Description
Definition and Working Principle
An ultrasonic sensor uses sound waves above 20 kHz, which are inaudible to humans, to detect objects and measure distances. It consists of two main components: a transmitter, which emits ultrasonic pulses, and a receiver, which detects the reflected echoes. The sensor calculates the distance using the time-of-flight formula: D = 1/2 × T × C, where T is the time taken for the echo to return and C is the speed of sound (343 m/s) in air. This principle is similar to sonar or radar systems
They detect changes in the environment such as heat, sound, or movement. When a change is detected, the sensor sends a signal to a connected system.
1 Ultrasonic Sensor
- Sends out ultrasonic waves and measures their reflection
- Detects movement by changes in sound wave patterns
- Good for large indoor spaces
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