i am building a rig to power my AV Devices (Camera, Harddisk-Recorder etc.pp.) using a V-Mount Battery and a Voltage Converter like this: http://www.lanparte.com/html/129.html
Basically the converter transforms the 14.4v V-Mount Battery output to all sorts of voltages commonly used in the video world. I have a problem though that i need to analyze, because on one port the voltage seems to be dropping occasionally, causing my camera to reset.
I was looking into multimeters with USB Logging output, but the time-resolution (1 measurement per second) seems not exact enough to find the cause. Then i tried to find "multimeter" shields for the arduino, without success. Seriously, right now i don't want to go into building my own voltage dividers, as - as far as i understand electronics - they should use involve isolated circuits as the V-Mount batteries are quite powerful and i dont want to do anythin wrong, as i am not very experienced with electronics.
I found this, which seems perfect: http://www.phidgets.com/products.php?category=8&product_id=1135_0
but additionally to the 19$ for the sensor, they charge almost 50$ shipping which is out of the question. Can anyone advise a not so pricy, accurate solution for what i want to do: like i said, i would happily buy a shield but i didnt find any. So whats the best way to go for me?