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The 4-pin sound sensor detects sound levels and provides both digital and analog output signals. It contains an electret microphone, amplifier circuit, and comparator. The analog output allows precise measurement of sound intensity, unlike the 3-pin version. The module is used in voice recognition, noise analysis, and interactive electronics. It is compatible with microcontrollers like Arduino, ESP32, and Raspberry Pi. The onboard potentiometer allows sensitivity adjustment. It is commonly used in smart home automation, voice-activated devices, and security alarms. The sensor helps in applications where real-time sound level monitoring is required. It is ideal for IoT-based projects requiring noise level analysis.