When the pin is set LOW or 0, the LED turns OFF. When this pin is set HIGH or 1, the LED turns ON. Pin 13 LED Indicator (Blue): In the board, there is a built-in LED connected to digital pin 13. It can also display the voltage of the battery onto the LCD connected to the Arduino board. Power Indicator: It indicates the status of the battery. Receiving Data Indicator LED (Red): When this LED lights up, the board is receiving data from the computer. Transmitting Data Indicator LED (White): When this LED ON, the Arduino Nano is transmitting data to the computer. LED Indicators on Arduino Nano:Īrduino Nano board consist of 4 LED indicators: Sending a signal to this pin does nothing. It provides the voltage reference at which the microcontroller is currently operating. REF: This pin is the input/output reference. If this pin is supplied with 5 V, the board will reset automatically GND (Ground pins): There is a total of 5 ground pins on the board. UART pins on board: D0(TX), D1(RX) Other pins: It also represents the successful flow of data from the computer to the board. The TXD is used for transmitting the data, and RXD is used for receiving the data during serial communication. UART Pins: TXD and RXD pins are used for serial communication. This allows us to have multiple SPI peripheral devices sharing the same MISO, MOSI, and CLK lines.Įxternal Interrupts (2 and 3)- These pins can be used to trigger an external interrupt in the following conditions: a low value, a rising or falling edge, or a change in value. When its value HIGH, it ignores the master. When a device’s Slave Select pin value is LOW, it can communicate with the master. A part marked TXC 8. Many of the official Arduino boards use a ceramic resonator, not a crystal. ![]() This line is used for sending data to the peripherals. The ceramic resonators are not nearly as good as a crystal - but they are good enough for serial and most other common tasks.
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