Arduino-Based Vibration Alert System with Bluetooth Notification to Android

1#include <SoftwareSerial.h>
2
3// Create SoftwareSerial on pins 10 (RX), 11 (TX)
4SoftwareSerial bluetooth(10, 11);  // RX, TX
5
6const int vibrationPin = 2;  // Vibration sensor connected to D2
7const int buzzerPin = 8;     // Buzzer connected to D8
8
9bool vibrationDetected = false;  // To track state
10
11void setup() {
12  pinMode(vibrationPin, INPUT);
13  pinMode(buzzerPin, OUTPUT);
14
15  Serial.begin(9600);        // Serial Monitor
16  bluetooth.begin(9600);     // HC-05 Bluetooth module
17
18
19}
20
21void loop() {
22  int sensorValue = digitalRead(vibrationPin);
23
24  if (sensorValue == HIGH && !vibrationDetected) {
25    vibrationDetected = true;
26    digitalWrite(buzzerPin, HIGH);
27    Serial.println("Vibration Detected");
28    bluetooth.print("Vibration Detected\n");
29    delay(500);
30    digitalWrite(buzzerPin, LOW);
31    delay(500);
32  } else if (sensorValue == LOW) {
33    vibrationDetected = false;  // Reset state when no vibration
34  }
35
36  delay(200);  // Small delay for stability
37}