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free-fall-detection-using-3-axis-accelerometer-5467af-en.md

Physics in Software: Free Fall Detection

The Free Fall Detection project is the bedrock of quadcopter failsafes and high-altitude weather balloon telemetry systems. The Arduino must aggressively interrogate the MPU6050 6-Axis IMU over I2C to determine if gravity has "disappeared."

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Acceleration Vector Math

When sitting on a desk, the MPU6050 reads X=0, Y=0, Z=1G because Earth's gravity is pushing down on it at 9.8m/s².

  1. The Disappearance of Gravity: When an object is dropped from a roof, it enters free fall. It is accelerating at exactly 1G downwards. To the sensor inside the falling box, gravity ceases to exist.
  2. The sensor suddenly outputs: X=0, Y=0, Z=0.
  3. The Algorithm Loop: You use the Pythagorean theorem in 3D space to calculate the total vector magnitude of acceleration regardless of orientation: float totalAccel = sqrt(sq(ax) + sq(ay) + sq(az));

Parachute Deployment

If totalAccel drops below a strict threshold (e.g., 0.3G) for 20 milliseconds (to avoid false triggers from jumping):

  • The Arduino throws an interrupt.
  • It spins a massive MG996R Servo 180 degrees.
  • The servo arm pulls a mechanical pin out of a spring-loaded housing, violently ejecting the drone's recovery parachute into the air long before it hits the ground!

Core Requirements

  • Arduino Nano (Small weight footprint).
  • MPU6050 3-Axis Accelerometer / Gyroscope.
  • High-Speed Micro Servo.
  • A heavily padded test-capsule!

ข้อมูล Frontmatter ดั้งเดิม 

title: "Free Fall Detection Using 3-Axis Accelerometer"
description: "Detect the drop! Write complex mathematical algorithms using an MPU6050 accelerometer to instantly deploy parachutes or parachutes upon detecting zero-gravity free-fall."
category: "Science & Simulation"
difficulty: "Intermediate"