1. The Team Formerly Known as NREL 2 Ryan Manning Eric Simley Arvind Talukdar

2. Presentation Outline Solar Tracker/DE2 Development Project Brief overview: Original Goals, Modified Goals System block diagram: Highlighting project essentials System Specifications (schematics… etc.) Software Descriptions Division of Responsibility Parts List: Obtained, not obtained Schedule

3. Recap The Problem Our Solution Original Project Goals Complete low-cost solar tracking system with monitor (VGA) and keyboard (USB) setup. Modified Project Goals Focus on essential areas: I/O, LCD, A/D, multiplexing system, stepper motor apparatus.

4. System Block Diagram Altera DE2 Board Stepper Motors/ Mechanical Apparatus Monitor/Interface Photodetectors Keyboard Solar Panel/ Battery Apparatus Mouse USB VGA I/O Non-Essential Essential

5. Photodetector Circuit

6. VGA Schematic

7. VGA Timing

8. Photovoltaic Cell Circuit

9. I/O Schematic

10. Software Photodetector Inputs Read Store Cycle Mux Ctrl Data Input Compare Inputs Max @ 90°? No Yes Motor Ctrl according to photodetectors Motor Ctrl according to PV power Solar Panel Input Power Optimized? No Done. Now sleep Yes

11. Stepper Motor Circuit

12. Driver Circuit Specifications Motor runs at 2.8A/step 4-Lead Bipolar Stepper Motor Supply voltage 12-42 V Level shifter for input to PWM and DIR Sign Magnitude PWM

13. Division of Tasks Stepper Motor Mechanical Apparatus – Everyone A/D and Multiplexing circuit – Eric Stepper Motor Driver Circuit and Control – Arvind PV Cell Power Management – Ryan I/O pin logic – Complete (Ryan) Monitor interface – Eric Keyboard interface – Ryan Algorithm Development – Eric and Arvind…and Ryan

14. Bill of Materials

15. Milestone 1 3/20 Functional Stepper Motor Circuit Control motor position using software Functional Photodetector Circuit Switch between multiple photodetector outputs Functional PV Cell Power Circuit Monitor instantaneous Power Output Charge 12V Battery

16. Milestone 2 4/17 Keyboard Input VGA Output Final PV Cell/Stepper Motor Hardware Complete

17. Schedule

18. Questions