Competitive VEX Robot Designer. Terminal Objective 3.2: program optical quad encoders in autonomous mode

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1 Competitive VEX Robot Designer Skill Set 3: Programmer I Terminal Objective 3.2: program optical quad encoders in autonomous mode Performance Objective: Given the components of a VEX robotics design system program optical quad encoders in autonomous mode to have the robot travel in a two foot square. Enabling Objectives: 1. explain the purpose of an optical quad encoder 2. explain how an optical quad encoder operates 3. draw a flow chart for using an optical quad encoder 4. program an optical quad encoder Laboratory Hardware: The following materials and hardware are required and unique to this lesson: Modified VEX Protobot easyc V4 for Cortex Learning Activities: 1. View PowerPoint presentation and complete Activity Sheet 3.2, Program Optical Quad Encoders in Autonomous Mode. Formative Evaluation: Activity Sheet 3.2, Program Optical Quad Encoders in autonomous Mode, will be used to assess student progress. The answers to Activity Sheet 3.2 are as follows: Short Answer 1. The encoder counts pulses and keeps track of the number in the variable name that you set for the encoder; this allows you to determine distance traveled and direction of travel. 2. The encoder works by shining light onto the edge of a disk outfitted with evenly spaced slots around the circumference. As the disk spins, light passes through the slots and is blocked by the opaque spaces between the slots. As the disk rotates, the encoder detects and counts the number of slots light has passed through (pulses) determining distance traveled and direction of rotation Developed by Trevor Robinson Lesson 3.2 page 1

2 3. A possible solution for the flow chart: inches Summative Evaluation: Performance Assessment 3.2, Program Optical Quad Encoders in Autonomous Mode, will be used to measure the performance objective. In addition, the following test items could be used to measure the enabling and terminal objectives on a unit or end-of-level test: 1. Optical quad encoders pass light though slots to count: A. electricity. B. reflection. C. delays. D. pulses. Developed by Trevor Robinson Lesson 3.2 page 2

3 2. Optical quad encoders determine: A. speed and distance. B. distance and direction. C. direction and speed. D. time and velocity 3. Which of the following is the equation to determine circumference? A. C = d x 3.14 B. C = d x r C. C = r x 3.14 D. C = 3.14 x d 2 4. If an optical quad encoder is rotating faster than the motor or wheel, the resolution will: A. be decreased. B. be increased. C. not change. D. not matter. Developed by Trevor Robinson Lesson 3.2 page 3

4 Performance Assessment 3.2 Name: Start Date: Skill Set: Programmer I Terminal Objective 3.2: program optical quad encoders in autonomous mode Performance Objective: Given the components of a VEX robotics design system program optical quad encoders in autonomous mode to have the robot travel in a two foot square. Performance Assessment Elements Acceptable Unacceptable 1. Flow chart for the program is drawn a) Correct symbols used b) Flow and logic matches objective 2. Robot functions properly a) Motors are working in unison b) Robot completes a two foot square d) Program terminates after the robot stops Note: All items must receive an acceptable rating to pass the objective. Evaluator: Date: Developed by Trevor Robinson Lesson 3.2 page 4

5 Activity Sheet 3.2 Program Optical Quad Encoders in Autonomous Mode Name: Date: Short Answer Directions: Write your answer in the space provided. 1. Explain the purpose of an optical quad encoder. 2. Explain how an optical quad encoder operates. 3. Draw a flow chart that utilizes optical quad encoders to have the robot travel in a two foot square. 4. Calculate the circumference of a wheel that is 2 inches in diameter. Developed by Trevor Robinson Lesson 3.2 page 5

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