Fabulous Key Finder

Fabulous Key Finder

Cynthia F, Laneasha S-W, Kametria P


The Problem

     You ever lose your keys in the most urgent times? Has that issue ever caused you to run late to school, work, etc? Have you ever had to go make a replacement set of keys, and find your original keys right after? This is a common problem among most americans, and even other cultures that can easily be fixed with the click of a button.


Our Solution

     Our key finder will help you find your keys with a quick push of a button. Once you push the button your keys will light up, and make sound. If you’re in a dark area or looking into or under a dark area, you’ll be able to see it. If you’re in a somewhat noisy room, your keys will have a distinctive sound that will catch your attention instantly. All you need to do is attach our small device to your key ring, and the search is over!


Technology & Modules Utilized

Digital Fabrication: We fabricated more attractive objects that you can attach to your key ring with our key finder device attached to it.

Graphic Design: We’re also using the 3D printer in case you wanted a key chain that was more 3D , rather than a more flat type of keychain.

Physical Programming with arduino: We will use the fio v3 with the xBee radio signal device to have the key chain communicate with the user to locate their missing keys.

Concepts and Design:

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Materials Needed:

  • Fio v3: The Fio v3 is ran on the Arduino Fio hardware.The Fio v3 has an onboard xBee board making it the perfect micro controller for our Key Finder. To program the Fio, we will use line coding in Arduino.52409152757b7f7b188b4569

  • xBee: The xBee that we will be using for our project has a range of about 300 ft, and will act as a transmitter between the button and the Arduino. The xBee relies on radio waves to send signals, and works in two ways, AT and API. In AT mode, the communications go through the xBee while in API mode you interact with the xBee and it sends and receives commands. https://www.youtube.com/watch?v=mPx3TjzvE9U


The Audience / Consumer

In this age of technology, children are being more independent. With smart phones kids are able to walk home alone and check in with their parents via text. The age of people who use house keys are getting younger and younger. However,  kids are more likely to lose their keys. So we created the Fab Key Finder to aid kids as they become more independent in insuring that they will be able to find their keys, even in a messy room.

Update Log / Journal

07/09/14 –

Today we constructed out prototypes. We googled pictures of possible key chain shapes, and bitmapped them on inkscape. From there we transferred them to LibreOffice Draw and printed them to the laser cutter. Because they were prototypes, we print them on cardboard. Today we also programmed an Arduino to make sound, for the sound part of our project. We used mod kit to do this. On mod kit we entered specific commands to do specific things. 

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Today we soldered wires together. First we had to cut the two original ends of the buzzer off and strip their wires. Then we twisted it around the auto jack’s stripped wires. Black meant ground, and Red was negative. We then had to heat up our soldering iron, and grab a piece of wire to clean the tip of the iron. Before we soldered the wires together we had to put on Heat shrink. Heat shrink protects the wires.  We also did more programming

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7/14/14 – Today we researched a possible bluetooth device that we can use on our project. We found this website called adafruit.com and we’re considering use their bluetooth device that they have. Theirs is called the Bluefruit LE-Bluetooth Low Energy (BLE 4.0) – nRF8001 Breakout. We also added more to our prototype. We added walls to the sides of the duplicated prototype, so we can fit the arduino into it.


 7/15/2014 – Today we presented our project to the rest of the group and received some helpful feedback. We also finally got our prototype to light up and make sound with modkit. On modkit we just chose the necessary commands we needed for the light and sound. The pieces fit together like puzzle pieces on the program. 

CAM00330CAM00329  fab key finder 


Sonia – customizable sound,

Naheem- what if the keys were wet? (Waterproof) problen with sound. Different color lights 

Tyla- what if you lose the key ring?

Ahmad- make the sound louder

Xia- Different distances? Higher shriller sound

Websites to consider



Today we updated our materials list. We found that we will need two xBee radio signals , and two Arduinos. We’ll also need a button. We also added the links to the products themselves, and calculated the total. Our total cost will approximately be 130.00. 




Today Kametria, and Laneasha worked with the arduino and breadboard. They got the LED to light up, they just need to start typing up their own personal codes. Cynthia was in the fab lab planning for the final design for our key chain.

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Cynthia used Libra Office Draw to create a press fit box, that will be able to hold the xBee in the final design. While Kametria and Xia worked with the breadboard to make a working circuit. Laneasha with the aid of Kametria was able to begin constructing a final design using Felt, so that it will attract children, our desired audience.


 The following URL will take you to our daily goals sheet, that will show you what goals we set for ourselves at the beginning of the day and whether or not we were able to accomplish our goals.  Fab Daily Log


Kametria uses P2PU online course on Wireless Sensor Networks (https://p2pu.org/en/courses/831/content/2672/) to learn about the xBee.  Kametria was also able to learn how to line code with arduino. While Cynthia learned the uses of xBee and how to program it with the Arduino Fio.








7/23/14 –

Kametria finally got the arduino to light up and make sound with just the button ( although we still need to figure out how to make it work with out the battery,)

Laneasha prototyped a box for the xBee to fit in.


Cynthia finished the online courses

Our problem came to light!

Today our Xbee came! Yayaya Woooot !



Today Kametria attempted to program our arduino.


Cynthia updated the master list


Laneasha updated the Wiki.

 13 August 2014

Susan and Laneasha worked on programming the piezo buzzer to play “Under the Sea” from The Little Mermaid.






Fast & Furious Facts

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