Update 9/9/2014 ! the arduino can accept up to 5v on a analog input. our voltage can range as high as 20vdc in certain situations (open circuit pv voltage), so we designed a voltage divider that would provide 5v at 20v battery voltage, and less at various lower voltages.. 60mhz frequency meter / counter kit measures frequency from 10hz to 60mhz with 10hz resolution. it is extremely useful bench test equipment for testing and measuring frequency of oscillators, transmitters, radio receivers, function generators, crystals, etc. counter provides exceptionally stable readings and has excellent input sensitivity. Typically you get battery/alternator visit workshop warning when the electrical system voltage in the car is below 12.6 volt. when the car is running the alternator produces electricity and the voltage should be above 13.5 volt..
Www.doc-diy.net is a site for advanced do-it-yourself projects: photography, triggers, canon, audio, electronics. Installing the battery holder is the next step. i used a 2-cell holder made by cutting the two outer cell positions off of a side-by-side 4-cell holder.. Besides the above components you need a few more things like copper wire, mc4 connector, breaker, meter and fuses, etc. in the next few steps i will explain in details how you can choose the above components according to your requirement..
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