01Human Sensing LightThe human sensing light is a product designed and developed using infrared and pyroelectric principles to detect human activity information.02Device Preparation
PIR*1, LED light*1, resistor*1, breadboard*1, mainboard*1, Dupont wires*5
03Connection Diagram
04Program Display
05Extended Content
1.Q&A: What is a PIR sensor?
PIR(Passive Infrared Sensor): is an electronic component that can detect human heat. It senses the presence of a person by detecting infrared radiation in the surrounding environment, and is widely used in security,smart homes, and automation control among other fields.
The PIR sensor is a passive infrared sensor, which means it does not emit any form of energy itself, but relies on detecting infrared radiation emitted by objects in the surrounding environment (especially humans). Warm objects like humans and animals emit heat in the form of infrared radiation, which has wavelengths between 300GHz and 400THz, falling within the mid-infrared wavelength range. This radiation is not visible to the human eye but can be detected by specialized electronic devices.
2.Q&A: Components of a PIR sensor?
The PIR sensor consists ofan infrared detector(usually made up of thermistors or similar components, used to detect infrared radiation in the surrounding environment),a signal processor(responsible for receiving and processing the electrical signals generated by the infrared detector, including amplification, filtering, comparison, etc.),a trigger(which triggers corresponding actions such as alarms or light control based on the output signal from the signal processor),and a lens(some sensors are equipped with lenses to focus and limit the detection range of the sensor, improving detection accuracy and sensitivity).
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