1-There is a 16mm wide black track in the white area. Our tracking car can be driven automatically along the black track. How to twist the runway, The car can be driven automatically. we all know that the reflector is different when it is the source of light to white objects and black objects. we use a red light source here.Most light reflected from the ground through the photoresistor. By detecting the resistance of the light-sensitive resistor can determine whether the vehicle is driving in the white area. If the detection is black runway, then it will slow down the car and engine to change the driving direction or even the front of the PCB stops and the red LED. Drive the car in the opposite direction, so the car is always running along the Runway.

Note: There Are 2 Models of this robot we will send you one randomly check the pictures.  

2. Overview.

1>. Model: D2-1

2>. Name: D2-1 Intelligent Tracking Car DIY Kit

3>. Size of PCB: 105 * 72 * 1.6mm

4>. Installation size: 105 * 85 * 46mm

5>. Operating voltage: 3 V

3. Schematic.

Component list.