![]() ![]() You can program Arduino UNO using ISCP or use the ISCP of Arduino UNO to program other Arduino Boards.ĭigital IO Pins 2 and 3 can be configured as External Interrupts Pins INT0 and INT1 respectively. The UART bootloader, which is preloaded in to the ATmega328P microcontroller, enables programming through serial interface. To reset the microcontroller, you can use the on-board RESET button.Īlthough you can program the Arduino UNO using the USB cable, there is a provision to program the MCU using the In-Circuit Serial Programming (ICSP) interface. Using the IOREF pin, you can set the reference voltage for Microcontroller operations. ![]() But using the AREF pin, you can manually set the upper limit of the ADC. The reference voltage for the internal ADC is by default set to 5V. Use this LED to perform Blinky operations. There is an on-board LED connected to digital IO pin 13. Digital IO Pins 10, 11 12 and 13 can be configured as SPI pins SS, MOSI, MISO and SCK respectively. The final communication interface is the SPI. They can be configured as SDA (A4) and SCL (A5) to support I2C or I 2C or Two Wire Interface (TWI) communication. These pins are connected to the serial pins of the on-board USB to Serial Converter IC.Īnalog Input Pins A4 and A5 have alternative functions. In fact, the Arduino boards (UNO or Nano or Mega) are programmed using the serial communication.ĭigital IO pins 0 and 1 are used as Serial RX and TX pins to receive and transmit serial data. Perhaps the most common communication interface in the Arduino universe is the Serial Communication. What Communication Interfaces are available on Arduino UNO?Īrduino UNO supports three different types of communication interfaces. You can use analogWrite() function for this. All the analog input pins provide a 10-bit resolution ADC feature, which can be read using analogRead() function.Īn important point about Analog Input pins is that they can be configured as Digital IO pins, if required.ĭigital IO pins 3, 5, 6, 9, 10 and 11 are capable of producing 8-bit PWM Signals. There are also 6 Analog Input Pins (A0 to A5). The value of the internal pull-up resistor will be in the range of 20KΩ to 50KΩ. An additional feature of the Digital IO pins is the availability of internal pull-up resistor (which is not connected by default). In that 14 pins (D0 to D13) are true digital IO pins, which can be configured as per you application using pinMode(), digitalWrite() and digitalRead() functions.Īll these Digital IO pins are capable of sourcing or sinking 20mA of current (maximum 40mA is allowed). Of the 32 pins available on the UNO board, 22 pins are associated with input and output. What are the Input and Output Pins of Arduino UNO?
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