PROJECT DEVELOPMENT

My group's chemical device "The Breather" 🍻, 

We chose to work on a breath analyzer, due the problem we faced recently, in the increase of drink driving which leads to accidents and deaths. Thus, our chemical device is to remind the drunk driver that he/she should not drive. Thus, will reduce the number of drunk driving incidents from happening.

Thus, at the very start of our product ideation design, we drew a sketch with our own knowledge on how a breath analyzer looks like. So we did the first sketch and a final sketch. The sketches are as shown below:

Figure 1: Original Sketch

Figure 2: Final sketch

How my team planned, allocated tasks, and build the chemical device?

Figure 3: Finalized BOM

Figure 4: Finalized Ghatt's Chart

Task allocation: 

Design and Build Process:

Andrew was in-charge of the designing the product and doing CAD for each of the parts needed. 

Figure 5: Tank 

Figure 6: Tank Cover

Figure 7: Breath analyzer stand/holder

Figure8: Tank for stand on head rest on car seat

Project Development Blog: 

https://cp5070-2021-2b03-group2-andrew.blogspot.com/p/project-development.html 

Junheng was tasked to d 3D printing and laser cutting of the prototype.

Project Development Blog: 

https://cp5070-2021-2b03-group2-jun.blogspot.com/p/project-development.html

Piti was in-charge of the Arduino programming where she had to do a combined coding of the gas sensor, LED light and the alarm (tone melody).

Project Development Blog: 

https://cp5070-2021-2b03-group2-piti.blogspot.com/p/project-development.html 

Arduino code: Link

Video of the end product: Circuit Video Link 

While I was in-charge of assembling the different parts together to make the different parts of the prototype into 1. I was also in-charge of the slides for the presentation.

I then brought home everything that was prepared by the other team members and assemble all the items together to form our prototype. 

I also added a cardboard piece into the tank, acting as a slide, so that the pebble (substitution for water) would slide down immediately when the door of the tank was open.

Prototype Testing: Video Link

Problems and solutions:

1. Arduino Programming Problem:

• Connection between sensor and servo 
• Combining all functions together

To solve this problem, we took reference from an ultrasound sensor circuit. and Thus was able to connect the sensor to the arduino maker uno successfully.

2. 3D-Printing Problem: 

• Dimensions error

This part of the 3D-Printing was caused by the CAD design whereby the design was too thin to be printed and everything started to fall apart. Thus, to solve this problem, Andrew had to increase the thickness of the tank and make changes to the dimensions for the other parts of the prototype so the same thing does not repeat itself, as it wasted resources and time.

The attached is the before and after of our tank which was printed first as it was the main component for our chemical device.