![]() The ATmega168 has 1 KB of SRAM and 512 bytes of EEPROM (which can be read and written with the EEPROM library) the ATmega328 has 2 KB of SRAM and 1 KB of EEPROM. The ATmega168 has 16 KB of flash memory for storing code (of which 2 KB is used for the bootloader) the ATmega328has 32 KB, (also with 2 KB used for the bootloader). As a result, when running on external (non-USB) power, the 3.3V output (which is supplied by the FTDI chip) is not available and the RX and TX LEDs will flicker if digital pins 0 or 1 are high. The FTDI FT232RL chip on the Nano is only powered if the board is being powered over USB. The power source is automatically selected to the highest voltage source. 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). Specifications: Microcontrollerġ6 KB ( ATmega168) or 32 KB ( ATmega328) of which 2 KB used by bootloaderĥ12 bytes ( ATmega168) or 1 KB ( ATmega328) Note: since the free version of Eagle does not handle more than 2 layers, and this version of the Nano is 4 layers, it is published here unrouted, so users can open and use it in the free version of Eagle. Schematic and DesignĪrduino Nano 3.0 ( ATmega328): schematic, Eagle files.Īrduino Nano 2.3 ( ATmega168): manual (pdf), Eagle files. It lacks only a DC power jack, and works with a Mini-B USB cable instead of a standard one. It has more or less the same functionality of the Arduino Duemilanove, but in a different package. The ATmega168 or 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.The Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano 3.x) or ATmega168 (Arduino Nano 2.x). Select "Nano w/ ATmega328" from the Tools > Board menu (according to the microcontroller on your board). The Arduino Nano can be programmed with the Arduino software ( download). ![]() Typically used to add a reset button to shields which block the one on the board. Reset. Bring this line LOW to reset the microcontroller.AREF. Reference voltage for the analog inputs. ![]() There are a couple of other pins on the board: Analog pins 6 and 7 cannot be used as digital pins. 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. The Nano has 8 analog inputs, each of which provide 10 bits of resolution (i.e. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off.
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