Arduino Nano-Controlled Lighting System with Gesture and Sound Interaction

This project is an advanced smart lighting control system powered by the compact Arduino Nano. The system allows users to control multiple AC bulbs using hand gestures and sound commands, making it an innovative home automation and IoT-ready project.

The setup integrates a 4-channel relay module to safely control high-voltage bulbs, along with a gesture sensor and a sound sensor module. The Arduino Nano processes sensor inputs and activates the corresponding relay channels to switch lights ON or OFF.

Components Used

Arduino Nano
4-Channel Relay Module
Gesture Sensor Module
Sound Sensor Module (Microphone-based)
AC Bulbs
Power Adapter
Connecting Wires

How It Works

1️⃣ Gesture Control

The gesture sensor detects hand movements (left, right, near, far).

Based on the detected gesture, the Arduino Nano switches specific relays to control individual lights.

2️⃣ Sound Interaction

The sound sensor detects claps or sharp sounds.

When a clap is detected, the system toggles lights ON/OFF instantly.

3️⃣ Relay-Based Switching

The relay module acts as a bridge between low-voltage Arduino signals and high-voltage AC bulbs, ensuring safe and efficient switching.

Key Features

✔ Touchless gesture-based light control

✔ Clap-to-toggle lighting system

✔ Multi-channel independent bulb control

✔ Safe AC load switching using relays

✔ Expandable to full smart home system

✔ Suitable for exhibitions and competitions

Applications

Smart home automation projects
IoT-based lighting systems
Energy-saving automation
Science exhibition models
Engineering mini projects

Coding:

/*
 * Arduino Nano-Controlled Lighting System with Gesture and Sound Interaction
 * 
 * This code controls a lighting system using an Arduino Nano, a gesture sensor,
 * and a sound sensor. The system can turn on/off four AC bulbs connected to a 
 * relay module based on detected gestures and sound levels. The APDS-9960 
 * sensor is used for gesture detection, and the KY-038 sensor is used for 
 * sound detection. The relays are controlled via digital pins D4 to D7.
 */

#include <Wire.h>
#include <Adafruit_APDS9960.h>

Adafruit_APDS9960 apds;
const int soundSensorPin = A0;
const int relayPins[] = {4, 5, 6, 7};

void setup() {
  Serial.begin(9600);
  Wire.begin();
  
  // Initialize the APDS-9960 sensor
  if (!apds.begin()) {
    Serial.println("Failed to initialize APDS-9960!");
    while (1);
  }
  apds.enableGesture(true);
  
  // Set relay pins as outputs
  for (int i = 0; i < 4; i++) {
    pinMode(relayPins[i], OUTPUT);
    digitalWrite(relayPins[i], LOW); // Ensure relays are off
  }
}

void loop() {
  // Check for gesture input
  if (apds.gestureAvailable()) {
    int gesture = apds.readGesture();
    switch (gesture) {
      case APDS9960_UP:
        toggleRelay(0);
        break;
      case APDS9960_DOWN:
        toggleRelay(1);
        break;
      case APDS9960_LEFT:
        toggleRelay(2);
        break;
      case APDS9960_RIGHT:
        toggleRelay(3);
        break;
    }
  }
  
  // Check for sound input
  int soundLevel = analogRead(soundSensorPin);
  if (soundLevel > 512) { // Arbitrary threshold for sound detection
    toggleAllRelays();
    delay(500); // Debounce delay
  }
}

void toggleRelay(int relayIndex) {
  int currentState = digitalRead(relayPins[relayIndex]);
  digitalWrite(relayPins[relayIndex], !currentState);
}

void toggleAllRelays() {
  for (int i = 0; i < 4; i++) {
    int currentState = digitalRead(relayPins[i]);
    digitalWrite(relayPins[i], !currentState);
  }
}

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