Project 1.9.2: Sound Level Trigger

Description	This project shows how to monitor audio amplitude spikes using the sound sensor module and log threshold crossings to the Serial Monitor.
Use case	This project can be used in noise monitoring systems, industrial equipment monitoring, classroom or laboratory demonstrations, and environmental data logging to detect and record sudden increases in sound levels.

Components (Things You will need)

Building the circuit

Things Needed:

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

Mounting the component on the breadboard

Step 1: Place the sound sensor module on the breadboard.

NB: Make sure you identify the correct pin connections for the component.

WIRING THE CIRCUIT

Step 2: Connect the red jumper wire to the positive pin (+)/ VCC of the sound sensor and the other end to 5V on the Arduino Uno.

Step 3: Connect the blue jumper wire to the negative pin (-)/ GND of the sound sensor and the other end to GND on the Arduino Uno.

Step 4: Connect the green jumper wire to the D0 of the sound sensor and the other end to digital pin 4 on the Arduino Uno.

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 int soundPin = 4; as shown in the image below.

NB: Declare the sound sensor analog pin

Step 3: Type int threshold = 600; as shown in the image below.

NB: Set noise threshold value

Step 4: Type int soundValue = 0; as shown in the image below.

NB: Variable to store sound reading

Step 5: Type the following code inside the void setup(){} function pinMode(soundPin, INPUT);

NB: Set sound pin as input

Step 6: Type the following code inside the void loop(){} soundValue = analogRead(soundPin);

NB: Read sound sensor value

Step 7: Type Serial.print("Sound: "); Serial.println(soundValue); as shown in the image below.

NB: Print sound level

Step 8: Type if (soundValue > threshold) { as shown in the image below.

NB: Check if threshold exceeded

Step 9: Type Serial.println("NOISE DETECTED!"); as shown in the image below.

NB: Alert message

Step 10: Type delay(200); } as shown in the image below.

NB: Cooldown to prevent repeated triggers

Step 11: Save your code. See the Getting Started section

Step 12: Select the Arduino board and port. See the Getting Started section

Step 13: Upload your code.

Step 14: Open the Serial Monitor (Tools > Serial Monitor) to view the output.

EXPLANATION

soundPin = 4; reads digital sound values from the sensor. threshold sets the sensitivity level for detection. digitalRead(soundPin) returns a value proportional to sound amplitude. When a loud sound occurs, the value spikes above the threshold.

CONCLUSION

This project helps learners understand how to interface with Sound Sensor using Arduino. It introduces essential concepts in electronic circuits and embedded system programming.