About this item

The SparkFun SEN-12642 Sound Detector is a compact and versatile audio sensing module designed to detect ambient sound and audio activity in a wide range of applications. Unlike a simple microphone, this sensor board combines an onboard microphone with signal processing circuitry to provide three separate outputs: envelope, gate, and audio. These outputs allow users to detect the presence of sound, analyze its intensity, and access raw audio signals simultaneously. The envelope output delivers an analog signal proportional to the volume of incoming sound, making it useful for audio level monitoring or visualization. The gate output provides a digital high/low signal when sound exceeds a set threshold—ideal for triggering events. The audio output gives direct access to the raw microphone signal for recording or frequency analysis. With a simple 3.3V–5V power supply and a small form factor, the SEN-12642 integrates easily with Arduino, Raspberry Pi, and other microcontrollers. It is perfect for projects like voice-activated systems, sound-activated lights, interactive installations, and environmental sound monitoring. This sensor provides a great balance of ease-of-use and advanced functionality for hobbyists, educators, and engineers.