In my project I use a 8 bits resolution ADC to measure battery . 3.0 V as 100% and 2.2 V as 0%.
When input is 3.0 V the ADC value is 255 and 2.2 V for 180. Because it's unnecessary to be very accurate so I use simple equation y = ax +b to calculate the percentage of the battery.
100 = 255 a + b ........ (1)
0 = 180 a + b ........ (2)
Use 1 and 2 we can calculate a = 4/3 and b = -240.
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