Guest Posted February 13, 2005 Posted February 13, 2005 The problem with the above beam sensor options would be the fact that two people could be going through, one after the other, and the first would leave the 'wet area' trigering the fountain to come on whilst the second person is over the fountain. I would use something that senses when someone is in the exact area which is wet, and turn off the fountain until the 'wet area' is clear, either a well set up PIR, or beam detectors with reflectors zig-zagging the beam across the areas which require ocupancy for the fountains to be turned off.
Guest IM_Alarms Posted February 15, 2005 Posted February 15, 2005 How about an ultrasonic at each end looking in, then programme the system to omit water between the two detected points? Should be safe and unlike any kind of PIR it will not switch off and unlike a beam it isn't looking at such a small point/ area.
secboy Posted February 18, 2005 Posted February 18, 2005 I think this might work but you would need a bit of patience and be willing to sus it out as you went. Everything must be 12v dc for safety and the final control switching gear fitted in IP65 external class plastic box if out side. create a logic circuit using triple pole 12v dc relays mounted on bases it is not simple but if you have the savey and patience you can do it yourself You have to use the relays three contact springs running in series / parallel etc to creat hold offs and latching to achieve what you want. I think it best to use beams as used in shop entrances or automatic gates where you have a transmitter/reciever on one side and a reflector the other it will be cheaper than security beams and you do not need to wire both sides of the path. Where you source the parts is perhapes a problem I would get them from RS componants as I have an account but perhapes you could try maplins/elec whole sale? I would suggest you build a prototype box which will allow you to easily change things untill correct and can be constructed as permanent.you can build in as many anti soaking circuits as you like it will only be limited by your ability and immagination hope this is usefull please see attachment if i have managed to post it ??? regards Paul. fountain_control.bmp
secboy Posted February 18, 2005 Posted February 18, 2005 Your point is noted. All I can say is that know about the fountain end of the task and while having a rudimentary knowledge of automation I would like to know I have looked at all option available. I'm certainly not trying to take work away from the professionals in security. 40184[/snapback] This is not so simple I'll have a think about it!! Paul.
amateurandy Posted February 18, 2005 Posted February 18, 2005 For what it's worth I asked one of my neighbours, who is a specialist electronics design engineer, about this. He currently does instruments and sensors (e.g. gases) but has worked on most things. His view was that IR beams and a bespoke controller would do the job, but added that reliably detecting people in all their shapes sizes etc. is darn difficult!
Guest Guest Posted February 18, 2005 Posted February 18, 2005 For what it's worth I asked one of my neighbours, who is a specialist electronics design engineer, about this. He currently does instruments and sensors (e.g. gases) but has worked on most things.His view was that IR beams and a bespoke controller would do the job, but added that reliably detecting people in all their shapes sizes etc. is darn difficult! 40978[/snapback] Electronics is hip but I cut my teeth on relays give me a box of them and I can control most things, plus any one with a logical approach/basic electrical skills patience and time can do nearly any type of control the two basics are triple pole relays and how to make a relay latch then drop out when instructed! once the control is sorted it will need fine tuning of the beam positions to achieve the best result ,problem with "bespoke" is the one off design and build cost of a third party! Paul.
Guest Guest Posted February 21, 2005 Posted February 21, 2005 Electronics is hip but I cut my teeth on relays give me a box of them and I can control most things, plus any one with a logical approach/basic electrical skills patience and time can do nearly any type of control the two basics are triple pole relays and how to make a relay latch then drop out when instructed! once the control is sorted it will need fine tuning of the beam positions to achieve the best result ,problem with "bespoke" is the one off design and build cost of a third party! Paul. 40979[/snapback] If you can find someone local at all prepared or able to do it!!
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