HC-SR501 overview
The PIR Motion Sensor Detector Module HC-SR501 allows you to sense motion. It is almost always used to detect the motion of a human body within the sensor’s range. It is often referred to as using “PIR”, “Pyroelectric”, “Passive Infrared” and “IR Motion” sensors. The module has an onboard pyroelectric sensor, conditioning circuitry, and a dome-shaped Fresnel lens. It has a delay time adjustment Potentiometer and sensitivity adjustment Potentiometer. Repeat Trigger Selection solderable Jumper is also available.
Key specifications
Voltage
5V – 20V
Power Consumption
65mA
TTL output
3.3V, 0V
Lock time
0.2 sec
Temperature
– 15 ~ +70
Datasheet
31227sc.pdf
HC-SR501 features
- Infrared Sensor with Control Circuit Board
- The Sensitivity and Holding Time Can be Adjusted
- Blockade time: 2.5s (Default)
- Sensitive Setting: Turn to the Right, Distance Increases (About 7M); Turn to the Left, Distance Reduce (About 3M)
- Time Setting: Turn to the Right, and Time Increases (About 200S); Turn to the Left, and Time Reduces (About 5S).
HC-SR501 pinout
| Name | Description |
|---|---|
| Vcc | The input voltage is +5V for typical applications. Can range from 4.5V- 12V |
| High/Low Output (Dout) | Digital pulse high (3.3V) when triggered (motion detected) digital low (0V) when idle(no motion detected |
| Ground | Connected to the ground of the circuit |
HC-SR501 applications
- Intrusion detection system: Detects human presence for security purposes.
- Smart lighting control: Controls lighting based on human presence to save energy.
- Automatic doors: Opens doors automatically when someone approaches.
- Occupancy monitoring: Counts the number of people present in a space for crowd management.
- Energy-efficient heating/cooling systems: Optimizes temperature control based on occupancy.
- Wildlife monitoring: Detects the presence of animals in specific areas.
- Home automation: Automates functions based on human presence.
- Interactive installations: Triggers effects when someone enters a specific area.
- Smart retail displays activate or change content when customers approach.
- Motion-activated cameras: Triggers cameras to record or capture images based on movement.
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