Working Principle:

• The chip LM393 is comparing the sizes of the two photosensitive resistors at any time. When there is an imbalance (for example, one side of the black runway), the motor is stopped immediately, and the other side of the motor is rotated to make the car correct and return to the correct direction. The whole process is a closed-loop control, so it can be controlled quickly and sensitively.
• Photosensitive resistance, which can detect the strength of the outside light, is smaller the stronger the external light, and the weaker the outside light, the greater the resistance value.
• When the red LED light is projected onto the white area and the black runway, the resistance value of the photosensitive resistance will obviously increase, which will facilitate the control of the subsequent circuit.

Assembly Steps:

First step: the basic welding of the circuit part.

• The circuit welding part is relatively simple, and the welding sequence is according to the principle of the height of the component from low to high.
• First, when welding 8 resistors, it is necessary to use the multimeter to confirm whether the resistance is correct, and the welding with polar components such as the triode, green indicator, and electrolytic capacitor must be divided into the direction of the component in our picture as far as possible.
• When the welding capacity is reached, the pin is inserted into the side of the shadow on the PCB screen. When welding green LEDs, it is important that the pin is long and the welding time is not too long or easy to weld.
• D4 D5 R13 R14 can be temporarily unwelded, and the integrated circuit chip can be unplugged. Please check carefully after the initial welding is completed.

Second step: mechanical assembly

• The universal wheel screws are threaded into the PCB hole and screwed into the universal wheel nut and the universal wheel.
• The battery box is attached to the PCB by double-sided adhesive. The extraction line is welded to the PCB through the PCB reservation hole.
• The red line is connected to the 3V power, the yellow line is grounded, and the redundant lead can be used for the connection of the motor.
• The machine part assembly can first assemble the wheel; the wheel is made up of three pieces of black acrylic. Before assembly, please uncover the protective film.
• The center hole of the most inner wheel is a long, round hole. The diameter of the wheel in the middle is small. The center of the wheel on the outside is round,fixed with two screws and nuts, and using the black self-tapping
• The screw is fixed to the rotating shaft of the motor, and finally, the silicone tire is sheathed on the wheel. Use the lead wire to connect the motor lead line well.
• Finally, the wheel assembly is stuck in the PCB position with the dry glue. Notice that the wheel and the PCB edge have enough clearance to weld the motor lead to the PCB.

Third step: installation of the photoelectric circuit

• The photosensitive resistance and the light emitting diode (attention polarity) are installed in the reverse PCB, and the ground space is about 5 mm, and the distance between the photosensitive resistance and the light emitting diode is also about 5 mm. Finally, it can be tested with electricity.

Fourth step: Vehicle debugging

• After loading 2 AA batteries in the battery box, when the switch is pressed down, the car's correct driving reverse is driving along the universal wheel.
• If you hold the light resistor on the left, the wheel on the right side of the car should turn; hold the light resistor on the right, and the wheel on the left side of the car should turn; and if the car is back, it can be turned in at the same time.
• Change the wiring of the two motors. If one side is normal and the other side retreats, just switch back to the other side's motor connection.

Package Include:

• 1 x Intelligent Tracking Line Smart Car Kit (Battery NOT Included)