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Disposable Mattress Cover with Conductive Threads to Detect Wetness using Resistance Comparison ECE 4884 L03 Advisor: Dr. Koblasz Team Members: Ankit Hemani Jacob Huang Yuval Rooz Heonwoo Song Sarju Vasavada Motivation • 2 million cases of nosocomial (hospitalacquired) infections annually (CDC) • Wet bedsheets increase risk of infection Design Objectives • Use biodegradable plastic and paper • Stitching conductive threads on the paper to detect wetness • Design a detection unit • Detect a break in the circuit • Detect wetness • Isolate electrical circuitry from patient Cost Analysis Item Price Paper $0.65 Thread $0.80 Biodegradable Polyethylene $0.20 Mattress Cover per unit cost $1.85 I.C.s $4.17 Circuit board $4.99 Encasing Box $6.99 RS-232, Power jacks $10.00 AC/DC Adapter $13.87 Fuse, Fuse Holder $3.40 Resistors, Capacitors, LED, Wires < $1.00 Detection Unit cost $43.42 Layout Of Mattress Cover On Hospital Bed Source: http://www.ponsishoes.com/products.asp Mattress Cover Construction • Plastic attached to paper using adhesive • Plastic on the bottom side, paper on the top Conductive Thread Stitching • Conductive threads laid out on paper in two loops, of 40 ft each • Regular threads used to stitch conductive threads on paper Power Supply • Transformer and fuse used to protect against voltage spikes 12V AC/DC Adapter + Transformer Fuse 9V Regulator Detection Unit Continuity detection Reading from mattress cover Wetness detection Opto-isolator Output Detection Unit Schematic Communication between Pad and Detection Unit • Plastic clip • Four metal pads contact the conductive loop on sheet • Wires soldered to pads connect the clip to the detection unit Modifications to Proposed Items Proposed Designed Reason Silver Thread Stainless steel More conductive Battery Wall Outlet Cumbersome Two Outputs One Output No need for two Phone-jack Plastic clip Faster attachment Opto-isolator Safety - Current Status • Stitched a paper bedsheet (has discontinuities) • Tested unit with a cotton bedsheet • Stitched a (non-working) paper bedsheet • Built detection unit • Designed a prototype connector Steps for Marketable Product • Include clip in connector • Casing for detection unit • Investigate cheaper conductive threads • Implement with full-size hospital bedsheet nor biodegradable polyethylene • Optimize resistances in detection unit Video • If time allows, video of a project demonstration Any Questions?