12VDC battery monitor/data logger
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- cjmoniz
- Posts: 2
- Joined: Wed Feb 22, 2012 8:01 pm
12VDC battery monitor/data logger
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?
- philba
- Posts: 387
- Joined: Mon Dec 19, 2011 6:59 pm
Re: 12VDC battery monitor/data logger
use a voltage divider to bring 12V down to something like 4V.
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.
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.
- cjmoniz
- Posts: 2
- Joined: Wed Feb 22, 2012 8:01 pm
Re: 12VDC battery monitor/data logger
Thanks for the heads up. I am kinda new at this.
Please be positive and constructive with your questions and comments.