Team Kevin Thompson EE – Responsible for circuit design Sam Foster EE – Responsible for code which manages power distribution on the heated surface Craig Cogdill CompE – Responsible for graphical user interface Stanley Nestler MechE – Responsible for manufacture and analysis of physical prototype HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013

Outline 1. Team & Project Introduction 2. Final Goals 3. Prior Research 4. Current Work 5. Budget 6. Plans for Next Semester 7. Questions HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013

Customer Needs Current stovetops fall short in at least one of five major areas: 1) Number of heating elements 2) Size of the heating elements 3) Shape of the heating elements 4) Cookware material 5) Safety HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013

Final Goals Cook for people at Engineering Days –Create a surface which can heat any material of any size or shape, anywhere on the surface –Fully functional prototype Can boil water in any size cookware placed on the surface 100% duty cycle on all active elements Intuitive and user-friendly graphical user interface HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013

Prior Research Independent Study in Spring 2013 –LED prototype –Heated prototype –Android based graphical user interface HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013

Physical Design Original Design: Sheathed tubular heating elements –Benefit: Safety, reliability, simple electrical connections –Cost: $32 per element HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013 Sheathed Tubular Heating Element

Physical Design Solution: Uninsulated nichrome wire –Benefit: <$1 per element –Cost: Flexible and prone to short circuits HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013

Physical Design Solution continued: Refractory brick –Benefit: Maintain safe stovetop operation –Cost: Difficult to manufacture Final Design – Isometric Model HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013

Circuit Design Design Evolution: First design –Temperature controlled by gate voltage Second design –Temperature controlled by number of active current sources Present design –Temperature controlled by amount of time full power is applied to an element HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013

Circuit Design Present Circuit Design HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013

Power Management Code Progress this Semester: –Duty cycle –Optimized algorithms –Thorough code testing HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013 Flow Diagram for Power Management Code

GUI HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013

Bill of Materials HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013

Plans for Next Semester Begin small scale testing of new circuit design Define packet structure for GUI-microcontroller communication Manufacture physical design Test code thoroughly HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013

Conclusion This semester has been productive! We ran into challenges and we found engineering solutions We are closer to our final goal HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013

Questions? Thank you for your time! For more information, please visit HexHeat.com. To contact us, please fill out the form under the Contact tab at HexHeat.com. HexHeat Senior Design Colorado State University End of Semester Presentation December 11, 2013