monitoring 24 volt battery using pic microcontroller

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satisharyal

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i need to monitor 24v li-ion battery using pic microcontroller. How can it be possible because pic can have maximum 5 volt input.. any suggestion please
 

i am thinking of using ltc3115-1 dc/dc converter and connect with pic16f877a and using pwm to monitor the battery voltage.... this just my conceptis it possible or not
 

satisharyal said:
i am thinking of using ltc3115-1 dc/dc converter and connect with pic16f877a and using pwm to monitor the battery voltage.... this just my conceptis it possible or not
Click to expand...

Wow, maybe you should put some vacuum tubes and a bicycle pump in there, too.

Why don't you just use two resistors?
 

satisharyal said:
i am thinking of using ltc3115-1 dc/dc converter and connect with pic16f877a and using pwm to monitor the battery voltage.... this just my conceptis it possible or not
Click to expand...

If you are will to go to these extremes, why not utilize a device which is intend for this specific purpose, like a Li-ion Battery Management Chip.

There are numerous battery management devices available, many can be readily interfaced with a microcontroller.


BigDog
 

satisharyal said:
but i think there will be excess power dissipation in resistor
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What makes you say that? You can pick any value resistors you want, assuming your ADC input impedance is high enough. And if the impedance ISN'T high enough, you can use an opamp.
 

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