So I'm currently working on my high school final project, which is basically a Radar :) ...
I'm using the SRF05 detector to detect objects that are near the surface of the device. My current assignment is to learn and summarize all the different components that will be assembled at the end. (UART, MAX232 74HC244 etc, if you want to know :)
My teacher told me that the more I will know about these components, the better I will do at my work, and in the exams. So here is my question: Why sound waves are the best choice for the SRF05? Furthermore, why UltraSonic ones? What are the benefits of using sound waves, but not invisible light waves, heat or any other means that can do the job? Light, for example, travel much faster, thus creates a better result and will probably be more effective than sound.
Answer
Basically, sound is slow.
Using sound you can easily time how long a wave takes to travel to your object and reflect off it, thus giving you a fairly accurate distance. Light goes too fast for that, unless you are looking to measure the distance of the moon, say.
And why ultrasonic? So you can't year it. Imagine how annoying it would be if you were forced to hear it all the time? BeeeEEEeeeEEEEeeeEEEEEEEeeeeeeEEE....eeEEEeeEEEP
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