24.08.2017
Battery-powered Arduino
Running an Arduino on battery power is only useful, if you know, when to change the battery. Here it is handy, to measure the current battery level and get notifications, if it drops below a certain threshold. Thankfully you can use the analog Pins to measure a voltage. If you attach a voltage to e.g. A0, your Arduino will compare the input voltage with a reference voltage (by default VCC) and return a value between 0-1023 where 1023 means, that the input voltage is equal or higher than VCC.
