12VDC battery monitor/data logger

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cjmoniz
 
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Joined: Wed Feb 22, 2012 8:01 pm

12VDC battery monitor/data logger

Post by cjmoniz »

I am looking for a battery monitor/ data logger that can monitor the voltage of a 12v battery. It would seem that the Arduino Uno Ethernet and the adafruit data logger would suit my needs well but what sensor can I use? Or how can I make it work? :?:

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philba
 
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Re: 12VDC battery monitor/data logger

Post by philba »

use a voltage divider to bring 12V down to something like 4V.
Image
Vout = Vin*R2/(R1+R2)
R1 = 10K and R2 = 5K would do it though that would eat .8mA. (10K is the recommended max impedance for the ADC.) If you need the keep the current draw lower, there are a number of techniques to use.

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cjmoniz
 
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Re: 12VDC battery monitor/data logger

Post by cjmoniz »

Thanks for the heads up. I am kinda new at this.

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