Periodic measurement of nighttime weight change while asleep Week November 3 November 9 Client Timothy Juergens M D UW VA Hospitals Geriatric psychiatrist sleep specialist Phone 239 3030 cell E mail timothy juergens med va gov Advisor Wally F Block Tel 608 265 9686 E mail wfblock wisc edu Team Kyle Herzog Team Leader Ben Engel Communications Joe Ferris BWIG Eric Printz BSAC Problem Statement We would like to be able to measure this weight change accurately on people who are in hospital beds and be able to view and record the weight changes over various intervals through the night such as weighing a person who agrees to lay in bed all night at intervals of every 10 15 minutes This is important from a research perspective on numerous potential variables that may affect this weight change such as medications as well as sleep stage changes We would also use this to potentially track and eventually predict those at higher risk of developing obesity correlate with body fat measurements activity and assess for metabolic changes when we do things to improve correct sleep problems There is popular concern in the most recent sleep literature about various sleep stages insomnia and their impact on obesity This scale would likely have to support a hospital bed which sits on 4 legs and read at an accuracy ideally around 0 02 0 05 lbs many scales on the market record to such accuracy the more accurate the better I m not sure how the zeroed weight of the bed would affect this Ideally it would be a device we could move to a different bed without too much difficulty such as in 1 2 hours time without too complex recalibration Last Week s Goals Gain access to ECB labs Obtain materials to build test stand Build test stand Hook up waveform generator to ADC Accomplishments We met Friday during class time and filled out the necessary forms to gain access to the electronics lab the machine shop and the biomedical labs in ECB We picked up our access cards on Monday and can now work in these labs whenever we see fit We met on Monday night to prepare to build the test stand We found the materials necessary in the scrap metal and scrap materials areas on the machine shop We also found that will need two bolts and nuts to secure the load cell to the test stand Tuesday Kyle went to the police department to get the access card to ECB and also went to a hardware store and purchased the nuts and bolts Tuesday night Eric and Ben built the test stand We are now ready to begin hooking the load cell up to the ADC On Thursday night we will meet at ECB and hook up a waveform generator to the ADC We will see what kind of manipulations we can do with the data This Week s Goals Hook up load cell to ADC and see if we can get a reading on the computer Continue construction of prototype Difficulties The price of a precise enough load cell continues to be a problem The circuitry may be very intricate and require help from someone who is knowledgeable with circuits A prototype may have to be built that does not have the accuracy desired by Dr Juergens The test stand may require some complex construction The serial cable of the ADC is not compatible with all computers Successes We have purchased parts to build a prototype Purchasing a load cell this early will give us plenty of time to deal with the computer programming and circuitry aspect of the design We have begun the process of putting together our prototype We have completed the test stand Team Effort TEAM WEEKLY ACCOMPLISHMENTS Joe Ferris Team Meeting Individual Work prototype construction Kyle Herzog Team Meeting Individual Work prototype construction material purchase Ben Engel Team Meeting Individual Work prototype construction test stand construction Eric Printz Team Meeting Individual Work prototype construction test stand construction Project Schedule TASK DATES PROJECT WORK Brainstorming Ideas Research Designing Prototypes Choosing a Prototype Obtaining Materials Building Prototype Testing Prototype Modifications COURSE DELIVERABLES PDS Mid semester Report Mid semester Presentation Final Report Final Presentation Weekly Reports 8 15 SEPT 22 29 6 OCT 13 20 27 3 NOV 10 17 24 1 DEC 8 15 Notebooks MEETINGS Team Meetings Client Meetings Advisor Meetings BSAC Meetings OTHER Web Page Special Lectures Expenses to Date 83 DATAQ computer software 25 Aerocon 44 lbf load cell 25 Digital Scale 25 9 V Battery 4 Nuts and bolts 4
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