Design of library noise detection tools based on voice pressure parameters

A library visitor would want a quiet atmosphere without noise when in the so that he can concentrate reading book. However, not all visitors come to read books; some chat and use free Wi-Fi or other, it disturbs concentration of other who books. Therefore, is necessary have tool detect sound pressure based on level produced limit library, namely 45-55 dB (desible). This designed microcontroller where definition complete microprocessor system contained chip which different from multi-purpose used PC because generally already includes minimum supporting components microprocessor, memory, programming. help officers monitor room for interfere with comfort visitors. Based results testing, overall as desired, including detection work an integrated system, sensor detects exceeds limit, buzzer will sound, red led light turns on, module issues voice message pre-recorded also device be controlled monitored web application.