Hi All, A project I'm working on I need to measure the charge of a 9V battery. Essentially it's a voltmeter. Using the analogue inputs on a Uno (the end project will just be a stand alone ATmega328), I need to scale back the 9V to under 5V. I was told to use a voltage divider as per this site: htt…

Help with voltage divider and measuring a 9V battery

system October 4, 2012, 4:37am 4

Used a 47k and 67k - works great. No heat whatsoever.

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