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Project History:
The previous teams that worked on this project decided to make it into a clothing iron shape. They decided that colloidal silver solution and UV-C lights were the best options for the elimination of germs. They designed the iron so that a sponge easily slides into the top, the sponge is filled with colloidal silver. The previous teams tested the effects of colloidal silver on mice and found that the effects were minor when ingested. The main iron uses a button on the bottom so that it only turns on when it is pressed onto a surface. The last time they worked on the project, they wanted to improve the handle for better ergonomics and the circuitry inside the main mechanism. Our second iteration improved their design. We locked the handle so that it doesn't move and is easy to control and added a track for the UV LEDs to organize them. We also made a system that presses the entire base into the button. Our 3rd iteration model was the most improved. We got rid of the handle and made the entire model smaller. We also made everything so that it is easily replaceable and removable.
Sanitation Test
Get a 48” x 24” unclean surface
Get a swab of the entire surface and put it in a petri dish as a control
Clean the surface of the first section thoroughly using the melamine foam and colloidal silver without using UV lights
Take a cotton swab from the surface and put it in a petri dish
Check Petri dishes and see if there are significantly fewer bacteria than control test
Repeat steps 1 - 6 until the bacteria amount looks similar to the control test
Results:
Control Test has some bacteria Two tables in a row were tested and there was no bacteria in either The table that we soaked in colloidal silver somehow had more bacteria than the first two tests that had less colloidal silver, this could be due to inaccurate test measures on our part.
It is possible to clean about 2304 square inches when the sponge is damp.
It is possible to clean about 2304 square inches when the sponge is damp.
this is our pre-prototype and above is our new and improved prototype all in one print witch the assemble isn't that good but other than that the only big problem is size witch our new prototype will be a handheld smaller unit
Test Methods:
Handle Trigger Test
Using trigger press down to activate the button
See if the light turns on
Release the trigger to deactivate the button
See if light turns off
Repeat 50 times
Results: The lights turned on all 50 times tested
Base Switch Test
Press down the baseplate onto a surface without holding the trigger
See if the light stays off
While holding base plate to a surface press the trigger
See if the light turns on
Release the base plate from the surface but hold the trigger down
See if light turns off
Release the trigger
See if light stays off
Repeat 50 times
Results: The lights turned on all 50 times tested
Springs Test
Press down the base plate and release
See if the springs bounce back the base plate to its original position
Repeat 50 times
Results: The springs/base have no way to stay in one place because the pegs are too short to fit all the way in the hole when base is fully extended.
Our original design used a distance sensor to activate the UV lights. The UV lights would turn on when the main unit got close enough to a surface while the button near the handle was pressed. The problem with this design is that it's very inaccurate, complex, and doesn't detect the surface very well.
9volt Battery Test
Hold the buttons down and let the lights turn on
Hold the buttons for 5 minutes
See if the battery overheats or stays cool
Results:
Adhesive test
Aggressively scrub a surface for 2 minutes
See if the sponge comes off of the base
Repeat test
Results: After 1 min and 20 sec of scrubbing on a rough surface, the sponge came off the base.
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