The Team Formerly Known as NREL 2

Ryan ManningEric Simley

Arvind Talukdar

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

Recap

The ProblemOur 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.

System Block Diagram

Altera DE2 BoardStepper Motors/

MechanicalApparatus

Monitor/Interface Photodetectors

Keyboard

Solar Panel/Battery

Apparatus

MouseUSB

USB

VGA

I/O

I/O

I/O

Non-Essential

Essential

Photodetector Circuit

VGA Schematic

VGA Timing

Photovoltaic Cell Circuit

I/O Schematic

Software

Photodetector Inputs

Read

Store

CycleMux Ctrl

Data Input

Compare Inputs Max @ 90°?

No

Yes

Motor Ctrl according to photodetecto

rs

Motor Ctrl according to

PV power

Solar Panel Input

Power Optimized?

No

Done. Now sleep

Yes

Stepper Motor Circuit

Driver Circuit Specifications

Motor runs at 2.8A/step4-Lead Bipolar Stepper MotorSupply voltage 12-42 VLevel shifter for input to PWM and DIRSign Magnitude PWM

Division of Tasks

Stepper Motor Mechanical Apparatus – EveryoneA/D and Multiplexing circuit – EricStepper Motor Driver Circuit and Control – ArvindPV Cell Power Management – RyanI/O pin logic – Complete (Ryan)Monitor interface – EricKeyboard interface – RyanAlgorithm Development – Eric and Arvind…and Ryan

Bill of MaterialsItem Quantity Price ObtainedAltera DE2 Core 2 $0.00 $0Solar Panel 1 $0.00 $0Phototransistor 25 $75.00 $12.00Stepper Motor 2 $60.00 $60.00Mux 3 $30.00 $20.00LMD18200 2 $22.00 $22.00AD9215 2 $22.00 $22.00Level Shifter 1 $0.85 $0.00Breadboard 1 $40.00 $40.00Halogen Lamp 1 $21.00 $21.00Misc. (Apparatus) Several $100 $0.00

$370.85 $197Budget $1,000

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

Milestone 2 4/17

Keyboard Input VGA OutputFinal PV Cell/Stepper Motor Hardware Complete

Schedule

Questions