**3.2 RVW content knowledge – sensors and geometry (CK)**

This section addresses the engineering and geometry content knowledge in the TPACK framework (**Figure 1**) that underpin the robot's build and associated properties of circle geometry at work. The RVW Vex IQ virtual robot has the same construction and sensors as the physical kit's "Clawbot" build. A *sensor* is a device attached

*Virtual Robotics in Hybrid Teaching and Learning DOI: http://dx.doi.org/10.5772/intechopen.102038*


### **Table 5.**

*Robot sensors with examples.*

to the robot's brain that detects the environment and sends numbers to the brain to report its findings. The programmer writes the code to respond to the robot's data to navigate the environment. **Table 5** lists the Vex IQ sensors, their purpose, and an example of how to use the sensor in a program.

It is necessary to understand circle geometry to employ the 360° properties of a circle to calculate the turns of the robot using the gyro. Additionally, students can arrive at the circumference of the robot's wheel to determine the distance in millimeters that the device travels in one rotation. Notice the length of the radius of the Clawbot IQ wheels on the start page of the Level Builder virtual robot (**Video 2**, https://drive.google.com/file/d/1Aj0sxMaZGRnMeIIa0Ni-jmis9fp7rQjj/ view?usp=sharing). The radius of the wheel is 3.2 cm. Therefore, the diameter of this circle is 6.4 cm. Students can use the formula Π \* 6.4 to calculate the circumference of the wheel to arrive at the distance that the robot wheel travels in one rotation. The circumference of the wheel in centimeters is approximately 20 cm or 200 mm. Using

the measuring beam on the virtual robot, the student can calculate how many rotations it will take to travel the Turning Challenge depicted in **Video 2**, https://drive. google.com/file/d/1Aj0sxMaZGRnMeIIa0Ni-jmis9fp7rQjj/view?usp=sharing.
