A step-by-step guide on how to make coasters light up when you set your drinks down.

What is it?

The Illuminating LED Coaster is a simple and inexpensive way to build your own transparent LED powered coaster. This step-by-step tutorial is designed to help one create his or her own Illuminating LED Coaster using easily available and affordable materials.

How does it work?

The Illuminating Coaster will simply remain off until a beverage is placed upon the coaster. In essence, the coaster acts like a “pressure sensor.”  The weight of the beverage causes pressure to the positive lead of the LED, which in turn, makes contact with the positive side of the 3V lithium battery, illuminating the LEDs inside the coaster.

Step 1: Materials and Tools

In order to successfully create your own coaster, the following items are needed. Each set of materials will be used to build one coaster.

·         Two Acrylic plastic sheets (0.05 inch thickness)
·         Four 3mm LEDs (any color)
·         Two 3V lithium batteries
·         Foam insulation tape
·         Solder

·         *Plastic cutter (acrylic cutter)
·         *Hot glue gun
·         *Soldering iron
·         Pencil
·         Ruler
·         Straight edge
·         Scissors

*Please note to always remember to use appropriate safety equipment including eye protection and gloves when using the plastic cutter, hot glue gun, and soldering iron.
<p>There's no current limiter resistor for the LED. Bad news for the diode. It's nut just enough to match voltage, you also need to limit current so that you don't damage the junction.</p>
<p>I would love to buy one, until I could build one</p>
<p>You do not by any chance sell these to people like me, who broke their arm </p><p>about 5 weeks ago?</p>
<p>This is a cool project. Throw in some UV LEDs to make a beverage flouresce. Like these: https://www.instructables.com/id/TRON-inspired-glow-in-the-dark-drinks/ </p>

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More by Purdue Technical Writing:Create Your Own Illuminating LED Coaster 
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