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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).
What is Arduino Vin pin?
Power Pins VIN (sometimes labelled “9V”). The input voltage to the Arduino board when it’s using an external power source (as opposed to 5 volts from the USB connection or other regulated power source). You can supply voltage through this pin, or, if supplying voltage via the power jack, access it through this pin.
What is the Ioref pin used for on an Arduino board?
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 does the AREF pin do on an Arduino?
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).
What does the AREF pin do on a mbed?
It Configures the reference voltage used for analog input (i.e. the value used as the top of the input range). For Mbed Nano Boards there is no AREF pin on the microcontroller and the only references to be used with the ADC are the internal ones. So in the MBED boards, the AREF pin is not connected to anything.
When to use analogReference in Arduino Stack Exchange?
In fact, the documentation suggests that for SAMD boards (MKR1000 is based on Zero) a different enumeration should be used where each value is prefixed with AR_ so for example you should use analogReference (AR_EXTERNAL);. Thanks for contributing an answer to Arduino Stack Exchange!
Where does the 3.3V pin come from on an Arduino?
This can come from a regulated power supply, or if you need 3.3V you can get it from the Arduino’s 3.3V pin. If you are using an external power supply, be sure to connect the GND to the Arduino’s GND pin.