Author Topic: Basic Motion Activated Circuit  (Read 1947 times)

Offline paintlax21

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Basic Motion Activated Circuit
« on: April 09, 2013, 03:20:41 PM »
I'm trying to figure out what the best compact/basic motion activated circuit would be. I was thinking of using an IR Receiver and IR LED side-by-side and wait for a object to go past it. This circuit would be going in side of a pipe/tube about 1.5" - 2" in diameter

Offline RDC

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Re: Basic Motion Activated Circuit
« Reply #1 on: April 09, 2013, 06:31:27 PM »
Sounds a little like a 'better mouse trap' idear.

It really depends on the type of motion you're trying to detect, as well as what kind of area you need to cover, and then what you intend to do with said input.

A couple of thin metal plates with a shim between one end will work if something steps on it, but it's not going to do anything for water flowing over it.

An IR Emitter and Receiver 'side by side' isn't going to work that great, as it implies they're both facing the same direction. If you're talking about the Emitter on one side or edge of the pipe and the Receiver on the other, then it would work fine.

You may need too debounce or delay that setup also, since it will be fast enough to pick up more than a few pulses in a very short time-frame, so you could end up with far, far more readings than what actually happened, again depending on what motion you're trying to detect. For example, take your hand and pass it between the Emitter and Receiver breaking the beam really fast and you'll get 1 pulse, but if you had you fingers fanned out and passed them thru it, it would count 4 pulses as it goes from being blocked by a finger to open, then blocked again by the next finger then open again and so on. While you only passed you 'hand' thru there once, it's registered 4 pulses, but again, it all depends on what you're trying to detect there.
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Offline paintlax21

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Re: Basic Motion Activated Circuit
« Reply #2 on: April 10, 2013, 01:53:27 PM »
I am trying to detect a ball going through a 2" pipe and when activated it would flip a relay (would only need to be for a short second as if it were a button being pressed). This event will only happen at a 1 ball interval, meaning it wont have multiple balls in a 10 second time frame

Offline RDC

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Re: Basic Motion Activated Circuit
« Reply #3 on: April 10, 2013, 09:04:59 PM »
You could just use a switch, again depending on the specifics such as the weight, speed and diameter of the pipe compared to the ball, but almost any number of methods would work for something like that.

If you want to stay on one side of the pipe, then you could try a Reflective Sensor. That naturally works better the more reflective the surface of the ball is, but if it's close enough it will detect it.
Screwing up is one of the best learning tools, so long as the only thing you're not learning is how to screw up.

 

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