Used to receive (RX) and transmit (TX) TTL serial data.
In addition, some pins have specialized functions: 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. 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.Įach of the 14 digital pins on the Nano can be used as an input or output, using pinMode(), digitalWrite(), and digitalRead() functions. The ATmega168 has 16 KB of flash memory for storing code (of which 2 KB is used for the bootloader) the ATmega328 has 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). Microcontroller Atmel ATmega168 or ATmega328ĭigital I/O Pins: 14 (of which 6 provide PWM output)įlash Memory: 16 KB (ATmega168) or 32 KB (ATmega328) of which 2 KB used by bootloader 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.
#EAGLE ARDUINO NANO SCHEMATIC MANUAL#
The Nano was designed and is being produced by Gravitech.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 Arduino Nano is a small, complete, and breadboard-friendly board based on the ATmega328 (Arduino Nano 3.0) or ATmega168 (Arduino Nano 2.x).
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