Microbit Robotics
60 mins
260 points
What you need:
  • Computer/laptop
  • Microbit
  • Move Motor Car
  • AA Batteries
  • USB Cable

Line Following Car

In this project we program the sensors on the Move Motor Car to detect and follow lines.

1 - Introduction

In this project we will be programming the Move Motor Car to follow a line track.

You will need the following:

  1. A Microbit
  2. A Move Motor Car (with 4 AA batteries)
  3. A USB cable
  4. A track drawn on paper or printed out using the attachment 'mbmmlfc tiles.pdf'

If you are drawing your own track make sure you use a thick black marker with clear lines.

2 - Create a new project

Go to the https://makecode.microbit.org website and create a new project.

3 - Add the extension

We are going to programming a Microbit to act as the brains of the Move Motor car. To do this we will need to add the kitronik-move-motor extension to our project. This has custom blocks that let us program the Move Motor car.

Add the kitronik-move-motor extension to your project. Once you add it you will notice that there is a new set of 'MOVE Motor' blocks in your toolbox.

4 - Create the variables

We need to create the following 3 variables:

  1. left - this will store the value of the left line sensor (how dark or bright it is).
  2. right - this will store the value of the right line sensor (how dark or bright it is).
  3. difference - this will store the value of the difference between the left and right variables.

Create the 3 variables and then add the following code to your project.

5 - Setup the LEDs

To make the car look even better and to give us some extra feedback, we are going to use the LEDs on the Move Motor car to light up different colours depending on if it's going straight, left or right.

Add the following code to your project to setup a variable for the LEDs.

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