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The Nano automatically senses and switches to the higher power supply, so there is no need for a power select jumper. The power source is automatically selected to the highest voltage source. As a result, when running on external non-USB power, the 3. 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. In addition, some pins have specialized functions:. 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. 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 DFRduino language.
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. Additionally, some pins have specialized functionality:. Bring this line LOW to reset the microcontroller.
Typically used to add a reset button to shields which block the one on the board. The DFRduino software includes a serial monitor which allows simple textual data to be sent to and from the DFRduino board. For details, see the reference and tutorials. DFR on the DFRduino 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 reference, C header files. You can also bypass the bootloader and program the microcontroller through the ICSP In-Circuit Serial Programming header; see these instructions for details.
Rather then requiring a physical press of the reset button before an upload, the DFRduino 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 DFRduino software uses this capability to allow you to upload code by simply pressing the upload button in the DFRduino 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. Discussion View source History. Arduino Nano SKU: Retrieved from " https: This page was last modified on 19 March , at