Analog Sound Sensor Microphone Module for Arduino

What this module is

The Analog Sound Sensor Module is a microphone-based sensor used to detect sound intensity (loudness).

Important:

• It does NOT record audio

• It only measures how loud the sound is

Working Principle

• Uses an electret microphone

• Converts sound electrical signal

• Amplifier boosts signal

• Outputs analog voltage based on sound level

Output voltage changes with sound intensity

Key Specifications

• Operating Voltage: 3.3V 5V

• Output Type: Analog (A0), sometimes Digital (D0)

• Sensitivity: Adjustable via potentiometer

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  Frequency Range: ~16 Hz 20 kHz (human hearing range)

Pinout

3-pin / 4-pin versions:

• VCC 3.3V / 5V

• GND Ground

• AO (Analog Output) Analog pin

• DO (Digital Output) Digital pin (optional)

Output Types (VERY IMPORTANT)

Analog Output (AO)

• Gives real-time sound level values

• Used for:

  • Sound graphs

  • Noise measurement

Digital Output (DO)

• HIGH/LOW based on threshold

• Used for:

  • Clap detection

  • Sound trigger systems

Applications

• Clap switch (turn ON/OFF light)

• Music reactive LEDs

• Voice-triggered robotics

Important Notes (very important)

• Cannot measure exact decibels (dB) accurately

• Cannot record or process audio

• Output is noisy and fluctuating (normal behavior)

• Needs filtering in code for stable readings

Real-world issue:

• Values don't change much normal for cheap modules (low amplification)

Types of Sound Sensors