Which circuits is used with Aref pin when we provide external power supply?

analogReference() Arduino AVR Boards (Uno, Mega, Leonardo, etc.) EXTERNAL: the voltage applied to the AREF pin (0 to 5V only) is used as the reference.

What is Ioref pin Arduino?

IOREF. This pin on the Arduino/Genuino board provides the voltage reference with which the microcontroller operates. A properly configured shield can read the IOREF pin voltage and select the appropriate power source or enable voltage translators on the outputs to work with the 5V or 3.3V.

What can I use Arduino analog pin for?

A/D converter While the main function of the analog pins for most Arduino users is to read analog sensors, the analog pins also have all the functionality of general purpose input/output (GPIO) pins (the same as digital pins 0 – 13).

What is a pin in Arduino?

Pins (5V, 3.3V, GND, Analog, Digital, PWM, AREF) The pins on your Arduino are the places where you connect wires to construct a circuit (probably in conjuction with a breadboard and some wire. They usually have black plastic ‘headers’ that allow you to just plug a wire right into the board.

How does Arduino read analog voltage?

Arduino analog pins read a voltage that is expected to range from 0V to 5V. A standard way to turn a resistance change in a thermistor into a voltage change that the Arduino analog pin can read is to create a voltage divider circuit.

How many pins are there in the Arduino Uno?

Arduino Uno has 14 digital input/output pins (out of which 6 can be used as PWM outputs), 6 analog input pins, a USB connection, A Power barrel jack, an ICSP header and a reset button. The 14 digital input/output pins can be used as input or output pins by using pinMode (), digitalRead () and digitalWrite () functions in arduino programming.

What is the voltage of Arduino?

The Arduino has a narrow operating voltage around 5 Volts (3.3 Volts in some) and is sensitive to variation in this voltage. The Arduino design is based on the assumption that a stable 5 Volt power source will be feeding the chip at the heart of the Arduino.