SunFounder picar-x - Minecart

SunFounder picar-x
5.14 Minecart
Let’s make a minecart project! This project will use the Grayscale module to make the PiCar-X move forward along
a track. Use dark-colored tape to make a track on the ground as straight as possible, and not too curved. Some
experimenting might be needed if the PiCar-X becomes derailed.
When moving along the track, the probes on the left and right sides of the Grayscale module will detect light-colored
ground, and the middle probe will detect the track. If the track has an arc, the probe on the left or right side of the
sensor will detect the dark-colored tape, and turn the wheels in that direction. If the minecart reaches the end of the
track or derails, the Grayscale module will no longer detect the dark-colored tape track, and the PiCar-X will come to
a stop.
TIPS
• Set ref to () block is used to set the grayscale threshold, you need to modify it according to the actual situation.
You can go ahead and run Test Grayscale Module to see the values of the grayscale module on the white and
114 Chapter 5. Play with Ezblock