Project Development
1. Our Product
When Covid-19 shook the world. We were advised to wear masks for protection. However, the virus continued on rampaging. The truth is that masks are only a small part of the protection we need. The virus can also be spread through touch.
Our product is a self-sterilizing door handle. We use door handles on a regular basis whether it be at home, school or work. Door handles are amongst the top 5 dirtiest objects in the household.
Our self-sterilizing door handle works by utilizing UV light as the sterilizer. A proximity sensor will detect when a hand touches the handle. Within 10 seconds (assuming the hand leaves the handle within 10 seconds) the UV light will turn on for 2 minutes to sterilize the door handle then proceed to turn itself off.
Team Planning, Allocation & Execution
CEO, Gideon - Coding & Assembling
CFO, Darren - Laser Cutting & Assembling
CSO, Adam - Sketching, 3D Printing, Laser Cutting & Assembling
COO, Gwyn - 3D Designing and Printing, Coding
Gant Chart
Planed Gantt Chart (Above)Actual Gantt Chart (Below)
Bill Of Materials
3. Design and Build Process (Documentation)1. Initial Design Ideas (Sketching) Done by Me
The two above were our initial design idea. The idea is that the UV light tube will be inside a UV transparent acrylic with proximity and motion sensors at the ends of the handle. The idea was not feasible however, as we couldn't have an actual UV light bulb. The acrylic tube was also troublesome as we could only purchase flat sheets off the internet that needs to heat-bend in order to be a cylinder. We couldn't heat-bend it at FabLab as we have not yet gone through proper training.We devised a new more practical design which involved an aluminium mirror to reflect the UV rays to both sides of the handle.
We did not follow through with the design above but combined the concept of all the designs we came up with. Which results in our actual design:
My Hero Shot
We decided to utilize a shorter transparent handle than the previous designs to cater to UV light bulbs instead of a tube. This way, our handle is much more compact, demanding less cost to produce.
2. 3D Designing, Printing and Laser - Cutting done by Gwyn
link to Gwyn's blog: https://cp5070-2021-2b02-group1-chyrvelgwyn.blogspot.com/p/project-development.html
Darren's Blog : https://cp5070-2021-2b02-group1-darren.blogspot.com/p/project-development.html
Before we planned to 3D print the case and the handle, we wanted to laser-cut acrylic and used them to build our handle and casing.
Due to some unforeseen problems with the laser-cutting, we made the decision to 3D print the handle and casing. This was never accomplished as it'll take a long time and by chance, we were given spare acrylic. Which we laser-cut and build into the prototype we have today.
Nevertheless, here is Gwyn's 3D Print Design:
Gwyn's Hero Shot
This is the design we used to laser-cut the acrylic:3. Coding done by Gideon
Gideon's blog link: https://cp5070-2021-2b02-group1-gideon.blogspot.com/p/project-development.html
For the coding, it was done by Gideon and Gwyn. At first, the proximity sensor was alien to us. After some research by Gwyn and Gideon, it was found that the 4 pins on the sensor are the trigpin, echopin andpulseIn. The trigpin as the output to produce soundwaves, the echopin acts as the input to receive soundwave while the pulseIn repeatedly detect soundwaves.
The Arduino is programmed to detect a hand at 13m away, wait for 10 seconds after the release of handle and turn on 20 minutes (this is done only for demonstration pruposes, actual sterilization requires 1-2 minutes) before shutting off.
Gideon's Hero Shot
4. Assembly of Casing and Electronics
Finally, we assemble the components. We used superglue to assemble the handle and casing as we didn't know that we could use acrylic glue available in the lab.
Darren's Hero Shot
5. Problems and Solutions
Laser-cutting -We had a lot of problems with laser-cutting. At first, we sent Gideon and Darren went to laser cut but they couldn't as some other team had been delayed and their slot was taken up. So we decided to try again, this time me and Gwyn went to laser-cut, however it turns out that the machine we booked for was down.
Solution - I decided to book another date. The third time was a charm as I laser-cut the acrylic without a problem.
Design: We had made and re-made a lot of designs, both sketches and 3D designing. This is due to changing problems we faced.
Solution: Our grit and resilience solved it.
Door handle
1: https://drive.google.com/file/d/1wdSdme29z7Wl5mV_Xd3clxJ8iLDrYr9v/view?usp=sharing
2: https://drive.google.com/file/d/1XsouV-4N5w6xZriw6d7ejcsGbeO6eOg0/view?usp=sharing
3: https://drive.google.com/file/d/1P9DJkBvOPeg1MhZQYk6Ijgg27Cn-lVJs/view?usp=sharing
Arduino Codes: https://drive.google.com/file/d/1HaYm0rrPoNSqB7s7udTJD373x0PItA4T/view?usp=sharing
Handle 3D Design: https://a360.co/36optPD
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