HC-SR501 PIR Motion Sensor

Passive infrared sensor for motion detection. Digital high/low output. Adjustable sensitivity and delay time.

Sensor HC-SR501 motion gpio Draft

This entry is draft and has not been confirmed against physical hardware. A conforming tool will refuse to provision it. The datasheet is the authority, not this page.

Specifications

Protocol gpio
Sensor type motion
Model number HC-SR501
Read interval seconds 1

Readings

SlugDevice classUnitRange
motion-detected motion - 0 to 1

Wiring

PinRequiredNotes
out Yes Push-pull 3.3V output. Safe on a Raspberry Pi GPIO input.

Supply: 5V

Failure modes

  • Requires roughly 60 seconds after power on to stabilise. Output is unreliable and often latched high during that window.
  • On-board potentiometers set sensitivity and hold time in hardware. Two physically identical modules will behave differently unless both pots are matched.
  • Hold time means the output stays high for a fixed period after the last detection. Edge counting during that window measures nothing.
  • Triggers on moving heat, not on people. Sunlight through glass, heating pipes and pets all register.

Entry

Keyhc-sr501
StatusDraft
Revision1
Registry0.3.0
Entry on GitHub JSON for agents

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