Project Development

Project Development Blog Entry

In this page, I will:

1. Briefly describe my team chemical device

2. Show how the team planned, allocated the tasks, and executed the project.

3. Document the entire design and build process of the chemical device and include videos, pictures, and screen captures of the processes.

4. Include “Hero shot” of every milestone of the processes, example the part A that was 3D printed, part B that was laser-cut, electronics components moved/worked according to the program. Hero-shot is taken with the person-in-charge holding/working/making the parts.

5. Include the name of the person who was in-charge of every part of the project.

6. Document my individual contribution to this project.

7. Provide the link to the page of the blog of my teammates.

8. Describe problems encountered and how the team solved them.

9. Include all the project design files as downloadable files.

10. Embed the final prototype design file, i.e., the final fusion360 design file showing the entire prototype.

11. Type my Learning reflection on the overall project development.








1. Our team Chemical Device

Door Handle Steriliser: Its function is to sterilise the door handle right after someone has just grabbed the door handle to open the door. The body of our device will start at the bottom (resting position) and once the sensor detects the door handle has been touched, after 1 second the LEDs will light up and the stepper motor will rotate the body 180 degrees to the top and then back to the resting position.

Even after the pandemic, covid19 is still rampant and we do not want it to spread in social and crowded places such as offices, hence this is where our product comes in hand as most social interactions usually start off with a handshake and skin contact is the main contributor to the spread of diseases and viruses. Our device will clean the door handle each time it is being used, which prevents any transmission of diseases and viruses.








2. Team Planning, allocation, and execution

CEO: Hai Teng

CFO: Isabella

COO: Ryan

CSO: Fion


Click here to view the finalized BOM (BILL OF MATERIALS) table.

Click here to view the finalized gnatt chart and role allocation



3. Design and Build Process

In this section, I will provide documentation of the design and build process.

Part 1. Design and Build of Main Body (done by Hai Teng and Ryan). Click on the respective names here to view part 1 (Hai Teng), (Ryan)


Part 2. Design and Build of Wooden box, Caution Sign (done by Fion) Click here to view part 2




Part 3. Design and Build of Clamp, Clamp Screw, Thread Connector and Thread Nut (done by Hai Teng). Click here to view part 3


Part 4. Design and Build of Gears and rack, Arm (done by Isabella).



Guide used for design of rack and pinion













From the guide I made a gear using the python gear file in fusion where I then had to trace a single tooth of the gear, making it into a rectangular pattern and adjusting the values to see if it fitted the length of the rectangular rack.



After that I made a crank using the dimensions of the gear hole(2mm dia), using an allowance of .2, it managed to fit into the gear perfectly.

I modelled it vertically and I used offsets to build on top of each object, I filleted the joints so it looked even as well.











Hero shot

Part 5. Design and Build of Door Handle (done by Fion).

Click here to view part 5 Part 6. Programming of motor and LED (done by Isabella).

Arduino Code

Guide used to program stepper

Guide used to program IR sensor



Explanation of code:



^Defining of all of the components going into which pin, and the integers for the sensor and stepper



^Over here is the set up

The numbers of the steps is the pin each terminal goes into, the speed of the motor, and we also declared which pins contained an input and output device.



^The void loop code reads the sensor, once it is sensed it will turn the green led off and the red led on and move the stepper motor up and down.

After that it will turn off the red led and then turn on the green one, and will pause until it senses something again





^this image shows a error i got from the code, which turned out to be nothing more than a missing bracket upon further inspection.)











^Over here is the serial monitor being activated so that I can check the status of the sensor

^ Above here is a rough circuit diagram I made to see how all the components will connect to each other





Images of me wiring the components together



hero shot

Part 7. Integration of all parts and electronics (done by Everyone).



 Video of sterilizer working^

 

4. Problems and solutions

The filament used for the body of our device broke halfway through the print, which caused the print to be incomplete. We found out from the lecturer that the filament we used was faulty, hence for the subsequent 3D prints we used a different printer and made sure the filament used was not faulty

We initially wanted to print the body of our device in one whole, when the print came out we realised that we were not able to install all the components and hide the wires well. To resolve this issue, we printed the body into two halves so that way we will be able to hide the wires easily and all the components would be easy to install.

During the laser cutting process we messed up the dimensions of our box, as it was too small to fit the breadboard and all the other components. The caution sign was too thin so the fit was not very good as it was super loose. We made the necessary changes needed and everything went according to plan.

For the Arduino portion one of the main drawbacks was that the LED light strip was 12V, however the Arduino only carries a maximum of 5V. In order to make up for this we attached the LED to a 12V battery.

Next would be the coding of the LED light, instead of creating a new code for it we instead attached it to the sane circuit the red LED would be in. This is due to how we initially designed it, where when the red LED turns on, the LED strip will start sterilizing. This allowed us to kill two birds with one stone.



5. Project Design Files as downloadable files

In this section, I will provide all the design files (Fusion360 files, .dxf files, .stl files, arduino programs files) as downloadable files.

(upload these files in onedrive or google drive of your personal account. Each person must have these files. Always check that the links to download the files are working.)`

Fusion files (original files for both the STL and DXF as both were designed on fusion)

STL files

DXF files


6. Below is my Learning Reflection on the overall Project Development.

This was a fun project to partake on. I learned a lot about managing a project and how much we needed to collaborate and think together to achieve a common goal. I learnt that dimensions were the most important part before modelling anything, we really need to know the exact measurements lest we end up printing or cutting something that doesn't fit. Wasting a lot of time.

The planning takes more time than the execution. I think this is due to how straightforward everything will seem when you know what to do.

It was very interesting to see the evolution of our design as well. As our final product looks quite different from the one we imagined in our concept A.

It taught me that product design isn't a linear process where it goes from point A to B, but something more fluid where it will go through different routes before coming at its final destination.