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Jerry
Joined: 22 Sep 2006
Posts: 14
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 Posted:
Wed Oct 25, 2006 7:45 pm Post subject:
unusual Circuit Diagram wanted |
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Hi Guys
I don't know if anyone can help me with this one, But I need a circuit diagram that when a sensor is moved say within 6-8'' of a window it will activate a relay,
I was thinking may-be a car reversing sensor might work, but the distance on these are to great, there in the range of 1.5 meters and I only need a distance of 6-8 inches and up to a voltage range of 12v. any help from the experts will be fantastic.
Thanks Guy's
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neon
Joined: 25 Feb 2006
Posts: 585
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Thu Oct 26, 2006 9:18 pm Post subject:
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| a photocell can do that calibrating and sensitivity maybe tricky. |
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Jerry
Joined: 22 Sep 2006
Posts: 14
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Mon Oct 30, 2006 4:22 pm Post subject:
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But wouldn't a photocell be tricky altogether under different ambient conditions? if not would it be possible to add a variable resistor to adjust its sensetivity when needed?
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neon
Joined: 25 Feb 2006
Posts: 585
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Wed Nov 01, 2006 12:21 am Post subject:
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| Magnetics are more definite however the sensitivity will change as the square of the distance. Make the photocell detect withing a window of operation. |
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Jerry
Joined: 22 Sep 2006
Posts: 14
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Fri Nov 03, 2006 8:30 pm Post subject:
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Ah! Thanks neon
But I feel I did not explane myself properly in my original thread, when I said a window, I actually meant a window (glass) this is the reason for my first reply about the ambient light conditions, Hope you can still help
Kind regards
Jeff. |
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neon
Joined: 25 Feb 2006
Posts: 585
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Sat Nov 04, 2006 4:15 am Post subject:
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| photocell will stil work acualy you can buy for $20 and modefy it to your liking. IT will probably say motion detector but it is a photocell. even a simple garden lamp would work if you bock the light but still must be modified for your application. |
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Jerry
Joined: 22 Sep 2006
Posts: 14
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Sun Nov 05, 2006 10:49 am Post subject:
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Thanks for your help Neon
I'll give it a try and let you know. |
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neon
Joined: 25 Feb 2006
Posts: 585
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Sun Jan 28, 2007 8:04 pm Post subject:
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| NO RESPONSE |
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Jerry
Joined: 22 Sep 2006
Posts: 14
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Wed Feb 14, 2007 5:37 pm Post subject:
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| sorry I never got around to it, so still on the drawing boared. |
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