Enhanced PIR Motion Detector Module for Human Detection and Raspberry Pi Integration (HC - SR501)

PIR Sensor Modules: HC-SR501, HC-SR602, HC-SR505

🪶 The PIR (Passive Infrared) sensor modules - HC-SR501, HC-SR602, and HC-SR505 - are advanced motion detection devices that utilize pyroelectric infrared technology to sense human presence within a specified range. These sensors are versatile, sensitive, and ideal for various applications, including security systems, body-activated lighting, and automatic control for electronic devices. Below is a detailed overview of each model highlighting their features, technical specifications, and suitable applications.

HC-SR501

🪶 The HC-SR501 PIR sensor operates within a working voltage range of DC 5V to 20V, making it adaptable to a wide variety of power supply configurations. It consumes a mere 65 microamps during quiescent periods, allowing it to be efficiently utilized in battery-operated devices. With an adjustable delay time ranging from 0.3 seconds to 18 seconds, the HC-SR501 can provide flexible activation periods based on project requirements.

🪶 Designed with a cone angle of up to 120 degrees, it boasts a detection distance of approximately 7 meters, ensuring effective coverage for motion detection. The sensor features two trigger modes: a non-repeatable mode, which deactivates the output after the delay period, and a repeatable mode where the output remains active as long as movement is detected within the sensing range. This adaptability increases the sensor's utility in different contexts.

📦 Additional features include an adjustable blackout time of 0.2 seconds to inhibit false triggers, an optional light control setting for daytime operation, and simple connectivity to existing circuits. The compact PCB dimensions of 32mm x 24mm make installation straightforward.

HC-SR505

📦 The HC-SR505 is a compact PIR sensor module specifically designed for ultra-low power consumption, operating at a voltage range of DC 4.5V to 20V. It features an incredibly low static current consumption of less than 60 microamps, perfect for devices powered by batteries. The sensor has a detection angle of less than 100 degrees and a range of up to 3 meters, making it apt for tight spaces where motion detection is needed.

🧩 This model also supports a repeatable trigger mechanism, which maintains a high output signal if movements are continuously detected, extending the activity window effectively. The delay time is set by default at approximately 8 seconds, but it can be customized as per specific needs, with options available from a few tenths of a second to tens of minutes.

📦 Measuring only 10mm x 23mm, the HC-SR505's small PCB dimensions ensure it can fit into compact electronic devices seamlessly. Its high signal output simplifies integration with a variety of circuits, enhancing its flexibility for diverse applications like body induction lamps, security systems, industrial automation, and toy products.

HC-SR602

💍 The HC-SR602 module is particularly suited for applications requiring a sensitive motion detection system. Operating under a voltage range of 3.3V to 15V with a quiescent current of merely 20 microamps, this sensor is an excellent choice for various energy-efficient projects. The sensing distance extends up to 5 meters, with an optimal range recommendation of 0 to 3.5 meters, providing versatility in installation options.

🔧 With features like adjustable high-level output time from 2.5 seconds to 1 hour and a default trigger setting that allows repeatable activations, the HC-SR602 is designed for dynamic environments. Upon detecting motion, it outputs a high signal for the configured duration, followed by a standby state, which can be adjusted by modifying a resistor.

🕊️ The sensor's lightweight design facilitates easy integration and installation into a wide range of devices, including security alarms, automatic agricultural equipment, and intelligent control systems. Users can customize its functionality further by incorporating light-sensitive components for day/night operations.

Conclusion

📦 In summary, the HC-SR501, HC-SR602, and HC-SR505 PIR sensor modules offer a range of advanced features catering to various motion detection needs. Their low power consumption, adjustable outputs, and compact design make them ideal solutions for innovative DIY projects, home automation, and security applications.