Raspberry Pi Door Sensor (Home Made)

Hello. I would like to make a door sensor that will set off a buzzer when the door is closed. I would like to use aluminum foil and a raspberry pi. I would also like it to be used with a breadboard. Would anyone be willing to help me by telling me which GPIO pin i should connect what to and i am new to python so could someone help me with that please.

Thanks to any suggestions or any piece of info that will help.

Thanks

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0 gadget.iom over 10 years ago

Based on your description so far you don't need a raspberry Pi at all.
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0 Former Member over 10 years ago in reply to gadget.iom

How would I do it then
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0 Former Member over 10 years ago in reply to gadget.iom

How would I do it then
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0 shabaz over 10 years ago in reply to Former Member

gadget.iom is right, a computer (such as the Raspberry Pi) is only needed if you actually want to process the data somehow or do something non-trivial. But your data (at a basic level) is just an on/off signal that you wish to use to control a buzzer according to your description. There is no real processing needed for this - just wire the foil to the buzzer and battery, in other words a series circuit.
It doesn't need a computer.
Based on your question, you probably want to pick up a book on electronic circuits, see this 'Where do i begin' guide from jw0752
If you actually did need to do something non-trivial that requires a Raspberry Pi (but from you question I can't see that you do), then there is a GPIO guide here that should have everything you need.

By the way, I understand this is a home-made sensor so worth experimenting, if you wanted something a bit more reliable for long-term use, check out magnet and reed switch options (e.g. via google).
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0 gadget.iom over 10 years ago in reply to Former Member

Something like this. Replace the switch with your foil contacts.
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0 Former Member over 10 years ago in reply to gadget.iom

Is it possible to use a raspberry pi though as i am trying to learn how to use gpio and python
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0 gadget.iom over 10 years ago in reply to Former Member

That's fine. No problem with using the raspberry pi from an educational point of view. The link that shabaz provided is an excellent starting point.

Keep us posted on your progress.

Paul.
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0 Former Member over 10 years ago in reply to gadget.iom

Just wondering. Would the two pieces of aluminum work like a button. If so would i wire it up like so to the breadboard?

Thanks
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0 gadget.iom over 10 years ago in reply to Former Member

Basically yes.
I did a very similar thing in my younger years. Two pieces of aluminium foil attached side-by-side on the door frame, and a slightly larger strip attached to the door that shorts out the other two pieces.

This will mean that when the door is closed you will have the same situation as holding in the button on shabaz's guide.
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