Project Development Blog Entry

Hello everyone, welcome back to my blog! Unfortunately, this will be my last blog for the semester so let's end it off on a high note. This blog entry will be about my Project development for my group's breathalyzer.

List of Contents:

1. Brief description of my team's 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. A “Hero shot” of every milestone of the processes, 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. Links to the pages of the blog of my teammates.

8. A brief rundown of problems encountered and how the team solved them.

9. All 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. My Learning reflection on the overall project development.

1. Our team's Chemical Device

• In this section, I will briefly describe my team's chemical device.

My team's chemical device is a breathalyzer that will be placed on the car dash. It is a rectangle box of 17cm by 16.5cm by 4cm holding an Arduino board, breadboard, LCD screen, MQ3 Alcohol Sensor, Servo Motor, and a switch. It has a 3D printed platform that is supported by 3 beams to prop up the LCD Screen and the MQ3 Alcohol Sensor.

• What it is. What problems will the chemical device solve?

It will be used in all motor vehicles that are operated with steering wheels, the breathalyzer

will be able to detect the alcohol concentration of the driver's breath. If the alcohol concentration is above a certain threshold, the car will remain in the locked position and prevent drunk driving. However, if the alcohol concentration is below the threshold, the car's engine will start running and will be able to be driven.

• Below is the hand sketch of the chemical device.

2. Team Planning, allocation, and execution

• In this section, I will list down my team member's name and their respective roles (CEO, CFO, COO, CSO)

CEO: Jing Yang

CFO: Wei Ling

COO: Kallyssa

CSO: Ethan

• Here is the finalized BOM (BILL OF MATERIALS) table. (BOM Link: BOM)

• I will show the finalized Gantt chart (planned and actual) and the allocated tasks for each team member. (Gantt Chart Link: Gantt Chart)

I was in charge of the creation of the container, cover, platform, Mouthpiece, and LCD prop.

Kallysa was in charge of the creation of the Steering wheel and lock mechanism pieces.

Wei Ling and Jing Yang were responsible for the Arduino coding of the LCD Screen, MQ3 alcohol sensor, LED lights, button, and servo motor.

3. Design and Build Process In this section, I will provide documentation of the design and build process.

Part 1. Design of the cardboard prototype (Done by Kallysa and me)

We made prototypes of the container with cardboard and tape, however, to make the design specific and perfectly designed to hold all our components I took measurements for all our components and sketched out the new design and format on the big piece of cardboard for fusion 360 3D modeling.

Part 2. Design of the Lower Container, Upper Cover, Platform, Mouthpiece, and LCD Screen Prop

Step 1: First, Transfer the sketched design on the cardboard to Fusion 360.

The design of the final container was to be 15.5cm by 17cm by 4cm

Step 2: Create the borders of the container

All the sides have a thickness of 0.5cm

Step 3: Extrude all the pieces and combine them into one body

Step 4: Implement holes in the sides for the platform hinges to be made

The holes have dimensions of 1.5cm by 0.5cm

Step 5: Extrude the platform hinges to create a body for the platform hinges

The 2 platforms are both 17cm long with a 1.5cm by 0.5cm frame

Create a hole for the platform hinge to allow wires to come through

Step 6: Create a platform to fit within the hinges along with a mouthpiece and a prop for the LCD screen.

Sketch a piece that can fit in the hinges with a little buffer space. (+0.1cm)

Extrude and hole a little hole on the body for wires to come out

Step 7: Create a sketch of the mouthpiece and LCD screen prop

The Square plot is 1.5cm by 1.5cm with a height of 1.25cm

The cylindrical mouthpiece has an inner diameter of 1.7cm and an outer diameter of 2.5cm

Step 8: Save all files as their respective file types

Step 9: 3D Print the platform, mouthpiece, and LCD prop

Here is a close-up of our 3D print in progress:

Step 10: Laser Cut the pieces for the container

Here are the fusion 360 Files of the Container, Platform, mouthpiece, and LCD screen prop.

