PIR (Passive Infrared) Motion Sensor Detector Module HC-SR501 (Buy 3 & Get 1 LED))

Description

Here are the basic specifications for the HC-SR501 PIR Motion Sensor Detector Module:

1. **Operating Voltage:** 4.5V to 20V DC (typically 5V)

2. **Current Consumption:**
– Standby Mode: <50μA
– Active Mode: 50mA (at 5V DC)

3. **Detection Range:** Approximately 3 to 7 meters (10 to 23 feet)

4. **Detection Angle:** Approximately 110 degrees

5. **Output Signal:** High-level output signal (typically 3.3V or 5V) when motion is detected

6. **Time Delay:** Adjustable time delay, typically ranging from 3 seconds to 5 minutes

7. **Sensitivity:** Adjustable sensitivity via an onboard potentiometer

8. **Operating Temperature:** -15°C to +70°C

9. **Dimensions:** Approximately 32mm x 24mm

10. **Output Pin:** Typically labeled as “OUT” or “DO,” this is where the high-level output signal is provided when motion is detected.

Keep in mind that while these are the general specifications for the HC-SR501, there might be slight variations in performance among different modules or manufacturers. It’s a versatile and widely used motion sensor module, commonly employed in DIY electronics projects and commercial applications for motion detection and automation purposes.

—————————————————————————————————————-

**Key Features:**

1. **Passive Infrared Sensor:** The HC-SR501 is a passive sensor, which means it doesn’t emit any radiation itself but rather detects the infrared radiation emitted by objects in its field of view.

2. **Detection Range:** It has a typical detection range of about 3 to 7 meters (10 to 23 feet) and a detection angle of approximately 110 degrees.

3. **Adjustable Sensitivity:** You can adjust the sensitivity of the module using the onboard potentiometer. This allows you to fine-tune the module’s response to motion.

4. **Adjustable Time Delay:** The module also features an adjustable time delay, which determines how long the output signal remains high after motion is detected. You can set this delay to suit your specific application.

5. **Output Signal:** When motion is detected, the module provides a high-level (usually 3.3V or 5V) output signal on its output pin. This signal can be connected to a microcontroller or other devices for further processing.

**How It Works:**

1. **Infrared Sensing:** The HC-SR501 module contains a pyroelectric sensor, which is sensitive to infrared radiation. When an object, such as a human or animal, moves within the detection range, it emits infrared radiation that the sensor can detect.

2. **Signal Processing:** The module includes a signal processing circuit that amplifies and processes the sensor’s output. It also compares the current signal with the previous signal to detect changes, such as motion.

3. **Output Signal:** If motion is detected, the module’s output pin goes high for the duration of the set time delay. This high signal can trigger an action, such as turning on lights, activating an alarm, or capturing images with a camera.

The HC-SR501 PIR motion sensor module is widely used in various applications, including home automation, security systems, lighting control, and robotics. It’s relatively easy to use and is compatible with many microcontrollers like Arduino and Raspberry Pi. When implementing this module, consider the sensitivity, time delay, and detection range settings to tailor its behavior to your specific needs.