Criteria for Success
TinkleTime toilet paper dispenser has the following features: durability, ease of maintenance, affordability, safe to use, able to manufacture at Rose-Hulman, it is appropriate in sizing, toilet paper tracking system, LED display that indicates the toilet paper level in each stall, and radio frequency-operated communication system for the toilet paper level in each stall on campus. We will be measuring a success based on the following methods.
Durability
The dispenser is able to withstand a light load such as a backpack (10 lb.)
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Results: We were successful at loading TinkleTime dispenser with 10lb. of weight without damage.
Affordability
The dispenser is able to be manufactured under $100
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Result: We have spent $44.45 on all of our materials, including the dispenser, which in real application is not a required item to purchase, since we can modify the existing dispenser.
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Able to Manufacture at Rose-Hulman
The dispenser is able to be manufactured within 3 weeks
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Result: All of our manufacturing process was completed within 2 weeks
Toilet Paper Tracking System Accuracy
Come within ± 3 mm accuracy on thickness measurements, which is equivalent to 19 sheets of standard 4.5 inches long toilet paper sheet.
(Calculation was done using a calculator on http://www.giangrandi.ch/soft/spiral/spiral.shtml )
Internal diameter: 45 mm
Thickness: 0.1mm
Length of each sheet: 114.3 mm
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Result: We have been able to measure the toilet paper thickness within 3 mm of accuracy. (see test results)
Radio-operated Communication System
This possible feature is functional; toilet paper dispenser successfully updates the data on the communication device.
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Result: The communication device was able to communicate with the dispenser through bathroom walls. (see test results)
Ease of Maintenance
The custodians can replace the toilet paper within a minute
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Result: The average time and median time for changing toilet paper were 12.21 and 12.15 seconds respectively.
Safety
Meets the Roses-Hulman policy on public bathrooms
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Result: We have met all of the OSHA Guidelines regarding toilet dispenser, which is what Rose-Hulman is required to follow. (There are no specific mentions about the toilet paper dispenser in public restrooms in the OSHA guideline.)
Apporpriate Sizing
The dispenser only adds 20% or less to the original toilet paper dispenser by volume
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Result: TinkleTime toilet paper tracking size has volume of 66.58 cm^3, which is about 11% of the dispenser. (This value was calculated with the use of SOLIDWORKS mass property feature)
LED Display for Indication of Toilet Paper Level
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Display how much toilet paper is in the dispenser outside the bathroom stall in three levels
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Full
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Medium
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Empty
Result: We were successful at indicating the three levels using green, yellow, and red LED lights, as well as wirelessly connected communication device.
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