Sound detection module — compact 40 x 15 mm microphone board with low noise, fixed 20 dB gain, and adjustable threshold. Ready for immediate prototyping with Arduino and other 5 V microcontroller systems. Key benefits Compact, lownoise design: 40 x 15 mm microphone module provides clear sound detection while minimizing background noise for reliable signal detection. Consistent, fixed gain: Builtin 20 dB gain ensures stable sensitivity across projects, reducing the need for external amplification. Accurate triggering control: Onboard potentiometer lets you set a precise threshold so the module outputs a clean digital /LOW signal only when the sound level meets your set point. Plugandplay compatibility: Standardized pin layout and 5 V operation make it easy to connect to Arduino boards and other common microcontrollers for rapid prototyping. Fast adjustments without disassembly: Builtin sensitivity control knob enables quick tuning on the workbench or in the field. What it does (function and performance) Detects small sounds and converts them to a digital output (/LOW) when the input exceeds the adjustable threshold. Low module noise and fixed 20 dB gain deliver consistent detection performance in a variety of environments. Operates from a 5 V power supply common to microcontroller projects. Compatibility and physical details Size: 40 x 15 mm compact form factor for tight installations and breadboard or shield use. Power: 5 V supply. Outputs: Digital /LOW output for triggering logiclevel inputs on microcontrollers. Connections: Standard pin layout for easy wiring to Arduino and similar systems. Adjustments: Onboard potentiometer / sensitivity knob for threshold calibration. Practical applications (realworld scenarios) Robotics: Use as a soundtrigger input to detect claps, knocks, or other acoustic events that control robot actions or state changes. DIY alarms and automation: Trigger alarms, lights, or relays when a preset sound level is reached (door knock sensor, noiseactivated light). Education and prototyping: Teach signal detection and thresholding concepts or rapidly test audiotriggered logic in classroom labs and maker projects. Why choose this module Saves development time with plugandplay wiring and an easytoadjust sensitivity control. Produces consistent results thanks to the fixed 20 dB gain and lownoise microphone module. Works directly with widely used 5 V microcontrollers and Arduino boards for immediate integration into your projects.