Siduri – An Arduino Control Smart Coaster

Smart Coaster
Siduri named after the Sumerian god of happiness and merriment, is a smart coaster for your drinks. It recognizes when a glass is near empty and then glows yellow to alert waiters that you will be in need of a refill soon. 

Designed specifically for lounge and club settings, Siduri helps nightlife revelers politely draw the attention of barmaids and helps bartenders to keep the drinks flowing.

The coaster is powered by Ardunio and uses an FSR sensor that recognizes the difference in the weight of a drinking glass. A button located near the base of the coaster allows bar staff to calibrate the coaster to an unlimited amount of drinking glass types into the coaster’s memory. Hidden under the white acrylic top are three surface mount LED’s that breath a soft yellow light when the FSR sensor recognizes when a glass is 3/4 empty. The remaining materials were laser cut out of 1/8” wood to give the coaster a manly, yet classy aged feel.

If you would like to make your own smart coaster, here is how I did it:

Smart Coaster

Step 1: Materials

All electronic components were purchased from Adafruit. The remaining parts were bought from a local art store. Below are the list of materials that you will need to make Siduri. 

1 x Arduino Florabaord
1 x Adafruit Square Force-Sensitive Resistor (FSR)
3 x LED surface mount display RGB pixels
1 x Coin cell battery holder – 6V output with on/off switch
1 x Tactile Button Switch
1 x Resistor 2.7 KOhm

6 x wood
2 x white acrylic
6 x wires
1 x insulating tape
Adhesive backed vinyl

Tools and devices:
1 x laser printer
1 x hot melt glue gun
1 x solder iron

Step 2: Draw and sketch out the parts

I began by drawing out several sketches of what I would need to build the coaster. 

First I created a diagram of how I wanted to house and layer of the electronic parts inside of the coaster. I did this using the below illustrator file. Each of the parts are sized to scale.

Then I created a storyboard outlining step-by-step how I want a user to interact with it. In each instance I discovered that I would have to make adjustments to my original diagram like including a space for a button, a USB port and external access to the battery power. Edit the file for own purposes. Once you feel like you have all the necessary parts, print them out.

*Note: in the final version the FSR sensor is located on the bottom of the coaster and the battery and flora board are housed on the same level

Step 3: Print the Needed Parts and Assemble

I used a band saw to cut out  two 24in X 12in pieces of wood. Once with 1/4in wood and then again with 1/8in wood. I used the thick pieces of wood as the base for each level and the thinner pieces as the middle layers.

Once you have all the pieces, place the corresponding components in their housing. Each part should fit snuggly in their cut outs so that they don’t move. Then layer one of the thin circular cut outs on top of each layer like a cake. You can use a glue gun, wood glue or crazy glue to adhere the rings to each base piece.

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