BME100 f2015:Group5 1030amL3

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BME 100 Fall 2015 Home
Lab Write-Up 1 | Lab Write-Up 2 | Lab Write-Up 3
Lab Write-Up 4 | Lab Write-Up 5 | Lab Write-Up 6
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Name: Doug Brown
Name: Taylor Barda
Name: Mary Cauley
Name: Steven Stamm
Name: Alexandra Davis
Name: Andrew Soichiometry


Descriptive Statistics

Temperature Statistics

Heart Rate Statistics


In our results the gold standard had a slightly higher average heart-rate and temperature. Both graphs show similar results. The Spree Band may be a little less accurate than needed but it is consistent.


For the Temperature data, the Spree Headband was not as far off as expected. While it only rated body temperature on a scale of 1 to 4, the measurements were not far off when they were assigned approximate ranges of temperatures in degrees fahrenheit.The difference between the average reading on the Spree and the Gold Standard was only about 2 degrees. In addition to their similarities in averages, the Gold Standard and the Spree had similar standard errors as well. While the Gold Standard’s standard error was 0.060 the Spree’s was 0.069. These results that the Spree’s temperature readings were relatively accurate in comparison to the Gold Standard.

For the Heart rate statistics the Spree’s readings were also relatively accurate despite some technical issues in some individual cases. The difference between the average readings for the Spree and the Gold Standard was about 1bpm. A margin of error as small as this supported that when the Spree headband measured heart rate, it did so accurately. The standard error for the Spree was about 1.31 while the Gold Standard’s was only slightly higher at 1.34. All in all the data would support that the the Spree accurately measures heart rate when tested with the Gold Standard.


The Spree Headband had a large amount of flaws. The headband, while not being aesthetically pleasing, also did not provide comfort for the wearer, inducing a headache and making the size difficult to adjust. These two design flaws go hand in hand, and a complete revamp of the headwear could make it more comfortable for the wearer, who has to wear it for an extended period of time while presumably exerting themselves, while also making it a more appealing piece of equipment. While they are taking these two things into consideration, the should also invest their time into researching new materials to use to cut the price down, which in the products current state is not worth anything near 300 dollars. While the headband itself was not up to par, the technology inside of it was also lacking. Before actual data can be recorded from the device, it must first connect to a phone via bluetooth. The bluetooth was not reliable and did not work for an extended period of time. For a device that relies on such a connection to record its data, the bluetooth needs to be more effective and reliable. When the user finally succeeds in connecting to the device, they must then deal with the hurdle which is the spotty heart rate monitor and the broad temperature system, which only gave a reading in 4 subsections, not the exact temperature of the wearer. In our tests, the heart rate monitor did not read the wearer's heart rate for twenty minutes. Although this will most not likely happen all the time, a better, more advanced system needs to be put in place so this does not happen at all. Generally, an athlete would not need to know their exact temperature, as a 4 subsection reader would be sufficient, but if an athlete did need to know, they would not have the ability to. The device is lacking in many areas and cannot be considered a reliable product. Both the band and the device are ineffective products which need to be completely redesigned before they should be resold on the market as a reliable, effective, product.

Design Flaws:

Uncomfortable for the head

Difficult to adjust the tightness and the size

Induced a headache

Not aesthetically appealing

Made test subject complain about excess sweat on the head

Did not read heart-rate for the first 20 minutes

Bluetooth connectivity was extremely difficult

The temperature is not specific and only gives a meter reading

It was extremely pricey.

Recommendations of how to improve the device:

Create a more detailed temperature monitor.

Make it more comfortable with better padding and maybe more sweat resistant material.

Make it more aesthetically pleasing.

Maker a more effective bluetooth connectivity.

Implement more accurate heart rate monitor system.

Figure out a way to decrease the price.


Target Population and Need

The SafeStyle targets three main groups of people: individuals with allergies, individuals who frequently travel on an international level, and individuals at risk for ingesting unwanted substances without consent. The SafeStyle has the capability to detect markers and chemical presences for a multitude of allergens, common toxins present in unprocessed water, and date rape drugs: ketamine, GHB, and Rohypnol.

Currently, there is no easy way of testing substances for certain compounds and chemicals without proper lab equipment and indicators. Those with allergies must either decide to take the risk of ingesting a food or not based solely on general and unhelpful information: presence of allergens in the production factory, presence of allergen in close proximity to food item, and nondescript statements such as "this item may contains peanuts." As for water quality, iodine purification tablets do exist, but are impractical for extended trips with limited space - as many serious backpackers and travelers have experienced. The SafeStyle would be a much better and more practical investment for frequent travelers in countries where the quality of the water is sub-standard to that of many westernized countries. Finally, a market has emerged for preventative technology and detection regarding date rape drugs. Yes, there exists a product in the form of nail polish whose color changes upon interaction with spiked liquids, however, this product caters mainly to the female population. The SafeStyle adds another realistic option for females and a safe form of detection for males.

Device Design

The SafeStyle is a unit composed of an encasing shell and a stylus along with all the necessary components of the product. The shell itself is composed of both stainless steel and polymorph plastic - creating a lightweight and durable case for the components. Aside from the stylus itself, the shell also houses the ultraviolet germicidal irradiation system that sterilizes the stylus every time it is retracted, the other half of the Bluetooth wireless system the connects to the smartphone application, and a long-lasting and rechargeable battery with an Android compatible charging port. The stylus contains various markers and chemical indicators in its bud. When such markers are activated by their corresponding allergen or toxin, a signal is sent down the stylus and into the shell. If signal received corresponds with an allergen or toxin selected in the app, a notification is received. Each SafeStyle has its own unique barcode - required for connecting the device to a personal smartphone. Once the app is downloaded (for free) and the paired with the device, the ability to select personal allergens, drugs, and toxins of concern becomes available. These settings can be changed at any time.

Inferential Statistics

Turbidity Statistics

pH Statistics

Percent Composition Statistics


Turbidity Graph

pH Graph

Allergen Percent Composition Graph