Create a Line Follow Car with Micro:bit


LUCY 发布于 2018-01-19 16:43


The so-called line follow car means a car follows a black line on the white(or light color)ground. Because the black line and white ground have different reflections to the light, the car can drive according the the strength of the light reflection received. Today, we are going to make a line follow car with micro:bit.

enter image description here

In this project, we will mainly use micro:bit and motor:bit.

More details about micro:bit, you can read:Start Your Micro:bit Programming Trip
More details about motor:bit, you can read:Elecfreaks Motor:bit User Guide

Weld motor cables. If there are no lead cables on your motors, you have to weld cables for them.

Alt text

Within the package of car chassis, there is a drawing for instruction. You can refer to its instructions and assemble the chassis.
Once finished, you will see the chassis below:

Alt text

Fix motor:bit to the chassis of the car.

Alt text

Plug the two groups of motor cables into connector  and .

Alt text

Install line follow modules and pay attention to their space. In this project, the space of two line follow modules is about or a little bit smaller than the width of the black adhesive tape.

Plug the two line follow modules into  and  separately.

Alt text

Connect with 6~12v DC power supply. Here, we have connected 2 segments of 18650 batteries in parallel, and then plugged a micro:bit.

Alt text

You can see the whole electric circuit in the below:

Alt text

Draw a trace on the ground with a black adhesive tape.
You have to pay attention to the width of the tape. It is a little bit bigger than the width of two line follow modules.

Please download the program below into micro:bit, watch out the rotating directions of the two motors. According to this program, the motors should both move forward. If one motor in the opposite direction, you have to change the cable connection of the motor in error and reconnect motor:bit.

Alt text

Adjust line follow module to enable recognition of black lines and white base board. If the recognition is not available, you can adjust the sensitivity of the potentiometer on the module.

Since hardware connection is completed, we can start to edit our program now. In this case, lots of pins and micro:bit built-in LED dot matrix can be used repeatedly, so firstly we should turn off the LED screen.

Alt text

Write program for forwarding, stopping, turning left and right. Control the rotate speed of the motor through . Bigger value it has, the motor rotates faster.

Alt text

According to the logic below, write your main program of line follow project.

Alt text

Alt text

You can click  directly to save the code into micro:bit.



Make A Cool Micro:bit Hovercraft Together

Elecfreaks Motor:bit User Guide







6粉丝 62作品 15随笔
  关注 私信


阅读数: 4083