Research on the tracking of the slip area of a landslide using resistivity geoelectric method with Wenner configuration that aims to determine the subsurface structure which is alleged potential as the slip area has been done. Measurements took place in the Dusun II of Kalora Village, Subdistrict of Kinovaro, District of Sigi by taking three measurements trajectory. Based on the results of 2D modelling using software Res2Dinv for every trajectory obtained two layers, with the first layer of resistivity value ranges <500 Ωm identified as dry sand and the second layer resistivity values ranges> 500 Ωm that identified as a conglomerate rock. Based on the 2D cross-sectional area of research, which was thought as the field boundary slip was between 7-8 m depth on the path I with the West-East direction

Research has been conducted with the title of identification of weak zones in the Sigi Regency office area using geoelectric methods of resistivity. The study aims to analyze the perlapission of subsurface rocks and determine the distribution of weak zones. The measurements were made on 15 track using the Wenner Configuration. The data obtained is calculated using Microsoft Excel and processed using the Res2Dinv 3.53 program that produce a cross-section of 2D resistivity. The results showed that the weak zone had resistance values of 20-180 Ωm which were suspected to be clay and sand. This weak zone is characterized by a low resistivity value and contrasting a large resistivity value compared to surrounding rocks. This weak zone is detected in almost all measurement trajectories of varying depth and is mostly at a depth of ± 6 m. The weak zone spreads southwest of the research site

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%.

The experiment tool of converting angular velocity into linear velocity has been built to support the physics education in the Physics Department of Tadulako University. In this project, the experimental tool has been designed, manufactured, and tested to convert the angular velocity value to linear velocity based on Arduino ATMega 2560. The stages of this research begin with the design and manufacture: mechanical system, optical sensor circuit, stepper motor circuit, the circuit of LCD and keypad controlled by Arduino ATMega 2560. The next step is the building controlling program as the brain of this instrument. This experimental tool has been tested and working properly. It operates for a rotation speed range of 1 rpm - 112 rpm. The value of converted linear velocity both theoretically and measured value is relatively the same.

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