Line-Following Robot Kit – DIY Unassembled Soldering Project

There is a 16 mm wide black runway in the white field.Our tracking
car can drive along the black runway automatically.No matter how the
runway is bent, the car can be driven automatically.We all know that the
reflectivity is different when the light source to the white objects and
black objects.Here we use red light source.The light is reflected through
the ground to the photoresistor.By detecting the resistance of the
photosensitive resistor can determine whether the car is driving in the
white area.If the detection is black runway, then the car to change the
direction of driving and motor will slow down or even stop and Red LED
OFF on PCB front side.Drive the car in the opposite direction so that the
car is always running along the runway