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hi,
I was wondering, im building a raspberry pi laptop, and I need a way to tell if the battery is low. so, what part would I need to get if I get 2 LED'S, and I want the blue one to be on if the battery is full and the amber one to be on if it gets below 4.5 volts (with a 7.5 volt battery) OR if I have a multi-colored one how would I do it if the same thing applies except with a multi colored one. thx in advanced.
Hi Alex,
I have found the circuit that will help you , it uses The LM 3914 it has ten comparators, which are internally assembled in the voltage divider network based on the current-division rule. So it divides the battery level into ten parts !!
you can read more about this circuit at http://www.electronicsforu.com/electronicsforu/circuitarchives/view_article.asp?sno=137&article_type=1&id=433&tt=unhot&b_type=new
