Motion Detector Circuit


Posted on Feb 6, 2014

This is a circuit which can detect any motion or movement. It`s most common use is to detect a person moving through an area where the motion detector can sense. The main electronic component we will use that allows us to pick up this detection is the PIR motion sensor. The PIR motion sensor is a sensor which detects movement through picking up in


Motion Detector Circuit
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frared waves. Being that a person emits infrared waves, the detector is able to detect these waves and react, according to the how the circuit is designed to react. The sensor can also pick up the movement of inanimate objects as well, such a rolling ball, because as those objects move, friction acts on them, generating heat. This heat emits infrared radiation, which the PIR sensors may be able to detect if great enough. The PIR motion sensor is, again, a sensor which can detect movement through picking up infrared radiation. Being that people naturally give off radiation, because of our generated body heat, the motion can easily detect people walking and moving through a vicinity within the sensor`s range. The motion sensor has a sensitivity range up to 20 feet (6 meters) and a 110G‚ ° x 70G‚ ° detection range, making it a wide lens detection sensor. This means it can measure 110G‚ ° vertically (from top to bottom) and 70G‚ ° horizontally (from left to right). The best way to check its sensitivity is when the circuit is built, try moving around through all of its angles. See at which angles it can detect your movement and at which angles it is not able to detect your movement, meaning your out of its angle scope. A lot of it is trial and error and experimenting. Once you know where it can and cannot detect, you can place it in an optimal place where it can detect in areas where you want it to. Pin 1 is the pin which...




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