Very Short Range Detection

Projects General Guidance
1

Hello.

I need something that can detect when it is close to something else, over a range of at least 6 inches away and not more than 12 inches.

EG,

If it detects when it is further than 12 inches, that no good.
It needs to be able to detect from a distance of at least 6 inches away.

So the range of detection would be fine from 0-12 inches, but the objects would never get closer than 6 inches (so, for instance, hall effect sensors wouldn't work)

Also, optical is not an option either because there will be obstructions in the way.

Also, id like to keep the project small, so something smaller than a deck of cards. I saw the NFC readers but they look a little...

Ideas?

2

This is for a ghost-busters show,right?

Paul

3

nope.

I want to put a device on my remote that will sense when a dogs collar is next to it. He keeps chewing my remote and my remote costs 300 dollars to replace. Thus far i’ve spend 900 on remotes this year. I could put the remote up, but come on now.

4

Qdeathstar:
nope.

I want to put a device on my remote that will sense when a dogs collar is next to it. He keeps chewing my remote and my remote costs 300 dollars to replace. Thus far i’ve spend 900 on remotes this year. I could put the remote up, but come on now.

Should it detect "any" dog collar? Or a specific dog collar?
what is this dog collar made of? A coil of wire might be detected.

Paul

5

i can put whatever needs to be put on the dog collar, so long as it and it’s battery isn’t huge. In the end i would like to enterface wth a shock collar.

6

One of these, maybe ?

...R

7

come on robin, this ain’t barsport.. :wink:

8

Agreed. But I was trying to make the point that I think you are tackling the problem from the wrong end.

...R

9

From experience, shock collar is very effective.

10

Proper solution: don't leave your fancy remote in a place where the dog can get to it.

Technical solution: strong magnet on dog's collar; hall effect sensor at the remote. Let alarm go off when a magnet is detected. Now all that's left is to attach this alarm system to your remote (making it much more bulky - of course you'd HAVE to attach the two together or it would become an equivalent of the "proper solution"), and make sure the batteries of the alarm system don't run out.

11

Ultrasound?
Dog collar send a ping every X seconds. When remote hears ping it responds with own ping. Collar can compute distance and act if it is too close.
But I think it is unfair to the dog to be shocked when it goes innocently around a table with your remote. Maybe some other detector would work better? I.e. when surface conductance increases (due to dog's saliva) it means dog is chewing and should be punished.

12

Another solution: make that remote taste bad.