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This function will provide the correct value to use.
Unfortunately, this procedure will not provide that result.
Lastly, the code provided will support all the Arduino variants, including the new Leonardo, as well as the ATtinyX4 and ATtinyX5 series chips.
One of the articles I cited earlier made the claim that this function could be used to improve the accuracy of the analog measurement in cases where Vcc wasnt exactly.0 volts.Feel free to experiment with your own measurements.Most AVR chips provide three possible sources an internal.1 volt source (some have.56 internal voltage source an external reference source or Vcc.Improving Accuracy, while the large tolerance of the internal.1 volt reference greatly limits the accuracy of this measurement, for individual projects we can compensate for greater accuracy.This feature can be exploited to improve the accuracy of the Arduino function analogRead when using the default analog reference.Calculate the value of Vcc.The internal reference is stable, but has about a /- 10 error.Such a measurement could be less accurate than our power supply for the Arduino!Why would anyone want to do so?This entry was posted in Tech and tagged arduino, attiny.How-To, many AVR chips including the ATmega series and many ATtiny series provide a means to measure the internal voltage reference.You can use a stable voltage reference close.0 volts without having to rely on your Vcc actually being.0 volts.Making accurate ADC readings on the Arduino, and, secret Voltmeter.
That means that any measurement of Vcc could be off butik bonus instagram by as much.
I first learned of this technique from these articles.

You could also use it to determine if you are connected to a power source or running from batteries.Then, replace the constant 1125300L with a new constant: scale_constant internal1.1Ref where internal1.1Ref.1 * Vcc1 (per voltmeter) / Vcc2 (per readVcc function).Solving for Vcc, we get: Vcc.1 * 1023 / ADC-measurement.To do so, simply measure your Vcc with a voltmeter and with our readVcc function.Secret Arduino Voltmeter Measure Battery Voltage by Provide Your Own is licensed under a Creative Commons Attribution-ShareAlike.0 International License.There is one caveat though.Putting it altogether, heres the code: long readVcc / Read.1V reference against AVcc / set the reference to Vcc and the measurement to the internal.1V reference #if defined AVR_ATmega32U4 defined AVR_ATmega1280 defined AVR_ATmega2560 admux _BV(refs0) _BV(MUX4) _BV(MUX3) _BV(MUX2) _BV(MUX1 #elif defined AVR_ATtiny24 defined.
A common assumption when using analogRead is that the analog reference voltage.0 volts, when in reality it may be quite different.