is available on digital pins 0 (RX) and 1 (TX). Arduino included a serial monitor in the software IDE 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 USB-TTL chip and USB connection to the computer. 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.