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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 EQ My Block

The EQ My Block provides an equation that controls the power of the motors. This equation determines if the robot needs to accelerate to stay upright. We are solving the inverted pendulum problem with this calculation. By the end of the EQ My Block, a new value is generated for the pwr variable block (the power variable).

A series of three Advanced Math blocks are used to calculate the value of the power variable, which in turn leads to the control of the motors. Although the Cdrv variable block affects how we control whether the robot drives forward or backwards, it is the value of the pwr variable block that sets the level of motor speed to keep the robot upright. Essentially, we are trying to determine whether the robot needs to accelerate to stay upright. If the Advanced Math block could handle more inputs, then only one Advanced Math block would be needed. The value of the power variable is based on input from several numeric variable blocks, including the Cdrv, time...

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