The scenario
An Arduino reads an LDR for ambient light and a PIR for motion. If it's dark and motion is detected, the light turns on for 5 minutes, then turns off. Otherwise, no action is taken.
What is in this drawing
Read the decisions behind it.
01
Is the ambient light below threshold (dark)?
02
Is motion detected by the PIR sensor?
Use this flowchart when designing a simple, event-driven smart lighting system that reacts to room occupancy only in low-light conditions.
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