🔢 PART 3 — ANALOG INPUT

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Last updated 7:09 AM on 9/13/26
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6 Terms

1
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What is the resolution of the Arduino Uno's analog input?


10-bit resolution.

2
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How many different levels can a 10-bit analog input represent?


210=10242^{10}=1024

Therefore:

1024 levels

3
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What numerical range does analogRead() return on an Arduino Uno?

0–1023

That's 1024 possible values.

4
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What does an analog reading of 0 represent?


A voltage near 0 V.

5
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What does an analog reading of 1023 represent?

A voltage near the Arduino's reference voltage, approximately 5 V on a typical Uno setup.


6
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What does an analog reading around 512 represent?

Approximately half of the input voltage range.

For a 5 V reference:

512/1023​×5≈2.5V