1. Home
  2. Electronic Components
  3. lets start over... device to be build.

lets start over... device to be build.

Ok. to start again. To start with no mercury switches may be used. I am looking to build a box device that has these features:

1.. one switch for turning it on and off 2.. one led to light up when armed 3.. the ability to be armed when placed at any angle without being adjusted in anyway 4.. To sound an alarm upon being moved 5.. the ability to run off a 9V battery

These are the conditions for the device. So far a two axis Accelerometer seems to be the best way to sense the movement of the device. Any ideas?

Reply to
Imp
Loading thread data ...

Don't see any spec for angle accuracy, or if there are limits to the angle it might be placed at, but how about a 2-axis potentiometer-based joystick with a weight on the end?

Do you need to detect movement in all six axes?

Reply to
William P.N. Smith

First the device can not be large.. it can be about 2" - 3" thick and no more then 10"

and it MUST be made from design circuits.... it can not be made of joysticks or other things like that... IT MUST BE A PURE CIRCUIT.

Reply to
Imp

William P.N. Smith wrote in news: snipped-for-privacy@4ax.com:

Got to that one already, but I don't think my comments were entirely appreciated. >:)

You're right though, there is no way we can meaningfully suggest anything, we know nothing of the degree of accuracy required, Hell, we don;t even know if on-off or proportional sensing is required.

What would help is a few sentences describing the context. Like I said, is it a burglar alarm, or a space station gyro? Sure I'm being flippant, but without some prosaic context it;s hard to say anything meaning ful about this. Anyway, I'm tired and in a ratty mood so I'll leave well alone and let others say better stuff than I can do here.

Reply to
Lostgallifreyan

I've got some 2-axis joysticks that are only an inch or so on each side.

What are "design circuits"? If it has to be completely solid state, that (arguably) rules out accellerometers, as they have moving parts. What are you left with, some kind of differential GPS, electric field changes, or a 3D magnetic compass?

You forgot to answer:

Reply to
William P.N. Smith

I missed the original discussion, and took the OP at his word that he wanted to start over.

I agree that we really need to know if this is a homework assignment, a theoretical design, or a product.

Reply to
William P.N. Smith

Does it need the ability to go bang? Use hall effect sensors around a small magnet suspended with springs. Or better yet use coils configured into a pyramid design with a magnet suspended in the middle with springs, when the thing is moved it will generate small signals in the coils that your circuit will detect.

Reply to
James Thompson

"James Thompson" wrote in news:a478$446d7492$438c8711$ snipped-for-privacy@ALLTEL.NET:

Damn good question, should thought of this when the OP was so reticent to answer straught questions. I'm doubly reluctant to contribute to this one now. :)

Reply to
Lostgallifreyan

ElectronDepot website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.