Does ultra sonic proximity sensor can use as speed detector??

Projects General Guidance
1

I am doing a project,sorry I can't tell that because it's going for petant submission..I have some finally trouble,I nned my ultra sonic proximity sensor to detect spped of object coming,can anyone help me how to build it and give me code??

2

The ultrasonics can only be used for very low speed because the pulses are so slow.

Weedpharma

3

If you can detect the distance to the object, yes. The Arduino can measure time, so it's easy to calculate speed.

For example if you are close enough to a wall to measure distance, you can measure the speed at which you are approaching, or moving away, from the wall.

But, you do need a "big" object and it has to be within range of the sensor. So, that's the big question... Can you measure the distance to the object?

can anyone help me how to build it and give me code??

Nobody is going to write the code for you... You should be able to find examples of code for the distance sensor. You can use the millis() or micros() function to measure elapsed time, and from there you can calculate speed.

Or, if the speed is high enough you may be able to use the [u]Doppler Effect[/u] (measure the change in frequency). Police RADAR uses the Doppler Effect.

4

One of the other potential problems of using ultrasonics to measure speed is the extremely short range, if the target is moving at even moderate speed.

5

AWOL:
One of the other potential problems of using ultrasonics to measure speed is the extremely short range, if the target is moving at even moderate speed.

True but it is more important if the target is moving towards you that it is if it is moving away from you.

sorry I can't tell that because it's going for petant submission

Patents are a total waste of money for an individual unless you are very rich. What happens is the big boys look at patent applications and simply steal what they like. You then have two jobs:-

  1. To find out if they are using your patent in a product - not so easy as this could be hidden.
  2. Sue them for using your patent - they have better lawyers and deeper pockets than you and there are lots of wriggle room in a patent.

I hold two world wide patents, they were taken out by the company I worked for at the time. They paid the lawyers to write the patent application and despite them being my inventions I don't fully understand the patent on one of them.