Hello, I'm new with arduino and so bad at practic electronics, I'm doing an arduino drone for an important research project. I did a powerful drone (22,3 V), I transformated that voltage to 9V using an LM317 circuit to give power to the nano board, but I need to do a parallel circuit to an analogic pin to read the voltage (LiPo batteries need to work in a preventive margin to avoid exploding). So I need to choose the resistance to reduce from 9 volts to the five requiered when it has top voltage, so I can read the voltage of the battery, wich decreases with time. The problem is that I don't know the consume of the analogic pins to calculate the appropiate resistor using Omh's law. I need the data for activating a buzzer when battery lows and avoid overdischarging.
Thanks, but a small question, I need to only enter one pin, one cable, and I have output from this circuit:
What I should do with the negative one?
There is no consume by the pin!!!! The consume is by a voltage divider and the pin is connected to the point where the TWO resistors of the divider are connected. One end of the divider is + the other end of the divider is ground where the - of your power is also connected.
Thanks!
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