Hi, I'm hoping to use the arduino to mesure a battery's stats - mainly its voltage, temprature, amps and watt's being consumed - while its powering an electric car around a track. I need help with getting sensors for the mesurements i.e. how do i mesure the amps and read it in the programing. I have datalogging code so thats fine. The battery is 24V and i also need it to power the arduino. Can someone please help (submit a circuit diagram / programming snippets) me with this. I particulary need circuits that will give the arduino (through the anolouge inputs) voltage, amp and watt information.
First off you don't measure the watts you calculate it from the measured voltage and current.
Do you know what range of current you want to measure, hall effect current sensors only give you values down to about half an amp.
24V is a bit on the high side for powering an arduino, you have to look at the capacitor voltage ratings.
Finally are you looking to learn how to design such a system or do you just want to build one?
Thanks for the clarification we now know what you want. A design complete with schematic and software.
Now it is just a matter of seeing if anyone has come across one for you.
You might consider making a post on the Adafruit Job board. You appear to be asking for quite a bit of work. Perhaps someone there would be willing to invest the time necessary for a small fee.
