Project Development !!
Finally, after so long, we have reached the final stage of our module.
1. Our Chemical Product.
We had the choice of different products, and our group picked the product of CO (carbon monoxide) gas sensor.
In our own idea, we will be putting the sensor to trip off an alarm in order to alert users that the level of CO is too high. Even though its just a gas, it is poisonous in high concentrations. However, the catch is that it is tasteless, odorless and colourless. Thus with the naked eye and our normal senses, it would be impossible to detect. Hence this is where our wonderful product comes to use.
2. Team planning
Team members : Myself as Hawkeye , Dorson as Iron Man and Derrick as Spiderman
This is our Finalised BOM after building the product :
as well as our Finalised Gantt Chart :
3. Design and Build Process
Part 1 : Design of Build of Casing and Lid ( by Me- Hawkeye )
Firstly I made it parametrically so I could easily make changes to my design easily without having to restart the entire design from step 1.
Next I made a rectangular sketch, offset it as well as a circle for the gas sensor hole.
After this, I extruded the base by thickness parameter, to ensure there will be a hole for the gas sensor
Then I extruded the sides of the box by boxheight parameter
Next, I created a sketch on the back wall to draw a circle for it to be extruded and to leave a hole for the wiring to power up the arduino board.
Next I created a sketch on the front side of the box to make the fitting for our LCD Display
After this, I extruded the main hole for the display as well as the 4 screw holes, each of 3mm diameter.
I also created a right angled hook shape on the back of the sketch to hold the lid we will be printing
As you can probably expect, I extruded the sketches by the width of the box, leading to this
At this point, I realised if we did not have a backpiece, the lid will just slide out if we tilted the box to one side
Hence, I extended the back piece of the box by 3mm.
Here is the finished product for the box!
Next component is the lid, and that was very simple.
First I created a sketch of the size 115mm by 72mm
Next I extruded it by 2.5mm and VOILA, a simple but functional lid
And here is the final lid product!
Hero Shots !!
Part 2 : Programming of LCD and CO sensor ( done by Derrick - Spiderman )
Blog link : Derrick's Epic Blog
Part 3 : Integration of parts and electronics ( done by Dorson - Iron Man )
Blog Link : Dorson's Awesome Blog
4. Problems and Solution
2 main issues :
1. The parts
2. The program
The parts -
Problem 1 :
We thought we needed components which we didn't have, hence we were not able to implement the fan component.
Solution 1 :
We decided to use one of our other ideas in which to impliment an alarm system to alert the user that there is a high level of CO in the surrounding area and that they have to either provide better ventilation or stop the cause of CO surge.
Problem 2 :
The box we first printed did not fit the parts that we had
Solution 2 :
I went back to fusion360 and changed the parameters of the box to fit the parts nicely.
The program -
Problem :
Value of CO on the display is fluctuating, and was not accurate, sometimes even showing negative values (theoretically not possible)
Solution :
We troubleshooted the code, found the issue and changed out the code completely from a different library to better match our CO sensor in order for us to get more accurate values in order for our product to work better and more effeciently.
5. Downloadable Links
Fusion 360/Curamaker Files
Thank you for the fruitful semester Dr Noel <3
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