See About ADC reference voltage on Portenta H7. The AREF pin is not connected to anything.Īny external voltage applied to the AREF pin will be automatically used as the reference. The microcontroller only supports internal reference. Due to the many numbers of pins, it is not usually used for common projects but you can find them in much more complex ones like Radon detectors, 3D printers, temperature sensing, IOT applications, real-time data monitoring applications etc. Load a blank sketch on the Mega, then just look at the raw data coming from TX0/RX0 that passes out the USB cable with any serial monitor set to the right baud rate. The arrows printed on these Mega pins hint at this 'backwards' connection. Note: To avoid damaging your board, read the library reference's notes and warnings section before using an external reference voltage. Hook GPS board RX to RX0 (Digital pin 0) and TX to TX0 (Digital pin 1). analogReference(EXTERNAL) for AVR boards. The data sheet mentions that DC Current per I/O Pin is 40 mA but the analog pins are inputs. Enable it by calling analogReference() with the appropriate option for your board, i.e. It has 54 digital input/output pins (of which 15 can be used as PWM outputs), 16 analog inputs. The options are: Arduino AVR Boards (Uno, Mega, Leonardo, etc.) INTERNAL: a built-in reference, equal to 1.1 volts on the ATmega168 or ATmega328P and 2.56 volts on the ATmega32U4 and ATmega8 (not. The Mega 2560 is a microcontroller board based on the ATmega2560. the value used as the top of the input range). By default they measure from ground to 5 volts, though is it possible to change the upper end of their range using the AREF pin and analogReference() function. Configures the reference voltage used for analog input (i.e. The board accommodates the ATmega2560 microcontroller, which operates at a frequency of 16 MHz. The Mega 2560 has 16 analog inputs, each of which provide 10 bits of resolution (i.e. Arduino Mega 2560 is an exemplary development board dedicated for building extensive applications as compared to other maker boards by Arduino. Arduino AVR Boards (Uno, Mega, Leonardo, etc.)Įxternal reference voltage can be read from the AREF pin. See also the mapping Arduino Mega 2560 PIN diagram.Not all boards have an enabled AREF pin, and it doesn’t work the same way on all boards that do: No programming logic required to adjust reference voltage.Precise control of reference value (instead of a limited number of built-in options).The reference voltage essentially specifies the value for the top of the input range, and consequently each discrete step in the converted output.Īdvantages of using an external reference include: The AREF (Analog Reference) pin can be used to provide an external reference voltage for the analog-to-digital conversion of inputs to the analog pins.
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