PIR (Passive Infrared) Motion Sensor Detector Module HC-SR501

price/Rs. 120.00 off/Rs -22 off Specification Operating Voltage: 3.6V to 5V DC Adjustable potentiometer to adjust the sensitivity LM393 comparator IC for digital output Easy to install thanks to bolt hole provided Digital Output Description The LDR (Light Dependent Resistor) sensor module is an electronic component used to detect and measure light intensity. It is commonly used in various applications such as automatic lighting systems, solar panels, burglar alarm systems, and photography equipment. Here is a description of the LDR sensor module: 1. Light Dependent Resistor (LDR): The core component of the module is the LDR itself. It is a type of resistor whose resistance changes in response to the amount of light falling on it. When exposed to light, the LDR's resistance decreases, and in darkness, its resistance increases. 2. Signal Conditioning Circuit: The LDR sensor module typically includes a signal conditioning circuitry that processes the varying resistance of the LDR and converts it into a usable output signal. This circuitry may include an amplifier, a comparator, and/or a voltage regulator. 3. Power Supply: The module requires a power supply to operate, typically in the range of 3.3 to 5 volts DC. The power supply can be provided externally or derived from the main system power source. 4. Analog Output: The LDR sensor module often provides an analog output signal that represents the detected light intensity. The output voltage or current level varies proportionally with the light falling on the LDR. This analog signal can be connected to microcontrollers, analog-to-digital converters (ADCs), or other devices for further processing. 5. Sensitivity Adjustment: Some LDR sensor modules come with a sensitivity adjustment feature. This allows users to fine-tune the module's response to light by adjusting a potentiometer or trimmer resistor. 6. Digital Output (Optional): In certain applications, LDR sensor modules may also offer a digital output signal. This digital output is typically a binary signal (high or low) that indicates whether a specific light intensity threshold has been crossed. 7. Mounting Options: LDR sensor modules often come with mounting holes or slots, making it easy to attach them to a surface or integrate them into a project. 8. Light Protection: To prevent the LDR from being affected by stray light or ambient light sources, the module may include a protective casing or cover. This helps to ensure accurate light intensity measurements. Overall, the LDR sensor module is a versatile device that allows for the detection and measurement of light intensity in various applications. Its simplicity, affordability, and ease of use make it a popular choice among hobbyists, students, and professionals working with light-related projects. 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. 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. 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.