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Macgyver BR

Sense special

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I elaborate a device of trap for fish, that should liberate the size agreement with roads of the fish. Do not I be sure, which kind of sensor adapted, for this. I imagined, mount reels of wire, in pipes of PVC, and when the fish pass in the field the frequency, will have a disturbe. And each reel, a peculiar frequency for not have interference. Which industrial modules, they can do the reading of this sign? I imagine, a sensor exists, to what did I relate. Which the name tecnique? Recommendations, kind of sensor, manufacturer? What types? That they can do this work. Detail, the fish swim inside the pipe. First in some of river, afterwards be operated well, will be with salt water.

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How do you indend to bring fish into the pipe? With some bait? Why not use limit switch triggered by pull on the bait? I think it's much simpler to use and probably more reliable...

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Panic Mode: I have you ever been to Portland Oregon? There is the Bonneville Lock and Dam there. At the dam, they have a fish counter behind glass. I guess there is a small passage at the dam they funnel all the fish through and they use a Vision System to ID the fish and count them as they go by https://www.nwp.usace.army.mil/op/b/ They collect data on Fish, check out the fish counts on the web: https://www.nwp.usace.army.mil/op/fishdata/welcome.htm Here is an example report: http://www.nwd-wc.usace.army.mil/ftppub/fi...fish_report.txt A quick search on google shows these results: http://www.smith-root.com/products/counters/ Check out the sensor tube. I think the vision system I saw there looked something like this system: http://www.fishways.freeserve.co.uk/vaki_r..._riverwatch.htm Anyway....interesting info...

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Never been in Protland but I'll try to remember to visit the dam if I ever get there (sounds interesting). Requirement was not quite clear except that it needed to be portable enough to be easily moved from fresh to salt waters. Using clear pipe and optical sensors is probably the easiest approach but I couldn't tell if the unit could be transparent. Besides waterproofing limit sw is much simpler and easier to check for functionality on something that possibly can be mounted on an end of stick that is manually lowered into water.

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Interesting I liked the links, still I exploit. Tranks It is near than I try carry out. The product of count fish, is interesting, and the scanner underwater with silhouette and reflexive marks of the fish. The stuff, is last but I cannot elevate the cost it select a scanner. The fish are of skin of leather and some of scales, the water is soils, tone varies. Do not I be sure sensor of light, work well.. There is absolute certainty of utilize magnetic sensor of field, became doubtful, some sort is the environment of guide, scares away. (But a fish in a pipe cannot come back backwards) The question: Which the half adequate one and stable, for measure the fish inside the pipe, with water of tone variable? Light, magnetic, rays, sound,.. Obs: Tube plastic, opaque or transparent. I help me find I help me find

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Soon it will complete a month. And did not I uncover, which half adapted of measure a fish. ... Nobody, has idea? Which element sensor appropriated.. Already verify, the scanner of the link indicated. However inviavél, cost elevated. Difficulties... has some forum specific in sensors? Tranks replys

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This is quite unusual application so you will be on your own. I would probably get fishtank (and a frying pan) to experiment to find what would work best. Maybe capacitive proxy? I'm not sure if this is available in analog version (there are inductive proxies with analog out, but capacitive...?).

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just a thought, probably an ultrasonic sensor?

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Can't help with any links but perhaps a passive infra-red sensor. These are not really used much (to my knowledge) in industrial but are the standard in the security industry as motion sensors. If someone makes a similar sensor but targeted to general sensing it might fit the bill.

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