Picture of How to make a lie detector (sort of)
This is a machine that could be loads of things. It's basicly a machine that buzzes each time you press a secret switch but it DOES look cool! you can decorate it too to make it look MORE cool! Happy buzzing!

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Step 1: You Will Need:


1x wooden square (base)
1x long thick copper wire with no insulation on (finger holder)
4x long thin copper wire with insulation
1x buzzer (12 volt)
1x 9 volt battery
2x paperclips
2x copper nails
2x short screws (length shorter than depth of base)
duck tape
1x elastic band (or thin string)

Tools and bits:

wire stripper
soldering iron
saw (if you need to cut the wood)
double sided sticky pads
about finger size tube

Step 2: Make and put on the finger holder

Picture of make and put on the finger holder
get the thick copper wire and wrap it round the about finger sized tube.
take the tube out and bend the ends of the wire into tiny little circles and use the screwdriver to screw the two short screws in to them so the finger holder will be in place.

Step 3: Glue and make the hidden switch

Picture of glue and make the hidden switch
get the two paper clips and bend the outside of one up a little.
mix the two araldites together to make an araldite glue. spread it on the back of the wooden board nd put in the un-bent paperclip in first. then put in the bent paperclip so the upper bit of it is over the un-bent paperclip but they must not touch.

Step 4: Put on the other parts (except the four wires)

Picture of put on the other parts (except the four wires)
first put on the copper nails by hammering them in with the hammer.
then put on the battery and the buzzer by using the double sided sticky pads to stick on the back of them, then peel off the covers and stick them on the wooden board.
paradad (author) 6 years ago
thanks, guys. I don't know about you but I think the microcontroler is a good idea. how about sticking it on your door so it looks like one of those access to your door things? Ben (age 9)
Berserk876 years ago
you need to solder a microcontroller in there somewhere. dosnt have to do anything, but it makes your "lie detector" look more believable.
hg3416 years ago
wow thats real funny