my recent reads..

LEAP#333 Measure Thy Own Voltage

One of the issues with analogue measurements on the Arduino is that typically we assume an accurate 5V reference, and need to add fudge factors for a calibrated reading. Well, I borrowed some code and re-read the ADC part of the datasheet again, and there is a neat little trick for using the 1.1V internal voltage reference to measure (thus calibrate) the supply voltage. It works, but not without caveats - so although QI, I’m afraid the net result may not be much of an improvement! As always, all notes, schematics and code are in the Little Electronics & Arduino Projects repo on GitHub hero_image