CHAPTER 15 ■ COMPARATORSAppreciating a Simple Mind
The line-following circuit is taking shape. The comparator makes a fine brain for this simple robot. The
comparator is inexpensive, fast, and accurate without being complicated to employ. However, it does have
some limitations that needed to be considered during design and testing.
The headlights provide consistent lighting for the photoresistor sensors. This allows the robot to run
in the dark and it eliminates the issue of the comparator failing at high values. Frankly, the headlights also
garner a lot of positive praise and attention for the robot.
The left and right LED indicators are working, which allows the sensors to be tuned. When you install
three LEDs for each side, the robot’s thoughts should be clearly visible from across the room. In the next
chapter, you’ll learn how you can interface the full sets of three LEDs to the comparator.