Instructables
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)

Tools:
Soldering iron
Sandpaper
Phillips screwdriver

Materials:
1 Battery (C2032 3V)
1 Red 6mm LED
1 Tilt switch
2 Resistors (16 ohm)
   Some wire
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.
 
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Step 1: Shaping your figure

Picture of Shaping your figure
An important step in this project is to plan the layout of your shape. I wanted to make it as small as possible so i bought the components needed and measured them so that i knew how i should place them. At this point it is also a good idea to make a sketch of how you are going to solder your circuit since it will have a large impact on how you have to shape your figure.
MarioNL made it!9 months ago

I made this fully by hand. Cut the pieces of plexiglass with a knife and used sandpaper to do the rest. With some practice the hearts did get better (First one is just awful) Than i drilled holes in 2 layers for the electronics, and used 2 different layers to close everything off. (Plexiglass is 2mm thick)

Its a lot easier with a computer to cut the pieces for you, but this worked out okay.

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Borjesson (author)  MarioNL9 months ago

Impressive! Its great to se that this was possible to do by hand. I see three components, battery, LED and a switch/resistor(?). I actually thought about using 3 layers at first since the plexi I was going to use was thinner than the one I ended up using.

Anyways, fun to see someone else made it I think it turned out great for you!

pigeonpants1 month ago

Quick question- are the wires soldered to the battery, or just held in place against it by the pressure of the two pieces of plexi?

Borjesson (author)  pigeonpants1 month ago

Since it was made by machine i was able to make the grooves just deep enough to simply hold the wire in place with pressure, thus making it replaceable in case it runs out.

Borjesson (author) 9 months ago
Sorry about the spelling, i was fighting autocorrect throughout the entire comment
Borjesson (author) 9 months ago
Great question! There are a couple different approaches is you havent got access to CAD and a CNC mill. Keep in mind that the CNC mill works with greater precision than if you decide to do this by hand.

The first and probably easiest solution would be to use a drill and make several smaller connecting grooves (for the electronics). There are stands that allow you to set how deep into the material the drill should go.

A different solution could be to use a dremel but My exerience usling dremels on plexiglass is that it starts to melt because of the heat so you Will have to be really carelful not to heat the plexi too much (keep that in mind if you are using a drill too).

I hope this answered your question :)
MarioNL9 months ago

What tools could you use to get the grooves for the electronics in the plexiglas?

MarioNL MarioNL9 months ago

(without CAD)