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Vibration Sensor Matrix.

Hello,

I have total Newboid status so sorry if any of the following doesn't make sense.

I am trying to wire a wooden wall with vibration sensors to detect whereabouts a thrown ball hits it.

I have some piezos which give out a variable voltage when vibrated.

I have a BX-24 microcontroller which takes voltage up to 5V, current up to 100 milliamps.

I have 2 questions.

  1. How do I build a circuit to convert the piezo output into a safe readable format for the microcontroller?

  1. If I build a matrix of say 12 piezos and analyse the results in software to estimate the position of impact (on the wall) how accurate results could I expect?

Thanks for any guidance,

Gav

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Reply to
gavspav
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This has already been done for electronic dart boards; one of which I have reprogrammed with random animal grunts along with voice output of your score.

It uses a large membrane switch. Each plastic 'segment' of the target floats on 3 or four plastic feet that rest on individual switches. A dart hitting the plastic causes a minimum 1 millisecond pulse, easily read by a micro controller.

--
Luhan Monat: luhanis(at)yahoo(dot)com
http://members.cox.net/berniekm
"Any sufficiently advanced magick is
indistinguishable from technology."
Reply to
Luhan Monat

Thanks for the tip. I'm not sure how durable membrane switches would be in the face of travelling balls?

I am making a kind of 'virtual cocount shy' where you aim at projected objects/people.

I love the dartboard hack! Couldn't find it on your site though.

Gav

Luhan M>

Reply to
gavspav

Thanks, there's a lot thats not on my site. I'll get around to most of it someday.

Good luck,

--
Luhan Monat: luhanis(at)yahoo(dot)com
http://members.cox.net/berniekm
"Any sufficiently advanced magick is
indistinguishable from technology."
Reply to
Luhan Monat

I'm not sure that piezo amplitude is going to be a repeatable or calibrateable input - also aren't piezo sensors susceptible to damage from physical shock?

If the panel was of a uniform material, you might gate the lossely-coupled sensor array's rising edges to a ~MHz oscillator and calculate a point of impact. Perhaps an fpga could most easily do the real-time clocking. A slower microcontroller might read and reset the count, handling the display and other housekeeping functions.

RL

Reply to
legg

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