Hello,I have a 5V Pro Mini Arduino I intend to connect to a 3.7V Lipo battery trough a step-up board (http://dx.com/p/lm2577-dc-3-5-18v-to-dc-4-0-24v-voltage-step-up-boost-module-red-154906)I would like a LED to be lit when the battery is getting empty. Can I connect the battery to an analog input of the Arduino trough a resistor and detect when the value decreases under a specific voltage threshold ? Or is there a better way to do it ?Thank you in advance.
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