What is analogue reference?

It is the reference voltage against which all other analog voltages (analog inputs) are measured against. By default it is the same as the chip supply voltage (5V on most Arduino boards), so the analog inputs can measure between 0 and 5V.

What is analog reference pin?

AREF means Analog REFerence. It allows us to feed the Arduino a reference voltage from an external power supply in order to configure the reference voltage used for analog input (i.e. the value used as the top of the input range).

How do I choose a voltage reference?

Choosing a Reference

1. Is the supply voltage very high?
2. Does the supply voltage or load current vary widely?
3. Require high power efficiency?
4. Figure your real-world temperature range.
5. Be realistic about required accuracy.
6. What is the real supply range?
7. How much power can the reference consume?
8. How much load current?

What is ADC reference voltage?

ADCs convert analog inputs that can vary from zero volts on up to a maximum voltage level that is called the reference voltage. The reference voltage determines the ceiling of what the ADC can convert, and is essentially the yardstick against which every proportion and result is measured.

What is Ioref?

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 is precision reference?

The voltage reference is used to produce a precise value of output voltage for setting the full-scale input of the data conversion system. Precision voltage references are available with varying degrees of precision and initial accuracy over some operating temperature range.

How does voltage reference affect ADC performance?

The series voltage reference provides better performance in all of these categories. where “Code” is the ADC output code in decimal form, VIN is the analog input voltage to the ADC, n is the number of ADC output bits, and VREF is the analog value of the ref- erence voltage to the ADC.

What is IORef in Arduino Uno?

What are PWM pins used for?

Pulse Width Modulation, or PWM, is a technique for getting analog results with digital means. Digital control is used to create a square wave, a signal switched between on and off.