Project 2.10.21: Decibel Visualizer

Description	This project uses a sound sensor to measure noise levels and displays the result as Green (quiet), Yellow (moderate), or Red (loud) on a Traffic Light Module.
Use case	This project can be used in automation systems, interactive installations, and embedded control applications.

Components (Things You will need)

Building the circuit

Things Needed:

• Arduino Uno = 1
• Breadboard = 1
• Arduino USB cable = 1
• Sound sensor module = 1
• Traffic light module = 1
• Jumper wires

Mounting the component on the breadboard

Step 1: Place the Sound Sensor and the Traffic Light Module on the breadboard.

NB: Make sure all components are securely placed on the breadboard with correct orientation.

WIRING THE CIRCUIT

Step 2: Connect the VCC (+) pin of the Sound Sensor to the 5V pin on the Arduino using male-to-male jumper wires.

Step 3: Connect the GND pin of the Sound Sensor to the GND pin on the Arduino using male-to-male jumper wires.

Step 4: Connect the A0 pin of the Sound Sensor to the Analog pin A0 on the Arduino using male-to-male jumper wires.

Leave the D0 (Digital Output) pin unconnected.

Step 5: Connect the Green LED (G) pin of the Traffic Light Module to the Digital pin 4 on the Arduino using male-to-male jumper wires.

Step 6: Connect the Yellow LED (Y) pin of the Traffic Light Module to the Digital pin 5 on the Arduino using male-to-male jumper wires.

Step 7: Connect the Red LED (R) pin of the Traffic Light Module to the Digital pin 6 on the Arduino using male-to-male jumper wires.

Step 8: Connect the GND pin of the Traffic Light Module to the GND pin on the Arduino using male-to-male jumper wires.

Make sure to connect the Arduino USB cable to the Arduino board.

PROGRAMMING

Step 1: Open your Arduino IDE. See how to set up here: Getting Started.

Step 2: Type the following code in your Arduino IDE: const int soundPin = A0;, const int greenLED = 4;, const int greenLED = 4;, const int yellowLED = 5;, const int redLED = 6;, int soundValue; as shown in the image below.

Step 3: Type the following code in your Arduino IDE inside the void setup() pinMode(greenLED, OUTPUT);, pinMode(yellowLED, OUTPUT);, pinMode(redLED, OUTPUT);, Serial.begin(9600); as shown in the image below.

Step 4: Type the following code in your Arduino IDE inside the void loop() soundValue = analogRead(soundPin);, Serial.print("Sound Level: ");, Serial.println(soundValue);, if (soundValue < 350) {, digitalWrite(greenLED, HIGH);, digitalWrite(yellowLED, LOW);, digitalWrite(redLED, LOW); } as shown in the image below.

Step 5: Type the following code in your Arduino IDE inside the void loop() else if (soundValue < 600) {, digitalWrite(greenLED, LOW);, digitalWrite(yellowLED, HIGH);, digitalWrite(redLED, LOW); }, else {, digitalWrite(greenLED, LOW);, digitalWrite(yellowLED, LOW);, digitalWrite(redLED, LOW); }, delay(100) as shown in the image below.

Uploading the code

Step 1: Save your code. See the Getting Started section

Step 2: Select the Arduino board and port. See the Getting Started section

Step 3: Upload your code.

CONCLUSION

This project helps learners understand how to combine multiple components with Arduino to create more complex interactive systems and automation solutions.