Howsit Guys
I need to build something to monitor the level of my car battery (this is part of a bigger project that ive started). I know there is alot of noise from the battery as well as the small problem of the battery been 24v.
Could anyone point me in the right direction to a tutorial or previous project or something that could help me achieve this.
What do you want to monitor? The voltage of the will battery will be distorted by the battery charger. So it will not give you an indication of the state of the battery except when the engine is off.
Measuring 24V is easy, just use a potential divider and lots of filtering to get rid of the noise. You will probably need about 30v full scale.
Do you want to measure charging current? You will need a current probe for this.
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1277653199/8
he did a pretty impressive job for wanting to monitor his battery voltage.