![]() Voltage sources made of single cell LiPo or LiIon, along with some single or multi-cell NiCd configurations (like up to 3 AA or AAA), are not able to provide the suggested 5.0 volts input to your board and a voltage booster can solve your problem. The sense pin wiring can vary depending on your battery configuration, but here are a few examples based on the assumption you are using a 5V board: in case of a 3.3V board you should be performing the necessary adjustments. To improve this we suggest using the VoltageReference library to obtain a better calibration value for all analog readings. ![]() If you want your readings to be more accurate we strongly suggest to calibrate the library by providing your board reference voltage: most of the times you assume your board has exactly 5V between Vcc and GND, but this is rarely the case. The library requires at least 1 analog pin (we will call this the sense pin) and no less than 2 pieces of info on your battery: the voltage you will consider the minimum acceptable level, below which your project/product becomes unreliable and should be shut down, and the maximum voltage you can expect when the battery is fully charged.Īdditionally, you can provide a second pin (either analog or digital) to activate the battery measurement circuit (we call it the activation pin), useful in all those situations where you can sacrifice a pin to further increase your battery duration.
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