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Seth Bourn with Ted Hench, Kevin McIntire, & Sonya Pursehouse. Electronics and Control System Design and Development. Long Term Objective. Provide GPS Payload Tracking Stabilize Payload After Separation and During Turbulence Direct Payload to Pre-Determined Coordinate - PowerPoint PPT Presentation
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Electronics and Control System Design and
DevelopmentSeth Bourn
with Ted Hench, Kevin McIntire, & Sonya Pursehouse
Long Term Objective
• Provide GPS Payload Tracking• Stabilize Payload After Separation
and During Turbulence• Direct Payload to Pre-Determined
Coordinate• Maintain Sensor Operation and
Scientific Data Handling
Current Status
• Provide GPS Payload Tracking• Maintain Sensor Operation and
Scientific Data Handling• Stabilize Payload After Separation
and During Turbulence
Control System Overview
• Option 1: Accelerometer– Use Accelerometer to measure the
acceleration of gravity– Accelerometer is mounted parallel to the
surface of the earth– As angle of payload changes,
accelerometer reading will equal:
A(t) = g sin(θ(t))
Accelerometer Issue
• The accelerometer works perfectly in the static case
• Due to how the sensor must be mounted, it can give a false positive
• Forward acceleration will read as a “nose up” pitch
• Since forward velocity and pitch are coupled, these readings can skewed results
Control System Overview
• Option 2: Gyroscope– Gyroscope measures the Rate of
Rotation experienced by the payload– Reading is not biased by inertial
translation– Challenges lie in programming and
computational overhead
Recent Issues
• Ongoing problem of sensor accuracy• Signal Noise• Microcontroller latency during servo
actuation
Solutions
• Zeroed Analog to Digital Converter– By providing a reference voltage, errors
were reduced from 10% to 0.1%
• Research into Secondary Controller for Servo Actuation– Possibility of using a 4017 Decade
Counter to handle pulsing output for Servos.
On the Horizon
• Development of AVR Microcontroller to replace current BASIC Stamp
• Addition of second BASIC Stamp to alleviate processing load and increase speed.
Thank You
Questions?