Introduction: Pressure Switch Alarm

Picture of Pressure Switch Alarm

This instructable will show you how to make an awsome pressure switch alarm. I spent about 10$! warning it is loud

Step 1: Getting the Parts.

Picture of Getting the Parts.

What you need for this project is:
1. soldering iron
2. solder
3. soldering skills
4. 12v siren
5. 9v battery clip
6. 150 ohm resistor resistor ,color(brown,green,brown,gold)
7. 3 pin pressure switch
8. on/off switch
9. 9v battery
10. wire
11. 12v DC relay (I got mine from an old Phillips computer monitor)
12. The moment of truth lie detector (Don't worry its fake).
13. a box to put it in.

Step 2: Hack the Lie Detector

Picture of Hack the Lie Detector

First you need to take apart the "Fake" lie detector.
look at picture for detales.

Step 3: Connect It All

Picture of Connect It All

see pictuers for details.

Step 4: Finished Product

Picture of Finished Product

sorry this is mt first instructable


admin (author)2008-12-01

This is a great Instructable, but you need to add a main image of the final project to the intro step. Please do that and leave me a message when you have so that we can publish your work. Thanks!

coggie (author)2009-01-08

its cool but the diagram is a bit confussing!!!!!!!!

godfreyandthandi (author)coggie2009-07-19


agis68 (author)2008-12-11

Nice idea but please give us a pcb schedule or at least a very detail side of the circuit. Maybe its only me but I can't understand the circuit...Where u put the resistor? please help me

BBru62 (author)agis682008-12-25

you put the resistor on the positive end of the leds

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