PIR HC-SR501 Motion Sensor

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The HC-SR501 Pyroelectric Infrared Sensor is used to detect the presence of people. It is commonly used in turning the lights on and off automatically when people arrive or leave. It is very reliable for robot projects which need human detection.

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JOD 0.75
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Overview

The HC-SR501 sensor is based on pyroelectric infrared technology, it features high sensitivity, high reliability, and low-voltage operation. It is widely used in alarms and auto-sensing electrical equipment, especially in battery-operated products.

Specifications:

  • Operating Voltage Range: 5 V to 20 V
  • Power Consumption: 65 mA
  • TTL Output: 3.3 V, 0 V
  • Lock Time: 0.2 sec
  • Sensing Range: <120°, within 7 meters
  • Temperature Range: -15° C to +70°
  • Dimensions: 32 mm x 24 mm

The HC-SR501 infrared sensor is used to detect human presence. It is often used to automatically turn the light ON/OFF in a room when a person arrives or leaves a room.

The sensor is based on IR technology, provides reliability in your projects and a low operating voltage.

It supports a high supply voltage range (5 - 20 V) and has a low consumption. It has a sensitivity radius of 110 ˚ and detects objects up to a distance of 7m.

The white plastic cover works like a divergent lens that allows the sensor to detect objects over a much wider range. The sensor makes "readings" at adjustable time intervals, between 0.3 sec and 5 min.

Using with Arduino

pir-hc-sr501.jpg

The sensor is very easy to use, requiring a single digital pin. We used pin 8. For more details see the data sheet.

For code 31.0, see the book "Introduction to Arduino"

'Introduction to Arduino' book

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PIR HC-SR501 Motion Sensor

PIR HC-SR501 Motion Sensor

The HC-SR501 Pyroelectric Infrared Sensor is used to detect the presence of people. It is commonly used in turning the lights on and off automatically when people arrive or leave. It is very reliable for robot projects which need human detection.

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