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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