Wk17: 2016/05/25

The assignments for wk17 were as below;

1. Propose a final project that integrates a range of units covered.
   • Projects can be separate or joint, but need to show individual mastery of all of the skills.
   • Where possible, you should make rather than buy the parts of your project.

Key Questions

This week, we have to propose a final project that integrates the range of units covered, answering the questions below;

1. what will it do?
2. who has done what beforehand?
3. what materials and components will be required?
4. where will they come from?
5. how much will it cost?
   • The answers to the questions above will become your BOM, or Bill Of Materials.
6. what parts and systems will be made?
7. what processes will be used?
8. what tasks need to be completed?
9. what questions need to be answered?
10. what is the schedule?
11. how will it be evaluated?

1) what will it do?

Lost property prevention attachment can let us know by beeping if we leave the property without taking as below. I want the attachment to connect the application of smartphone via bluetooth or iBeacon. The application operate on the background of the smartphone, and beeping if the smartphone gets apart from the attachment to a certain distane (eg. 5m, 10, or so).

Main functions are:

1. Bluetooth connection notifies me before I leave items behind over 30m or so.
2. Accelerometer alerts me when items are closely to be snatched away by thief.

And for final presentation, function 2) is minimum and vital.

2) who's done what beforehand?

I got inspiration from several kickstarter's project as below:

• Track R
• Stick N Find
• REX-SEEK2

Though there are several examples like above, I decicded to make the device for the purpose of improvement for my digital fabrication skill and understand its limit.

3) what materials and components will be required?

With help of Emma, our local instructor, I broke down the project into small tasks/component

Structure of the device

(electrical part)

• Main microcontroller module (equivalent to Arduino: Fabkit)
• Input module: accelerometer board
• Output module: speaker board
• Network module: Bluetooth Law Energy Module
• Battery module

(mechanical(design) part)

• Plastic Case of the device
• Decoration sticker

(programming part)

• software/arduino code

4) where will they come from?

Most materials I used came from the Fablab Amsterdam inventory.
I only bought 9V small battery outside the Fablab.

5) how much will it cost?

Below is the BOM (bill of material) of my final project. It cost 56.5USD totally.

Bill of Material(BOM)

6) what parts and systems will be made?

(electrical part)

• Main microcontroller module (equivalent to Arduino: Fabkit)
• Input module: accelerometer board
• Output module: speaker board
• Network module: Bluetooth Law Energy Module
• Battery module

(mechanical(design) part)

• Plastic Case of the device
• Decoration sticker

(programming part)

• software/arduino code

7) what processes will be used?

(electrical part)

• Main microcontroller module (equivalent to Arduino: Fabkit)
  • Make Fabkit board
• Input module: accelerometer board
  1. Design the schematic and board (EAGLE)
  2. Mill the board by CNC milling machine (Modella)
  3. Solder the components
  4. Embed programming and check function (Arduino)
• Output module: speaker board
  1. Design the schematic and board (EAGLE)
  2. Mill the board by CNC milling machine (Modella)
  3. Solder the components
  4. Embed programming and check function (Arduino)
• Network module: Bluetooth Law Energy Module
• Battery module
  1. Calculate appropriate power supply
  2. Check workability
• Integrate functions above into one device

(mechanical(design) part)

• Plastic Case of the device
  1. Design the plastic frame/case (Fusion360)
  2. 3D print it (3D Printer)
• Decoration sticker
  1. Design sticker (Inkscape)
  2. Cut sticker by vinyl cutter

(programming part)

• software/arduino code
  1. Write the code for each board
  2. Integrate the function of all boards

8) what tasks need to be completed?

Mainly same as Question 7) what processes will be used?

9) what questions need to be answered?

• How to design each schematic/board?
• How much voltage supply is appropriate for the device?
• What is the appropriate setting of the accelerometer?
• Haw can I put all the electrical component into plastic case neatly.
• ...etc

10) what is the schedule?

I have remaining two and a half weeks until final presentation and already made Fabkit board.

So first, I tried to finish the electriacal part; input and output module, and power supply issue. It will take 1-1.5 weeks. After that I will make machanical part; 3D modelling because it is vital part for final presentation, whose process will take 0.5 weeks. Finally, I will tackle networking issue, which will take 1 week or so, however, this is optional for my final presentation.

11) how will it be evaluated?

The system should be able to respond to the motion from others when someone tries to steal the item which the device inside and sound if item holder apart from the device over 30 meter or so.