Battery voltage read

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hi have 2 problems battery voltage indicator


int sensorvalue = analogread(a2);
float voltage = sensorvalue * (5.00 / 1023.00);


1.voltage value incorrect how tweak it?

2.if battery voltage goes down voltage value increase how fix it?



sorry english :d


quote
2.if battery voltage goes down voltage value increase how fix it?
use 1.1 v internal reference.


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