Detect Fall

Note

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Kit purchase

Looking for parts? Check out our all-in-one kits below — packed with components, beginner-friendly guides, and tons of fun.

Name	Includes Arduino board	PURCHASE LINK
Ultimate Sensor Kit	Arduino Uno R4 Minima	BUY
Elite Explorer Kit	Arduino Uno R4 WiFi	BUY
3 in 1 Ultimate Starter Kit	Arduino Uno R4 Minima	BUY
Universal Maker Sensor Kit	×	BUY

Course Introduction

In this lesson, you’ll learn how to use the MPU6050 sensor with the Arduino to build a simple tilt detection system.

When the device is tilted beyond a set threshold, an LED lights up and a buzzer sounds, providing a quick visual and audio alert.

Note

If this is your first time working with an Arduino project, we recommend downloading and reviewing the basic materials first.

• 1.1 Install Arduino IDE(Important)

• 1.2 Introduce of Arduino IDE

Required Components

In this project, we need the following components:

SN	COMPONENT INTRODUCTION	QUANTITY	PURCHASE LINK
1	Arduino UNO R4 Minima/Arduino UNO R4 WIFI	1	BUY
2	USB Type-C cable	1
3	Breadboard	1	BUY
4	Wires	Several	BUY
5	220Ω resistor	1	BUY
6	LED	1	BUY
7	MPU6050 Module	1	BUY
8	Active Buzzer	1

Wiring

Common Connections:

• LED

  • Connect the LED anode to a 1kΩ resistor then to the negative power bus on the breadboard, and the LED cathode to 8 on the Arduino.

• MPU6050

  • SDA: Connect to A4 on the Arduino.

  • SCL: Connect to A5 on the Arduino.

  • GND: Connect to breadboard’s negative power bus.

  • VCC: Connect to breadboard’s red power bus.

• Active Buzzer

  • Connect to breadboard’s negative power bus.

  • Connect to 9 on the Arduino.

Writing the Code

Note

• You can copy this code into Arduino IDE.

• To install the library, use the Arduino Library Manager and search for MPU6050 and install it.

• Don’t forget to select the board(Arduino UNO R3) and the correct port before clicking the Upload button.

#include <Wire.h>
#include <MPU6050.h>

MPU6050 mpu;

const int LED_PIN = 8;
const int BUZZER_PIN = 9;

// Threshold angle (adjustable)
const float TILT_THRESHOLD = 45.0;

void setup() {
  Serial.begin(9600);
  Wire.begin();
  mpu.initialize();

  if (!mpu.testConnection()) {
    Serial.println("MPU6050 connection failed!");
    while (1);
  }

  pinMode(LED_PIN, OUTPUT);
  pinMode(BUZZER_PIN, OUTPUT);

  Serial.println("Tilt detection system ready!");
}

void loop() {
  // Get acceleration data
  int16_t ax, ay, az;
  mpu.getAcceleration(&ax, &ay, &az);

  // Convert acceleration to angles (simple approximation)
  float angleX = atan2(ay, az) * 180 / PI;
  float angleY = atan2(ax, az) * 180 / PI;

  Serial.print("AngleX: "); Serial.print(angleX);
  Serial.print("  AngleY: "); Serial.println(angleY);

  // Check tilt
  if (abs(angleX) > TILT_THRESHOLD || abs(angleY) > TILT_THRESHOLD) {
    digitalWrite(LED_PIN, HIGH);
    digitalWrite(BUZZER_PIN, HIGH);
  } else {
    digitalWrite(LED_PIN, LOW);
    digitalWrite(BUZZER_PIN, LOW);
  }

  delay(200);
}