Setting the reference voltage for an ADC (such as the analog pins on an Arduino Uno) is important to maximize the precision and accuracy of your readings, and if you're trying to use something like a voltage divider instead of a proper reference voltage chip or zener diode regulator, there are a few extra considerations to account for.
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Негізгі бет ADC Reference Voltage - How To Supply It Without A Reference Chip - Simply Put
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