Battery voltage monitoring for use on 16F1825

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  1. - 14th April 2013, 12:22 #10
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    Charlie
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    Default Re: Battery voltage monitoring for use on 16F1825

    You can reduce the complexity with an N-channel FET by changing the order from +3.3V / FET / LED / R / GND to 3.3V / LED / R / FET / GND. Now R12 can be replaced with a piece of wire. Set the voltage divider to be about 3V when the battery is at maximum, and choose a FET that is full on with VGS ~1V.

    By the way, if you are using a high powered LED, they typically have a forward volt drop closer to 3V, so your 100 ohm resistor might be too large.
    Last edited by Charlie; - 14th April 2013 at 12:25.
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