In this page, I will:
Briefly describe my team chemical device
Show how the team planned, allocated the tasks, and executed the project.
Document the entire design and build process of the chemical device and include videos, pictures, and screen captures of the processes.
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.
Include the name of the person who was in-charge of every part of the project.
Document my individual contribution to this project.
Provide the link to the page of the blog of my teammates.
Describe problems encountered and how the team solved them.
Include all the project design files as downloadable files.
Embed the final prototype design file, i.e., the final fusion360 design file showing the entire prototype.
Type my Learning reflection on the overall project development.
1. My team's chemical device
Background information about the issue
According to the Singapore Police Force, drunk driving was the major cause of road traffic accidents in Singapore. The amount of individuals arrested for driving under the influence has remained above 1500 since 2019. Channel News Asia also indicated in late 2022, that deaths from drunk driving accidents have doubled in 2022 as compared to in 2021.
According to Singapore's law, an individual is considered to be intoxicated/driving under the influence of alcohol if they exceed 35 mg of alcohol per 100ml of breath or 80 mg of alcohol per 100ml of blood. It was proven that those who drive above the legal limit of 0.08% BAC were 11 times more likely to get into a car accident as compared to a sober person
Taking these statistics into mind, my group quickly realised how widespread and problematic drunk driving as an issue has become. Therefore, we decided that the best course of action would be to design a solution that would keep both the driver and the pedestrians safe. This lead to our project statement being: 'How do we help prevent drivers in Singapore from driving under the influence of alcohol?’. Our main targets are those who are casual drinkers that also drive as a frequent mode of transport.
Our Chemical Product:
It is a breathanalyser which inbuilt in the car, and powered by the car battery. In order for the driver to be able to start up the car, he would first have to pass the breathanalyser test by blowing into the mouthpiece of the breathanalyser. If the driver’s blood alcohol count (BAC) is less than 35 mg of alcohol per 100ml of breath, the lid will be open and the driver would be able to insert the key into the keyhole to start the vehicle’s engine. The BAC will also be displayed on the LCD of our device.If he does not pass the test, the car keyhole will remain closed, preventing him from starting up the car engine. The driver can then choose to sober up before retaking the test, or take an alternate form of transport home for the moment, coming back the next day to retrieve the car. This keeps the driver from getting into any accidents and therefore preventing him/her from hurting anyone else.
One aspect of our breathanalyser that differentiates it from a typical one, is the fact that it also measures the temperature of the breath and takes that into account. Most commercial breathanalysers are often calibrated at 34 degrees centigrade. However, after multiple continual uses of the device, the temperature of the device rises causing inaccuracies in the readings since the breath of people tends to come closer to 35.5 degrees centigrade instead when driving under the influence of alcohol. Hence this leads to a 10% to 20% increase in the obtained concentration reading as compared to the actual value. To make sure we get an accurate reading, we have decided to install a cooling mechanism in our final product.
A hand sketch of our product is displayed below.
2. Team Planning, Allocation and Execution
These are my team members and their roles:
Chief Executive Officer (CEO) - Sreenithi
Chief Operation Officer (COO) - Jun Yi
Chief Financial Officer (CFO) - Abhishek
Chief Safety Officer (CSO) - Matthias(me) & Eng Kiat
Our Finalised Bill of Materials(BOM)
Finalised Gantt Chart
Task allocation:
CADD (Fusion 360) & Laser cutting - Sreenithi & Eng Kiat
Arduino Programming - Jun Yi & Abhishek
3D Printing - Matthias
Product Assembly - ALL
3.Design and Build Process
Initial Brainstorming:
During our first design brainstorming, we decided we had 4 key needs within our product. These were for it to be reusable and to be of high accuracy.
Reusable: We made it reusable by designing a mouthpiece that can be detached and washed so that it can be clean while not creating any waste, which would be problem if the mouthpiece was single-use.
High accuracy: By implementing a temperature sensor together with our alcohol sensor. Since the temperature of a breath was slightly higher than the ideal measuring tempering by the alcohol sensor, we decided to include a temperature sensor to catch any deviations in temperatures, which could be used to correct the alcohol sensor's inaccuracies. We also implemented vents into our design, as this would allow the hot air to escape quicker, leading to the sensor being kept at the ideal temperature.
Task Allocation:
We decided to split the work required to manufacture the product, in order to speed up our progress and divide the workload equally.
Eng Kiat and Sreenithi were in charge of constructing designs on Fusion 360 for the body of the breathanalyser and the mouthpiece.
Jun Yi and Abhishek were in charge of the arduino programming for the LCD display of the alcohol level and temperature level.
I was in charge of coming up with and constructing the mechanism of the device.
Our 1st sketch for our prototype is displayed below:
Part 1. Design and Build of Reusable Mouthpiece and Laser Cutting (Done by Sreenithi)
Part 2. Design of breath analyser body and Laser Cutting (Done by Eng Kiat)
Part 4. Assembly of prototype (Done by ME, Sreenithi, Eng Kiat, Abhishek and Jun Yi)
After all
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