EEL5666 – Spring 2005Special Sensor Report

R. Michael Ihns

Sensors

Solar Panel and Charging Circuit Infrared Sensor – Edge detection Ultrasonic Ranger – Obstacle Avoidance Pyroelectric Sensor – Wake up Input 3 CDS – Light Direction Sensing 1 CDS – Ambient Light Level Sensing

Solar Panel Array and Li-Poly Cell

Solar Panel 8.5V 100mA

Battery 7.4V 730mAh 31 grams

Edmund Scientifics Solar Cell, Thunder Power Li-Poly Cell

Lithium Polymer Charge Curve

Circuit Diagram

Testing

Property Measured Value

Battery Voltage 1.11V

Solar Panel Voltage 8.25V

Short-Circuit Current 70mA

Current Through Battery 70mA

Property Measured Value

Initial Battery Voltage 7.71V

Solar Panel Voltage 8.08-8.30V

Short-Circuit Current 90mA

Current Through Battery 10mA

End Battery Voltage 7.72V

2-Cell Lithium-Polymer Battery in 4.5 Hours of Full Sunlight

Single Cell 1.2V AA Nickel-Metal Hydride Battery

Conclusion

Need higher voltage solar panel