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Arduino & IoT Academy · Lesson

Handle Failed Reads

Detect NaN and retry without crashing.

Reads Can Fail

Even a good sensor sometimes returns nothing useful. Loose wires, fast polling, or noise can cause a failed read, so plan for it. ⚠️

Meet NaN

When a read fails, the library returns NaN, which means Not a Number. It is the sensor's way of saying I did not get a value.

All lessons in this course

  1. Wire the DHT11/DHT22
  2. Install the DHT Library
  3. Read Temperature & Humidity
  4. Handle Failed Reads
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