Download the full pinout diagram as PDF here. The power source is automatically selected to the highest voltage source. 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 kOhms.
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Download the full pinout diagram as PDF here. The power source is automatically selected to the highest voltage source.
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 kOhms.
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 Provide 8-bit PWM output with the analogWrite function. These pins support SPI communication, which, although provided by the underlying hardware, is not currently included in the Arduino language.
LED: There is a built-in LED connected to digital pin The Nano has 8 analog inputs, each of which provide 10 bits of resolution i. 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. There are a couple of other pins on the board: AREF.
Reference voltage for the analog inputs. Used with analogReference. Bring this line LOW to reset the microcontroller. Typically used to add a reset button to shields which block the one on the board. Communication The Arduino Nano has a number of facilities for communicating with a computer, another Arduino, or other microcontrollers. The Arduino software includes a serial monitor which allows simple textual data to be sent to and from the Arduino board.
The Arduino software includes a Wire library to simplify use of the I2C bus. Programming The Arduino Nano can be programmed with the Arduino software download.
The ATmega 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.
It communicates using the original STK protocol. Automatic Software Reset Rather then 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. When this line is asserted taken low , the reset line drops long enough to reset the chip.
The Arduino software uses this capability to allow you to upload code by simply pressing the upload button in the Arduino environment. 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.
This setup has other implications. For the following half-second or so, the bootloader is running on the Nano. While it is programmed to ignore malformed data i. If a sketch running on the board receives one-time configuration or other data when it first starts, make sure that the software with which it communicates waits a second after opening the connection and before sending this data. Related Products.
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