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You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin. The input voltage to the Arduino board when it's using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). Support I 2C (TWI) communication using the Wire library (documentation on the Wiring website). Analog inputs 6 and 7 (present on the Mini and BT) cannot be used as digital pins. Most of the analog inputs can also be used as digital pins: analog input 0 as digital pin 14 through analog input 5 as digital pin 19. In addition to the specific functions listed below, the analog input pins support 10-bit analog-to-digital conversion (ADC) using the analogRead() function. When the pin is HIGH value, the LED is on, when the pin is LOW, it's off. On the Diecimila and LilyPad, there is a built-in LED connected to digital pin 13. These pins support SPI communication, which, although provided by the underlying hardware, is not currently included in the Arduino language.
Arduino uno pinout code Bluetooth#
(Arduino BT-only) Connected to the reset line of the bluetooth module. On boards with an ATmega8, PWM output is available only on pins 9, 10, and 11. Provide 8-bit PWM output with the analogWrite() function. See the attachInterrupt() function for details. These pins can be configured to trigger an interrupt on a low value, a rising or falling edge, or a change in value.
Arduino uno pinout code serial#
On the Arduino Mini and LilyPad Arduino, they are intended for use with an external TTL serial module (e.g. On the Arduino BT, they are connected to the corresponding pins of the WT11 Bluetooth module. On the Arduino Diecimila, these pins are connected to the corresponding pins of the FTDI USB-to-TTL Serial chip. Used to receive (RX) and transmit (TX) TTL serial data. Each pin has an internal pull-up resistor which can be turned on and off using digitalWrite() (w/ a value of HIGH or LOW, respectively) when the pin is configured as an input. In addition to the specific functions listed below, the digital pins on an Arduino board can be used for general purpose input and output via the pinMode(), digitalRead(), and digitalWrite() commands.