Hello! Welcome to My Project Development blog! In this blog, I will be documenting on My team (Kalyani & Friends) and I process o creating a prototype of the BREATHANALYSER.
What is a Breathanalyser?
It is an chemical device that can detect high concentration of alcohol, it alerts the user with a loud beeping noise and flash a red LED. It will also be equipped with a water dispenser to shoot water at the face of those who consumed large amount of alcohol.
What is the objective?
It is to reduce the amount of drunk driving cases by including annoying aspects to the breathanalyser such as the loud alarm and water shooter, people will be more reluctant to be tested drunk and be more cautious on how much alcohol they consumed.
Roles & Task Allocations for the team:
Kalyani: The team leader, Chief Executive Officer (CEO). She is in charge of overseeing the entire process of making the prototype of our chemical device. She makes sure the entire time is on the right track and ensures we meet the deadline for submissions.
Madelaine: Chief Safety Officer (CSO). She ensures that the team safely execute and operates the making of the chemical device. She ensures that there is minimum risk in the making process.
Cui Han: Chief Operating Officer (COO). She is in charge of executing the hands-on operations, she ensures all operations runs smoothly.
Jolyn: Chief Financial Officer (CFO). I am in charge if the finance aspect of this project where I manage the Materials list and gathering of resources.
BOM LIST
Task Allocation TASK | ALLOCATION | DURATION |
3D printed bottle | MADELAINE | 2 hrs |
Laser cutting body | JOLYN | 2 hrs |
Arduino program alcohol sensor,alarm and LED | CUI HAN | 1 DAY |
EXECUTION | KALYANI,CUIHAN,JOLYN,MADELAINE | 1 hr |
DESIGN PROCESS:
Triz Analysis:
To summarize the team’s Triz Analysis:
Engineering Solution | Technical Issue |
Solution: Adding a cushion on the outerwall of the breathanalyzer to cushion the fall in case it is slapped away by the drunk person. Hence, layering cheap materials over each other. | The breathanalyser can break easily when handled recklessly if the user is violent when drunk. The mechanism in the chemical device can be broken easily if it is being protected by weak material |
Solution: Use a material which can withstand high tensile strength to construct the whole device. So that it does not break easily when pushed away. |
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Original Sketch Includes: Cushion layers so that when the bottle falls there will be a cushion to cushion the fall Water tank to hold the water which will be sprayed through the spray nozzle A pushing mechanism to push down the spray nozzle A display screen to display the alcohol level - Fuel cell testers to detect the alcohol molecules
- Programmed board for the programming of the mechanisms
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FINAL DIAGRAM Speaker has been removed as the beep sound can be programmed continuously in the Arduino maker uno. 3D printed a spray bottle instead of actually getting a spray bottle. In this way, we can also control the amount getting splashed. We have also programmed a small light using the Arduino maker uno. Did not include a LCD display, as we wanted to reduce our device complexity. Finally the light and the sound will be programmed using the Arduino maker uno while our water pump is used by using a power source with a switch
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Design Specifications Table:
Chemical product: Breathanalyzer |
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Aspect | Specific Metric(or Quality) | Quantitative value | Description |
Physical | Mass of the product | ≈ 100g | Light |
Water-resistant | - | Acrylic |
Texture of body | - | Smooth |
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Functional | Optimize rate of detecting alcohol | - |
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Consumes low to moderate amount of energy | - |
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Others | Power bank for our switch system | - |
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Part1: Design and Building of water tank (3D Printing)Image of the FINAL PRODUCT:
Part 2: Design and Building of the Breathanalyser Body (Laser Cutting)This part was done by me.
The design process was first thought out on Fusion 360 where we determine the dimensions and measure the different parts of our system to ensure all of it fits into the body. Since we decided to make the body into a cuboid, we just made sure the sides are slightly larger in length and width of our mechanism. I also added some holes of different sizes to fit the cables and our alcohol sensor.
Here is an images of the sketch in Fusion 360:
I then proceeded to extruded the sketch by 3mm as that is about the thickness of the acrylic provided. It then proceed to look something like this:
Once I was satisfied with the 3D Drawing, I then proceed to export this file into an external thumbdrive in dxf format. I then proceeded to turn on the air pump followed by the laser cutter. Then using the thumbdrive, I import the file into CorelDraw and did some touch ups using the software. This is what it looks like in the software.
In this process, a friend of mine who is more experienced in laser cutting gave ma a tip that as long as the line is in hairline format, I do not need to change the colour to red for the laser cutter to detect where to cut.
Once I’m done with making the adjustments on CorelDraw, I then click ‘print’ and it brings me to the Epilogue software. In this software, I can adjust the settings of the laser cutter such as the power, frequency and speed. I remember to always set Autofocus to ‘thickness’ and for this specific laser cutter, we did not require to on ‘air assist’ as there was not setting for that in this laser cutter.
Here is an image of the settings:
For clearer reference, I set the
Speed to 15%, Power to 90% and Frequency to 85%. I then place acrylic sheet and made sure it is in the right placement for the laser to cut. Once it was in the right position, I start the laser cutter to start cutting the material.
Here is what the FINAL Product look like:
In the second picture shows a fail outcome when we wanted to implement joints, I have made the curve too big and this causes the whole cuboid to not be able to be secured properly and align. Hence, we scrapped the joint pieces and just went with the smooth surface pieces as shown in the first picture.
Part 3: Design and Building of the automation system of the alcohol sensor (Arduino Programming)Here is what the FINAL product look like:
Part 4: Integration of all parts and electronics (done by Kalyani)
Here is what the FINAL product looks like:
Problems & Solutions
Key problems | Solution |
The pump we were given did not have a connection that would allow us to connect it to the arduino, so we could not program it. | We operate the water system using a switch. |
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We wanted to use spray bottle for our water, but could not program it so that it sprays when the alcohol is detected. | We 3D printed a hollow cylinder with a hole on the sides so the water shoots out. |
We wanted to 3D print our body, but it took a lot of time. | We laser cut our body , it was easier and more efficient. |
Limitations | Eliminate/ limit |
Arduino boards and maker uno were given by the school, this led to our product to not be as compact as we wanted it to be. | Self-source for smaller arduino boards adn maker uno.
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Pump provided by school was not able to connect to arduino . | We can source for pumps which has the ability to be connected to the arduino uno and it should not be too fragile. |
The beep sound will not stop unless there is certainly no alcohol in the surrounding atmosphere . | |
Google Drive Link for Downloads:
Assemble Body
Full Body Protytype
Water Tank
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