monitoring 24 volt battery using pic microcontroller

[satisharyal]

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

 

[barry]

Um, a voltage divider?

 

[jayanth.devarayanadurga]

5k and 1.3k?

 

[satisharyal]

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

 

[barry]

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

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

Why don't you just use two resistors?

 

[satisharyal]

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

Why don't you just use two resistors?

but i think there will be excess power dissipation in resistor

 

[jayanth.devarayanadurga]

Why don't you try with resistor first and see.

 

[bigdogguru]

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

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

 

[barry]

but i think there will be excess power dissipation in resistor

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.

 

[ZASto]

Here's an ideal circuit for you.

 

[barry]

Here's an ideal circuit for you.

You forgot the plutonium.

 

[ZASto]

:-D