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Specifications: - Microcontroller: Atmel ATmega328 - Architecture: AVR - Operating voltage: 5V - Input voltage: 7-12V - Flash memory: 32 KB of which 2 KB used by bootloader - SRAM: 2 KB - Clock frequency: 16 MHz - Analog I / O pins: 8 - EEPROM: 1 KB - DC current per I / O pins: 40 mA (I / O pins) - Digital I / O pins: 22 - PWM output: 6 - Power consumption: 19 mA - Dimensions: 0.70 "x 1.70'' 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. - 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 chip.