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can i make battery life indicator that tells whether the battery is low? Answered

the battery indicator is like in the cellphone; where you can tell that ur phone needs to charge.


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frollard (author)2009-10-29

A battery meter isn't anything special - it just measures the voltage of the battery and compares it to what the batter should put out at full charge.  Say a battery is charged at 1.5 volts and dead at 1.1 volts, then you just convert the measured difference (.4 volts) to 0-100% charge.

You can go a step further by sensing how much current is being drawn, and using the known capacity of the battery you can estimate the battery runtime remaining.

Long story short:  There are several circuits for this:



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Re-design (author)2009-10-28

Sure.  What are the details of the battery?

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