Car Introduction:

After successful assembly, the trolley can move forward along the black track with a width of about 15mm. The circuit consists of photoelectric sensing, voltage comparison, and motor drive. The principle is that the reflectivity of the light-emitting tube projected on the black and white parts is different, and the light intensity reflected to the receiving surface of the photoresistor is different, resulting in a change in the resistance of the photoresistor. The LM393 compares the size of the two photoresistors, controls the operation of the motors on both sides, and thereby corrects the car's direction to ensure that the car moves along the black track.

Kit Parameters:

Power supply voltage: 3V (the kit does not include batteries, you can buy two AA batteries yourself)

Board size: 7.2*10.5 cm

Main control chip: LM393 voltage comparator chip, without programming control, LM393 classic application circuit, teaching model



Usage Reminder:

Since many customers have asked why only one side of the wheel rotates after the trolley is installed, and the LED light on the top is on, it is hereby explained that after normal welding and assembly, when it is not on the track, it is normal for only one side of the wheel to rotate, and the LED light on the top of the same side is on, and both LED lights below are on. When it runs on the track, the wheels on both sides rotate alternately so that the wiring can be realized. For details, please refer to the welding production video (will be uploaded). If you want to make your own track, the track's turn should not be too large.



Soldering Tips:

The height of the main photoresistor and the LED light under the front of the car should be moderate, the photoresistor and the LED light should be parallel, placed on the ground, about 0.2-0.4 cm from the ground (you can see the picture if you are unsure), the sensitivity also mainly depends on the welding specification here. For installation of