Learning Math/CS/Engineering Design with Robotics
LArduino Ultrasonic 4a: Collision Avoidance
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Objective: Combining concepts and code from previous activities, learn how to program a Linkbot robot with collision avoidance capabilities, using an ultrasonic sensor with a trigger distance at 6 inches (and blinking LED lights for effect). Overview: The pre-placed code blocks initialize an ultrasonic sensor and keep reading the sensor and blinking the green LED, as long as the distance read is greater than 6 inches. The new feature is to move the robot using the driveForeverNB command. (The "NB" stands for "nonblocking," meaning that the command starts driving the robot and then continues with the subsequent commands in the sequence.) Once a "too close" distance is read, the code stops the robot and the green blinking, blinks the red LED, backs up 5 inches, and displays a message. After you try running the code, modify it as directed in the Problem Statement.
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| Grid Size: S M L | Simple View: | MinView: |
| Coord: x-axis y-axis | Grid Lines: x-axis y-axis | |||
| Grid: | 12x12 inches | 24x24 inches | 36x36 inches | |
| 72x72 inches | 96x96 inches | 192x192 inches | ||
| 1x1 inches | 2x2 inches | Fraction: | ||
| xy-Range: | ||||
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| Quad: | 1 Quadrant | 4 Quadrants | 1&4 Quadrants | |
| Units: | US Customary | Metric | Ruler: | |
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Modify the code so that the "too close" distance is 4 inches, and the LED blinks blue instead of green while the robot moves. |
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Pre-Board Workspace
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Post-Board Workspace
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