Background
For the fourth sketch, you will take a closer look at programming a sensor and using
a logic block. You will use the Line Finder Sensor to determine whether a surface is
light or dark.
The if-do logic block does exactly what its name suggests. Everything contained
within the loop will repeat consecutively until the sketch is ended with a command
or the Stop/Reset button (Figure 38).
Depending on the surface, a red or yellow LED will light up on the PULSE controller.
Execute the Code
Before you can upload the sketch to the PULSE, remember to check your
connections. Keep in mind that you added a new connection in digital sensor port
D2 with the Line Finder Sensor.
Upload the sketch. The green LED will light up, indicating the code is ready to
execute. When this has happened, press the green Start button on the PULSE
controller.
Hold the sensor over a contrasting surface. As the sensor moves from light to dark,
observe the red LED on the PULSE. When the sensor is over a nonreflective or dark
surface, the yellow LED will be on. When the sensor is over a white or reflective
surface, the red LED will be on.
Press the Stop/Reset button when you are ready to stop the sensor.
Figure 38
38 Getting Started Activities
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