Design and Manufacture of Anti-Earthquake Filter Based on ATmega32 Mikrocontroller

• Main Author: IMAN HENDRIYANTO (NIM 13103056), TEGUH
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/9465
• Institution: Institut Teknologi Bandung

Earthquake usually becomes a problem to some industries that operate on an earthquake sensitive area. This natural phenomenon disturb the industry's vibration monitoring system, where vibration signal due to eathquake are read as machinary vibration. This will caused the machine operation to be automatically stopped or tripped. PLTP Gunung Salak, owned by PT. Indonesia Power as facing the same problem involving earthquake. To overcome this problem, analog High Pass Filter (HPF) can be used, but this kind of filter needs some amount of settling time to become steady, in which signal become fully filtered. The amount of settling time is long enough for the vibration monitoring system to read the earthquake signal and causing the machine to be tripped. This research involves of designing and manufacturing a microcontroller based filter named anti-earthquake filter. This filter is designed to have 12 analog input and output channels. The hardware is mainly constructed of a signal conditioning circuit, which functioned to cut the input signal at the trip value of the machine (380 mV). The software consists of a program which calculate Fourier series so it can eliminate an earthquake signal with frequency value of 4 Hz. Beside that, the program is also built in such a way so that if the machine's vibration is big, then the filter will automatically bypass the input signal into the output channel. The hardware testing results show that the signal conditioning circuit has succesfully cut the input signal at 374.465 mV. The mikrocontroller program testing is done by comparing the calculation results of microcontroller calculation and MATLAB simulation. Based on these two results, it can be concluded that these two processes produce a similar result with maximum difference of 8.578 mV. The program has also been able to eliminate an 4 Hz earthquake signal. <br />