door

[hvgap]

so i am attempting in my infinite noob knowledge to think of a way for a circuit to turn on when a door is open. I came up with an idea but i would like to see if their is a better, more standard, way to do this. Any help would be appreciated.

 

[ljcox]

You can either use a micro switch or a reed switch mounted in the door frame that is operated by a magnet attached to the door.

For examples, see www.jaycar.com.au and search for catalogue numbers

SM-1002, LA-5070, LA-5072, LA-5074 & LA-5075

 

[hvgap]

haha, i was thinking of a reed switch, but how would that work. I thought that with a reed switch the circuit is activated when the magnet is by the switch. I would want the circuit to turn on when the door is swung open, the magnet is away from the circuit.

 

[kchriste]

You can get both "normally open" type reed switches and the "normally closed" type. Most reed switches for security systems are the "normally closed" type; the switch is ON when the door is closed. You want the opposite which is harder to find but they do exist.

 

[Shax]

You can get both "normally open" type reed switches and the "normally closed" type. Most reed switches for security systems are the "normally closed" type; the switch is ON when the door is closed. You want the opposite which is harder to find but they do exist.

How about using 2 magnets? One mounted on the reedswitch, and one on the door...

[[[[]]]] mag1
--{{{}}}--- reedswitch
___________________ door
[[[[]]]] mag2


Have a play, it does actually work!!!

 

[Dean Huster]

I'd simply use the standard reed switch/magnet assemblies designed for doors and windows and available from a myriad of sources. All the reed switch assemblies for this application that I have provide BOTH N.O. and N.C. contacts. No jerry-rigging necessary.

Dean

 

[hvgap]

**broken link removed** this seems to come with both, would this work for my application?

 

[ljcox]

**broken link removed** this seems to come with both, would this work for my application?

That link did not work. But I have the JayCar paper catalogue.

The LA-5070 has NO and NC contacts.

So you can use the NO side which is what you asked for in your initial post.

 

[hvgap]

ok awesome that was what the link was too. thank you all for the help