Project development
1. Our team’s chemical device
Our team’s chemical device is an anti-drink driving system
that is implemented in cars.
The device is placed above the head rest of the driving
seat. The driver will breathe into the sensor and if it is above the legal
limit that is set, an alarm will be triggered, and a red LED will show. There
will also be an alarm sounded in the car, with water sprinkled onto the driver.
This system prevents the driver from drink driving.
The sketch of our chemical device is provided in the bottom
as shown:
2. Team Planning, allocation, and execution
Our team members consist of: Cyane, Pi Ti, Andrew and
myself.
Our finalised BOM is shown here:
Our finalised Gantt chart is shown here:
Our task allocation for this project is shown here:
|
Jun Heng |
Pi Ti |
Cyane |
Andrew |
|
Laser Cutting 3D-Printing |
Arduino Programming |
Assembling prototype Documentation Slides Preparation |
Designing of prototype Fusion360 3D-Printing |
3. Design and build process
CAD and Laser cutting
Task for laser cutting was done by me and Andrew; Andrew
came up with the CAD in Fusion360 while I facilitated the process of laser cutting.
Our product stand design is shown below.
The tank is slightly more complicated, and the 3D model is
shown here.
The .stl file for the tank top is in this link: https://drive.google.com/file/d/1VSO0c48kLhSktvVgsYuRRMVAULBRS9TS/view
The finished product of the tank:
Combination of 3D printed parts:
Arduino Programming:
Task for the circuitry and Arduino programming is done by Pi
Ti. The picture below shows the circuit set up.
This is the Arduino code input for the system: https://docs.google.com/document/d/1rX0z2p2pIA3A7zDo7XjsJyeQ4PW5oNX0/edit
This is a video of the code working: https://drive.google.com/file/d/1--pKRaFO3b9FJbZsbLuroO4DON-ttx_N/view
Assembly of product
Task for the product assembly is done by Cyane. The picture
below shows the final product assembled.
Below is a video of our prototype working: https://drive.google.com/file/d/1PizIxf8K28Axajx8SKlIsH_u2jj5mxWq/view
Problems & Solutions
The tank was inconsistent and poorly
printed during the first 3D printing session. It had a weak structure due to
the lack of infill as well as wall thickness. We had to readjust the infill
density and print speed to make the structure more solid.
For Arduino programming,
it was challenging to find a good reference to use for our alcohol sensor so
that our simulated circuit on TinkerCAD could respond. Pi Ti took reference of
an ultrasound sensor found on TinkerCAD and made use of referring to its
circuit.
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