A rather simple project featuring an LED turned on by a tilt switch. I got the idea from seeing similar instructables but i felt like i wanted to make my own improved version. Since valentines was coming up a decided to shape my project like a heart made of plexiglass and have it turn on/off depending on which side of the heart it was leaning towards.
The heart turned out about 6.5x6.5 cm.
What you need:
A computer with CAD and CNC mill (Depending on the shape that you want to make and the material you choose to work with. If you are going to do some really simple shape you can manage without this)
1 Battery (C2032 3V)
1 Red 6mm LED
1 Tilt switch
2 Resistors (16 ohm)
2 M3 Bolts with nuts
2 pieces of 100x100x6 mm plexiglass
(optional) some heat-shrinking tube
This probably cost me around 20$-30$ but i bought enough parts to build at least 30 of them so building one will probably cost you around 5$-10$ since single parts are usually more expensive than packs of them. The two most expensive parts are the switch and the battery.
It does not take much experience but basic soldering skill and basic CAD knowledge will make it a lot easier.
I used http://led.linear1.org/led.wiz
to find out which resistor to use.