A Microcontroller-Based Sonometer

Abstract

It has been designed and made a sonometer device that uses a microcontroller and LM567 frequency sensor module. The sound from the sonometer strings is detected by the module sensor. If the module sensor detects that the string sound frequency is the same as the tuning fork frequency, the microcontroller will display the word “Sesuai” on the monitor screen (LCD) which means the string frequency is equal to the tuning fork frequency. Conversely, if the frequency of the strings sound is not the same as the frequency of the tuning fork, the microcontroller will display the word “T Sesuai” which means the frequency of the strings is not the same as the tuning fork frequency. Compared to the conventional sonometer, this sonometer (the modified sonometer) produces more accurate frequency values. In this study, the maximum relative error of the modified sonometer is 0.30% while the maximum relative error of conventional sonometer is 10.86%.