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DIY Line Tracking Ultrasonic Obstacle Avoider Robotics Car Kit

This product is a smart car developed based on UNO R3, which can realize four-way tracking function and ultrasonic obstacle avoidance function.


There are mainly four modules, including infrared signal detection module, main control module, motor drive module, and ultrasonic sensor module.


The smart car adopts a welding-free installation design. The components are fixed by copper pillars and screws. The circuit connection between each module is connected by DuPont wire, which is simple and convenient.



  • The main control board adopts CH340 UNO R3 development board.
  • The motor drive module uses a typical L298N module to drive a DC motor.
  • The infrared signal detection module uses four infrared light pairs to detect the black line and realize the tracking function.
  • The ultrasonic sensor module uses the HC-SR04 module, through which the distance is measured, so as to realize the ultrasonic obstacle avoidance function.




Technical Specifications
Microprocessor CH340G UNO R3
Power supply 2 removable 3.7v lithium batteries
Input Infrared sensor (four-channel infrared sensor module)
Motor DC geared motor
Motor drive L9110S module
Input Ultrasonic module (HC-SR04)


  • 1x CH340G UNO R3 development board 
  • 1x L9110S driver board
  • 1x HC-SR04 Ultrasonic Module 
  • 1x Four-way tracking module
  • 2x DC motor
  • 1x Ultrasonic bracket
  • 4x Rubber wheel 
  • 4x Speed measuring code wheel 
  • 8x T-shaped geared motor fixing bracket 
  • 1x 18650 battery box 
  • 3x M3*50 double pass copper pillar 
  • 8x M3*30 double pass copper pillar 
  • 2x M3*15+6 copper pillar
  • 17x M3 nut 
  • 33x M3*8 screw 
  • 8x M3*30 screw
  • 2x M2*8 screw 
  • 3x M2 nut
  • 4x M1.6*8 screw
  • 4x M1.6 nut
  • 1x 30cm male to female Dupont wire 
  • 15x 20cm male to female Dupont wire 
  • 8x 20cm male to male Dupont wire 
  • 4x 10cm male to female Dupont wire
  • 2x 10cm male to male Dupont wire
  • 2x Acrylic transparent 4-wheel car bottom plate
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