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Double Century (Smart 999 Skip-Count Race Track)

Source:

Race a 2WD smart car along a numbered track with Hall-effect wheel encoder sensors. As the car crosses 100, 200, 300 ('Double Century!') milestones, the micro:bit flashes victory fireworks and speaks century facts.

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Props & Materials Required

  • •Numbered floor track mat (0 to 999)
  • •2WD robot chassis with wheel speed encoder discs
  • •Dual optical slotted photo-interrupter sensors
  • •BBC micro:bit V2 controller + motor driver board
  • •DFPlayer Mini MP3 module + 3W speaker

Step-by-Step Instructions

1

Set Milestone Goal

Program target milestone on micro:bit: 'Goal = Double Century (200)'.

2

Drive Robot Car

Drive the robot car along the track mat using micro:bit radio remote or joystick.

3

Wheel Encoder Distance Ticks

Optical wheel encoders count wheel rotations. The micro:bit LED screen live-counts: '50... 100 (Single Century!)... 150... 200!'

4

Double Century Celebration

At 200 ticks, car stops automatically. micro:bit flashes LED fireworks pattern while speaker plays stadium crowd cheers: 'DOUBLE CENTURY SCORED! 200 RUNS!'

Why It Works & Notes

Reaching milestone numbers up to 999 (Centuries, Double Century = 200, Triple Century = 300) links cricket run-scoring concepts to math. Wheel encoders measure distance ticks, turning physical car motion into live number tracking.