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Hide & Seek (Smart Coordinate Grid & GPS Treasure Navigator)

Source:

Hide 'treasure' items on an 8x8 grid mat. Program a 2WD robot car using (X, Y) coordinate commands (e.g. Move to X=3, Y=5). Hall-effect floor sensors read grid intersections and celebrate when the bot arrives at the target coordinate.

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Props & Materials Required

  • •8x8 floor coordinate grid mat labeled X (1-8) and Y (1-8)
  • •2WD robot car with optical wheel encoders
  • •8x8 magnetic Hall-effect sensor grid array
  • •ESP32 / micro:bit V2 controller
  • •16x2 LCD display screen
  • •DFPlayer Mini MP3 module + 3W speaker

Step-by-Step Instructions

1

Pick Target Treasure Coordinate

Draw a treasure card: 'Find Nani's house hidden at Coordinate (X=5, Y=3)'.

2

Block Code Grid Path

Program robot car: 'Drive X forward 5 grid units, Turn Left 90°, Drive Y forward 3 grid units'.

3

Robot Drives on Grid

Watch the robot car count grid lines as it drives across the mat.

4

Coordinate Arrival Verification

When the bot reaches grid intersection (5, 3), Hall sensor triggers! LCD displays '(5,3) ARRIVED!'. Speaker plays victory fanfare!

Why It Works & Notes

Coordinate geometry (X, Y axes) is best understood through grid navigation. Programming a robot car to drive to exact coordinate intersections (X=4, Y=6) turns abstract (X, Y) graphing into physical robotics pathfinding.