Example Code for Quick Line Tracking

Introduction

Maqueen Plus V3 features a built-in line-tracking algorithm in its底层 chip, enabling simplified black-line following with a single block. This reduces programming complexity and frees the micro:bit for concurrent tasks (e.g., obstacle avoidance, music).

• Vehicle lights show 7 colors: red, green, yellow, blue, purple, cyan, white.
• Bottom RGB LEDs (0–3) are set to red individually.
• Line-tracking speed: Level 1 (slowest) to 5 (fastest).
• Once enabled, tracking runs continuously in the background until disabled.

Hardware Preparation

• Maqueen Plus V3
• Printed black-line track
• USB cable

Software Preparation

• MakeCode with Maqueen Plus V3 extension

Wiring Diagram

All sensors and actuators are pre-wired on the Maqueen Plus V3 mainboard.

Sample Code

View on MakeCode

Key Blocks Used:

• Maqueen Plus V3.lineTracking(Level.One)
• Maqueen Plus V3.vehicleLight(...) with multiple color settings
• Maqueen Plus V3.setBottomRGB(LEDIndex.All, R, G, B)

Result

• The robot automatically follows a black line on a white surface.
• Vehicle lights cycle through seven predefined colors.
• Bottom RGB LEDs remain solid red during operation.
• Line tracking continues until explicitly stopped in code.