Rancang Bangun Audiometer Berbasis Mikrokontroler dengan Antarmuka Komputer

Kartini Sinaga, Suryono Suryono, Heri Sutanto

Abstract


For this research, an audiometer based on microcontroller with computer interface as a measuring instrument for the threshold of audible range has been designed. This device has some features, like graphic display, audio intensity display, and computer frequency.

This audiometer intended for the research consists of frequency generator, audio generator, and manual and automatic amplifying switch. The microcontroller is the main component which has the ability to be frequency generator using Fast PWM at timer 1 within 16bit resolution and crystal value 16MHz so that the frequencies at 250 Hz, 500 Hz, 1000 Hz, 2000 Hz, 4000 Hz, and 8000 Hz can be generated precisely and steadily.

The maximum audio intensity as the result of this research using the device was 46,2 dB. The result of the frequency test on the device designed for this research has the linear correlation coefficient R=1, meanwhile the audio intensity measured at the standardized device has the linear correlation coefficient R=0,997

Keywords: microcontroller, sound level meter, multi-tester, frequency, audio intensity


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