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ACTION
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Type of switch & source
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Picture
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animation if available
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Normally Open
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Regular Push Button (boring) and hard to rig it to turn on with anything
but a finger push |
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Normally Open
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This Motion Detector is made by balancing a very Unstable Weight
on spring. It is surpassingly, VERY Sensitive
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Normally Open
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pendulum is not as sensitive, but easier to build
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Just use it upside down
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Normally Open
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metal contact bar passing springs attached to non metal support.
Use on door or drawer.
Get springs from dead keyboards or cheap ball point pens
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either the spring support or metal bar can slide |
 |
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Normally Open
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mercury tilt switch - a bit of mercury connects wires if it is
tilted one direction, disconnects if tilted the other direction.
Available in old thermostats.
|
 |
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Normally Open
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micro switch - available free from busted mice. New
cost $3 to $4 US.
one connector acts as N.O. and other is N.C.
C refers to common wire, connected to both.
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Normally Open
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coin passing contacts
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