The relay use to trigger another circuit when there is movement detects. The signal generate by the sensor is about ±40khz. This is a fully hardware design project plus it is built to be a portable ultrasonic motion detector.

... Electronic's motion detector (right) is an unobtrusive box. You can set it to trigger its own built-in alarm, or you can connect your own alarm to the interior relay. The front of the case has a round cutout for the lens atop the integrated ...

... sensing errors it may make , and reset itself accordingly . Obviously , I need a doorway sensor that will detect people passing through , and also detect the direction they are going . Would you suggest ultrasonic sen- sors , or would ...

... kit that includes a timing light, compression tester and electronic box that lets you check everything from simple timing to more elaborate electronics ... motion detector, which is activated by the garage door being opened. This is also ...

... Ultrasonic with PIR The sensor shown in Figure 19.1 is from the Aritech Type DD 325/335 series PIR detector combined with an ultrasonic Doppler detector . Both systems must detect motion ... set off . The PIR sensor has its own anti ...

... motion detectors, we take a moment here to give you the lowdown on a couple of other types: ✓ Active infrared motion sensor: This sensor uses an LED that emits infrared light and a detector ... Ultrasonic motion detector: This detector ...

... detectors. Ultrasonic Motion Detector Motion of material objects in a small to moderate-sized space causes changes in the relative phases of acoustic waves that reflect from the objects. An ultrasonic motion detector employs a set of ...