Liangshan School Cart

Based on the Liangshan School's intelligent car
features: ultrasonic obstacle avoidance, line tracking, and Bluetooth remote control (these two functions are not yet implemented due to soldering and hardware limitations).
The circuit design
uses two header pins to represent
battery levels and an ADC circuit to collect battery data. The LED section includes two headlights for illumination and two more for switching motion modes  
. A buzzer indicates battery level and provides obstacle warnings.  
 
The motor uses an N20 geared motor driven by a dedicated RZ7899 chip.  
The ultrasonic ranging section uses an HC-SR04 module .  
Two buttons are added for switching motion modes.  
Bluetooth is also implemented using a module.  
 
 
 
 
 
 
 
 
 
 
 
 


Physical demonstration and
precautions:
Pay attention to the orientation of the photoelectric switch during soldering (this is why line tracking failed to recognize the device).
Demonstration video.