Download DIY Switch Lab PDF - http://jasonkrugman.com/classes/physcomp/switchLab/DIY_Switch_Lab.pdf
An Industrial Tilt Switch Diagram (Below) - all the the contacts are gold plated because gold conducts well and does not oxidize over time.
Hackaday DIY Mat Switch (Below)- A switch to detect when someone steps on it using household materials.
Tutorial Link Here - http://hackaday.com/2013/10/02/diy-pressure-plate-switch-for-your-haunted-house/
