How to build a simple PIR sports sensor

　　The schematic diagram shows how to build a simple PIR movement sensor. The PIR sensor allows motion sensing, which is almost always used to detect whether someone enters or leaves the sensor range. They have low power consumption, easy to use, small volume, low price and not wear. For these reasons, they are usually found in small tools used in family, enterprises and home appliances. PIR is usually called "passive infrared", "IR movement" or "thermal power" sensor. It is basically made by thermal -release sensor: a circular metal tank with rectangular crystals in the center can detect infrared radiation levels. Everything exudes low -level radiation, and as the object becomes hot, it also emits more radiation. In fact, the sensors in the motion detector are divided into two halves, because we want to detect motion (change) rather than the average IR level. Connect two halves to offset each other. If one person sees more or less IR radiation than another, the output will be high or lower.

　　A series of support circuits, resistors and capacitors are used with thermal release sensor. Most small enthusiasts use BISS0001 ("Micro -Power PIR Motor IC") as sensors, which is a very cheap chip. The chip receives the output of the sensor and processes it for some small processing to emit digital pulse as the output of analog sensor.

　　The PIR sensor is very suitable for many projects or products that need to be left to enter or enter the area. They have low power consumption, low cost, sturdy and durable, extensive and easy to interface. Please note that PIR will not tell you how many people around you, or how close them to the sensor, the lens is usually fixed in a certain scanning range and distance, although it can be cut somewhere, sometimes it can be taken away by pets. Essence

　　The following circuit shows the PIR motion detector circuit. This circuit is based on HT2810 IC, with passive infrared sensor (PIR), DC 5V voltage, 9 volt sound generator circuit. Components: For example, IC, resistor, speaker, diode, capacitors, transistors and switches.

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