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Walls Tell Stories (Golconda Fort Acoustic Echo & Cannon Physics Bot)

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Explore Golconda Fort! Speak into a clap-echo acoustic tube to measure sound wave reflection time (whispering gallery). Launch ping-pong cannon balls from a servo-aimed cannon model using projectile physics.

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Props & Materials Required

  • •Golconda Fort cardboard model (Bastions, Gateway, Whispering Gallery)
  • •Sound decibel sensor module + acoustic echo tube
  • •Spring/Servo-loaded ping-pong cannon launcher with angle guide
  • •ESP32 controller board
  • •0.96-inch OLED display screen
  • •DFPlayer Mini MP3 module + 3W speaker

Step-by-Step Instructions

1

Clap at Fort Main Gate

Clap hands at the main gate acoustic tube. Sound sensor detects clap impulse.

2

Measure Echo Sound Reflection

Sound waves travel down the acoustic tube and bounce back. OLED displays 'Echo Time: 0.12 seconds | Distance: 20 Meters'.

3

Aim Bronze Cannon at 45 Degrees

Set cannon angle to 45° (maximum projectile range angle).

4

Fire Cannon & Track Range

Press 'FIRE!'. Cannon launches ping-pong ball. OLED displays 'Range: 3.5 Meters! Target Hit!'

Why It Works & Notes

Golconda Fort features incredible engineering: a clap at the main gate echoes clearly at the hilltop palace 1 km away to alert guards, while thick bastions housed heavy bronze cannons. Building acoustic echo tubes and cannon launchers links history with physics.