Pin 2 is the cathode pin of the IR within the optocoupler. It will give the logical input signal to the internal IR. Out of these 32 pins, 14 are digital I/O pins, 6 are analog pins, 3 GND and single 5V,3.3V, Vin and reset pin, and more.Pin 1 is an anode pin of IR input within the Optocoupler. If you take a look at the Arduino board you will find that there are a total of 32 pins on it(excluding the ICSP header). Of course, you can add multiple tasks in a single program but they will be executed one by one. Unlike your laptop or mobile phone, it can run only one program at a time. Īrduino UNO is a simple microcontroller board without any operating system or powerful processor. You can say, atmega328p is the brain of the Arduino UNO development board. It is actually a development board that uses a microcontroller called Atmega328p to perform various functions. Is Arduino a Microcontroller or Microprocessor?Īrduino UNO is neither a microprocessor nor a microcontroller. Since this was the first official Arduino board released by the company, hence the word UNO in it. Yes, it’s a Latin word and does not have any full form. What is the full form of UNO in Arduino UNO? Mechanical Diagram of Arduino UNO Datasheet of Arduino UNO Rev3ĭownload the official Datasheet of Arduino UNO Rev3, from here. It also represents the successful flow of data. The TXD is used to transmit the data, and RXD is used to receive the data. TXD and RXD-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 interrupt on a low value, a rising or falling edge, or a change in value. When it’s value HIGH, it ignores the master. When a device’s Slave Select pin value is LOW, it can communicate with the master. This line is used for sending data to the peripherals.

MOSI-It stands for Master Output/ Slave Input.

This data line in the MISO pin is used to receive the data from the Slave.

MISO-It stands for Master Input/ Slave Output.

These are the clock pulses, that is used to synchronize the transfer of data. It is used by microcontrollers to communicate with one or more peripheral devices quickly. SPI stands for Serial Peripheral Interface.

Arduino un schematic in multisim