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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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.
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