switch...

[Dana Raymond, a minor God]

What about my suggestion about replacing the magnet with a magnet strip?
You can stick the magnet strip along the travel under the reed switch. The
strip would be cut and placed such that the middle reed switch closes only
where you want it to. I made this suggestion but didn't see anyone bite.

Dana Raymond

"John Fields" <jfields@austininstruments.com> wrote in message
news:mvhnivoncbn7j5ube4cjkfoojt7q4ol7q4@4ax.com...

On 1 Aug 2003 10:16:20 -0700, alec_traun@yahoo.com (alec_traun) wrote:


There is a much simpler way to this. If I understand the problem you
would like to have three indicaters - UP MIDWAY DOWN - for your door.
You already have the UP and DOWN and just need some way of indicating
that the door is somewhere inbetween. Simple connect the ouptuts from
your UP and DOWN switches to a 2-input NOR GATE and the output of the
gate to the MIDWAY indicator.


UP --------------- Up LED
| __
=)__)o----- Midway LED
|
DOWN -------------- Down LED


---
I think you must have misunderstood the OP's requirements:


"The reed switches would be placed on the roller door track, one at the
bottom, one at the midway point and the third one at the top.

the 3 LED represnetation would be: none on =door completely closed, one
light= door partially open, 2 lights= door half open, 3 lights= door
completely open.

As i have said the top and the bottom isn't the problem, I have them
working it is the midway point so forget about the bottom and top.

At the midway point the reed switch is activated momentarily; as the
magnet passes on the roller door ; so this then would turn on a separate
ciruit with the LED..... then when the door closes it is reverse it
would turn the circuit (LED indicating the midway point) off...???"


Clearly this is what he's looking for:

DOOR DIRECTION BOTLED MIDLED TOPLED

FULLY CLOSED OFF OFF OFF

OPENING, < HALFWAY OPEN ON OFF OFF

OPENING, AT MIDPOINT ON ON OFF

FULLY OPEN ON ON ON

CLOSING, < HALFWAY CLOSED ON ON OFF

CLOSING, AT MIDPOINT ON OFF OFF

FULLY CLOSED OFF OFF OFF


and, clearly, your circuit won't satisfy those criteria.

--
John Fields

 

[Dana Raymond, a minor God]

Did I miss something? I think your question implies that there's only one
magnet mounted on the garage door..... I think even a simple diagram would
have helped with this problem. Are there one or two magnets mounted on the
garage door?

OK, without getting too complicated and analytical ;~). How about mounting
the 'middle' reed switch on the rail opposite the one with 'top' and
'bottom' reed switches.

Dana Raymond.

John Fields" <jfields@austininstruments.com> wrote in message
news:nljpivk0u7utf7bd99kjsm97ef00eg4dp6@4ax.com...

On Sun, 03 Aug 2003 04:07:18 GMT, "Dana Raymond, a minor God"
raymonds4@austin.rr.com> wrote:

What about my suggestion about replacing the magnet with a magnet strip?
You can stick the magnet strip along the travel under the reed switch.
The
strip would be cut and placed such that the middle reed switch closes
only
where you want it to. I made this suggestion but didn't see anyone bite.

---
How would you propose cutting and placing the strip so it wouldn't
interfere with the proper operation of the top switch?

--
John Fields