Here is the hero shot of the 3D-printed platform:

Here is the hero shot of the Acrylic container:

Part 3. Design of steering wheel and lock and gear mechanism(Done by Kallysa).

https://cp5070-2022-2b03-group3-kallysa.blogspot.com/p/home.html

Part 4. Coding of Servo Motor, Buzzer, and LED lights (Done by Wei Ling).

https://cp5070-2022-2b03-group3-yak-wei-ling.blogspot.com/p/project-development.html

Part 5. Programming of MQ3 Sensor, LCD Screen, and Integration of all codes (Done by Jing Yang).

https://cp5070-2022-2b03-group3-tjingyang.blogspot.com/p/project-development.html

Part 6. Assembly (Done by everyone)

We had to acrylic glue the acrylic pieces together, wait for them to dry, and then assemble all our inner components for troubleshooting.

4. Problems and solutions In this section, I will describe the problems encountered in the design and build process and how the team solved them. Problem 1: No place for wires to go

Initially, the platform would have been a normal rectangle piece to be placed on the hinges to support the LCD screen and alcohol sensor however, we realized that the wires of said LCD screen and alcohol sensor were too long and messy making the placement of the LCD screen and alcohol sensor difficult as the wires would take too much space.

To combat this setback, we came up with an idea to have a hole in the platform where it wasn't supporting anything to allow the wires to flow out and it would also keep them tidy

Problem 2: The container frame is too big

The container I had designed had proven to be too big for the 3D printer, to combat this issue I decreased the length of the container while allowing the breadth to stay the same. Initially, my dimensions were 17cm by 17cm by 4cm however I changed the breadth from 17cm to 15.5cm to fit in the dimensions. However, in the end, I decided not to use 3D printing for the main container as it would take very long, and instead use laser cutting.

Problem 3: The container has no cover

This was a very grave mistake as It had slipped my mind that we had no way of covering the container as it only had a top and sides. However, after brainstorming the group decided to use the current sides (17cm by 15.5cm) for the container while the face will be paired with a new group of sides whose dimensions are 18cm by 16.5cm, we also laser cut a bottom piece to be paired with the old sides. The bottom piece and old sides will make up the bottom container while the face and the new sides will make up the upper cover. Combining the bigger upper cover with the bottom container will keep all the pieces in place and the result will be a breathalyzer with no loose parts.

Problem 4: The Switch cannot be connected

Jing yang acquired a switch for us to use as a button, however, we didn't realize that it came with a downside. It couldn't be connected, it had to be soldered on as It was not an Arduino piece. After this information had come to my knowledge, I quickly brushed up on my soldering skills and headed to Makerspace to solder the pieces.

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

https://drive.google.com/drive/folders/18B0dFPW7tG4uGtQFwbtgfEqaOj3QhsdS

6. Below is my Learning Reflection on the overall Project Development. All in all, this was our biggest project to date and It took our combined effort for our team to work together and bring our A game. We had to apply much of what we used in our previous chapters like Arduino coding, laser cutting, 3D printing, cardboard prototyping, and much more. We had to communicate well to update each other on our progress throughout the whole journey of the creation of our product. Although we did run into our own respective issues with each of our responsibilities, we managed to overcome our problems by coming together and coming up with a compromised solution to resolve the problem. I feel that I've put in a lot of effort during my part in the product creation and that I think we have done a good job in terms of our effort toward getting quality work done. I think my groupmates have also done a good job on their own parts and I feel that we worked together well to complete the project.

At the end of the day, this was a very good way of summarising all that we have learned during this module and it really tested our proficiency in the skills we have learned. I know that the skills I have learned and practiced in this module will surely be of use in our final year project and in the future to come.

This is the final product:

Here is how our product works when you're drunk:

Here is how it works if you're sober:

Here is our integrated fusion file: