Measure the Vcc voltage applied to an Arduino

Scott Daniels has published an interesting tutorial on making use of the ability of an AVR to measure the internal 1.1V reference voltage. The resulting value can then be used to determine the voltage at Vcc – which is ideal for monitoring the project supply voltage, and also used to improve the accuracy of analog input readings and therefore any measurements following this. Very useful indeed – as when running from 5V the analogRead range falls below 5V and accuracy can suffer. 

For more information, visit Scott’s tutorial pagesAnd we’re on twitter and Google+, so follow us for news and product updates as well.


If you are new to Arduino, join in with our range of Arduino-compatible hardwareprototyping shields and module range. A good start is the Freetronics Eleven, the Arduino Uno-compatible board with onboard prototyping space:


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