This little device when constructed draws about 2.5 mA from the battery it is connected across so for boats ,cars etc it can be left on all the time.It gives the battery voltage as a colour on an RGB LED .Very Low voltage -Flashing Red Under 11.5VLow Voltage -Red 11.5 to 11.9VUseable range -Green ...By: tytower
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from Instructables: exploring - technology - robots http://ift.tt/1wOMiig
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