Objective: Experiment with an ultrasonic sensor by matching the results of a pre-placed distance vs. time pattern.

Overview: The pre-placed code uses a loop to get distance readings from the ultrasonic sensor at 1-second intervals for 10 seconds. It also keeps track of the time using a variable named "t," and uses the "point" block (from the Drawing section) to draw a red dot on the grid for each pair of (t, distance) values. Run the code, using your hand or a flat object (the flat object works best) to get different distance readings for the sensor and try to match the pre-placed pattern of blue points you see on the grid. Note that distances above 12 inches will not be displayed, because the grid is set up for a 12x12 display.