Features: With this smart tracking car DIY kit, you can familiarize yourself with the theory of mechanisms and learn about photoelectric sensors, voltage comparators, motor drive circuits and other related electronic knowledge during assembly. The light-sensitive resistance can detect the strength of the outdoor light. The stronger the outdoor light, the smaller the resistance. When red LED light is projected onto a white and a black area, the light-sensitive resistance is different due to the different reflection rate, which is convenient for controlling subsequent circuits. LM393 is an integrated dual channel voltage comparator circuit consisting of two independent precision voltage comparators. It is used to compare two input voltages and change the output voltage according to the input voltage. The specially designed motor has a reduction gear and significantly reduces the level of difficulty, which is very suitable for use. LM393 compares two photosensitive resistors and stops one side motor when the resistance has an imbalance. The motor on the other side rotates faster to get the car back in the right direction. The entire process is a closed loop control, so that it can be controlled quickly and sensitively. Installation Instruction:Step 1:Welding Circuit The electric welding part is easier, the welding order follows the principle of component level from low to high, the first eight welding resistors. It is important to use a multimeter to confirm that the resistance is correct. Step 2: Mechanical assembly The red line is connected to the positive 3V power supply, the yellow line is grounded, excess cable can be used as a motor cable. crotch