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Students design and test dynamic mathematical functions to control the position of the Servo Pointer and they see immediate results. The free-form functions are virtually unlimited in scope and can be used to control either the angular position, a, of the pointer (in degrees or radians) or the linear position, x, of a laser dot on a wall, a meter stick or another flat target. In manual mode, there can be up to three independent variables controlled by sliders or direct numeric input. In automatic mode, the independent variables can be either time, t, or real-time data from up to three analog probes. In addition to the position of the motor, students can use mathematical functions (e.g., t > 5) to control the laser. They can also program three other DC outputs. Unlike the Pointer / Power Pulley, motion of the Servo Pointer is restricted to a range from about -80° to +80°, but it provides a more convenient and less expensive system that is well suited to most demonstrations and student activities. Software is provided in the form of executable LabVIEW programs. It is not necessary for users to purchase or learn LabVIEW. A PC computer and Vernier's SensorDAQ interface is also required.
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