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Arduino & IoT Academy · Lesson

Measure Light with an LDR

Wire a voltage divider to read brightness.

What an LDR Is

An LDR is a light-dependent resistor. Its resistance drops in bright light and climbs high in the dark.

Resistance Tracks Light

Cover an LDR and its resistance soars; shine a lamp on it and resistance falls. That change is what you measure.

All lessons in this course

  1. Read a PIR Motion Sensor
  2. Measure Light with an LDR
  3. Set a Light Threshold
  4. Automatic Night Light
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