Sensor
HC-SR501 PIR motion sensor
Detects warm bodies moving up to ~7 m away. The classic security-project sensor.
Pinout
- VCCpower (5 V)
- OUTdigital
- GNDground
Bench notes
Give it 30–60 s to settle after power-up, and turn both trim pots fully counter-clockwise to start.
- Typical price
- $1.50
- Libraries
- none needed
- Prompt keywords
- motion, pir, presence, intruder