This means that the bootloader can have a shorter timeout, as the lowering of DTR can be well-coordinated with the start of the upload. The Arduino software uses this capability to allow you to upload code by simply pressing the upload button in the Arduino environment. When this line is asserted (taken low), the reset line drops long enough to reset the chip. One of the hardware flow control lines (DTR) of the FT232RL is connected to the reset line of the ATmega168 or ATmega328 via a 100 nF capacitor. Rather than requiring a physical press of the reset button before an upload, the Arduino Nano is designed in a way that allows it to be reset by software running on a connected computer. You can also bypass the bootloader and program the microcontroller through the ICSP (In-Circuit Serial Programming) header using Arduino ISP or similar see these instructions for details. It communicates using the original STK500 protocol ( reference, C header files). The ATmega168 or ATmega328 on the Arduino Nano comes with a bootloader that allows you to upload new code to it without the use of an external hardware programmer. The Arduino Nano can be programmed with the Arduino software ( download). The RX and TX LEDs on the board will flash when data is being transmitted via the FTDI chip and USB connection to the computer (but not for serial communication on pins 0 and 1).Ī SoftwareSerial library allows for serial communication on any of the Nano's digital pins. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board. ![]() An FTDI FT232RL on the board channels this serial communication over USB and the FTDI drivers (included with the Arduino software) provide a virtual com port to software on the computer. The ATmega168 and ATmega328 provide UART TTL (5V) serial communication, which is available on digital pins 0 (RX) and 1 (TX). The Arduino Nano has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. They operate at 5 V.Įach pin can provide or receive a maximum of 40 mA and has an internal pull-up resistor (disconnected by default) of 20-50 kOhms.
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