Description: 1. HC-SR501 Overview: The HC-SR501 is a combination Passive Infrared (PIR) Sensor and Infrared (IR) Proximity Sensor, designed for motion detection and object presence sensing in Internet of Things (IoT) projects and various automation applications. 2. PIR Sensor Functionality: The PIR part of the sensor identifies changes in heat signatures within its detection range, typically used to trigger actions when motion is detected, such as turning on lights or activating alarms. 3. IR Proximity Sensor Functionality: The IR proximity sensor detects objects based on their proximity within a specific distance range; it sends an output signal when an object breaks the IR beam. 4. Detection Range: HC-SR501 offers a wide detection angle (up to 110 degrees) for PIR motion sensing, while IR proximity sensing has a shorter range, typically up to around 10 cm. 5. Power Requirements and Consumption: The sensor operates on a DC power supply of 5V with a current consumption of approximately 25mA. I
| Specification | Details |
|---|---|
| Detection Range | Up to 12 meters (depending on sensitivity) |
| Sensitivity Adjustment | 3-pin adjustment for sensitivity level |
| IR Proximity Detection | Detects objects within a short range (approx. 1-5 cm) |
| Power Consumption | Typically around 70 μA (standby) 50-60 mA (active) |
| Output Type | Digital output: normally low goes high when motion detected |
| Operating Voltage Range | 4.5V to 20V (with voltage regulator) |
| Supply Current | Typically around 10 μA (standby) 50-60 mA (active) |
| Response Time | Around 30 seconds (delay between detections) |
| Reset Pin | Active low reset pin for resetting the sensor |
| Pinout | VCC OUT and TRIG (sensitivity adjustment) pins |
| Package Type | Small plastic package with leads (TO-220 style) |
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