Love-o-meter ADC conversion

Hardware The Arduino Starter Kit
#1

Hello, i have a quick question. In the third project of the starter kit we convert the ADC reading to voltage. The adc is 10 bit so the values are 0-1023 and the voltage range is 0-5V. So shouldn't the conversion be:

sensorVal = analogRead(A0);
voltage = sensorVal/1023.0 * 5.0

In the tutorial book it's:
voltage = sensorVal/1024.0 * 5.0
and i am a bit confused as to why it is divided by 1024 and not 1023.
Thanks in advance!

#2

analogRead() can give you one of 1024 possible values. If you want to know which one it is, divide by 1024.

#3

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