Team Uno 10/14/04 Stephen Schwall Bunker Curnes Control Logic

Objective Light SensorsMicrocontrollerMotors InputOutput Changes in motor positions change input from light sensors

Input/Output System ● 3 Light Sensors located on top of umbrella canopy. ● 2 Motors – 1 rotating umbrella and 1 tilting umbrella canopy. ● Microcontroller checks 2 light sensors and rotates system until the 2 light sensor inputs are roughly equal (+/- 5%). This will orient umbrella in direction of the sun’s light. ● Next microcontroller checks 3 rd light sensor and tilts system until it is roughly equal to the other 2 sensors. This will aim the umbrella at the correct angle to the sun’s light.

Other Considerations Once positioned, the microcontroller checks the status of the light sensors every 15 minutes. This prevents the umbrella from constantly making minute adjustments and draining power. If no light source is detected over 2 checks (indicating that it is dark outside and the umbrella is no longer needed) the system will reset itself to an upright position. This will prevent tangling of the wires and puts the umbrella in the most stable position.

Control Logic Flow Chart Initialize Check Sensors 1 and 2 Move Motor 1 Check Sensor 3 Move Motor 2 Wait 15 minutes

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