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Learning Lego Mindstorms EV3

You're reading from   Learning Lego Mindstorms EV3 Build and create interactive, sensor-based robots using your LEGO MINDSTORMS EV3 kit

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Product type Paperback
Published in Jan 2015
Publisher
ISBN-13 9781783985029
Length 284 pages
Edition 1st Edition
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Author (1):
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Gary Garber Gary Garber
Author Profile Icon Gary Garber
Gary Garber
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Table of Contents (14) Chapters Close

Preface 1. Engineering Notebook FREE CHAPTER 2. Mechanical Design 3. Drive Train and Chassis 4. Sensors and Control 5. Interacting with EV3 6. Output from EV3 7. Advanced Programming 8. Advanced Programming and Control 9. Experiment Software and Data Logging 10. Other Programming Languages 11. Communication between Robots 12. Advanced Robot – Gyro Boy Index

The GG My Block


The GG My Block gets Gyro Sensor feedback and calculates values to store to the Gyro rate and angular position variables. The variable block gSpd stores the current rate of rotation of the Gyro Sensor after accounting for the offset bias. The calculation is not quite as simple as subtracting the bias as we can see from the detailed equation inside the Block Text Field of the Advanced Math block. A new Gyro offset is actually calculated from 99.95 percent of the old gOS variable block and 0.05 percent of the current Gyro rate. This is to account for increased bias over time. It is this new Gyro offset that is subtracted from the current Gyro Sensor block value to return the value for the gSpd variable block.

As opposed to measuring the angle value of the Gyro Sensor directly, the value of the gAng variable block is calculated by integrating the value of the Gyro rate. The value of the gSpd variable block is multiplied by the unit of time over which it is integrated, is equivalent...

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