Digital data recording of the geometry of 3-dimensional objects require a 3D scanner tool which are mostly using an imagery sensor. However there is hardly used information of scanned result, named color. Imagery sensor requires high spesification processing unit as capable as a personal computer for data acquisition processing. This research aims to build a 3D surface scanner using a time of flight laser ranging sensor and to develop its simple function to become more valuable device. Using point to point displacement method, the sensor measures the distance between the outermost point of the object and the sensor surface perpendicularly, once when one measurement is done then the object to be rotated along with the rotary table. The prototype was built using the VL53L0X sensor and ATMEGA8535 microcontroller as a motor controller for rotary table and vertical axis. Scanned data is sent from the microcontroller to the computer to be visualized in real time. The results show that the VL53L0X sensor is suitable for scanning convex objects but it is not capable to handle objects with multiple cavities.

Tachometer is an important tool for measuring the rotational speed of electro-mechanical machines and other rotating objects. In a closed-loop system, it should have a mechanism by which sensory instruments must be able to produce and deliver feedback values that can be fetched by the controller. Most commercial tachometers do not have such data communication features, making it difficult to be employed in closed loop systems. This study aims to develop a tachometer which is programmed using calculation on interrupt-based algorithm and has data communication capabilities as well. The algorithm was designed over the minimum features of a microcontroller chip, namely a timer and interrupt. The proposed algorithm that was tested on the prototype results good performance for the typical electro-mechanical machines with a measurement error range between 0.1 and 1.2%. The equation for the calculation of rotation per minute (rpm) has also been revised to provide a more valid formula.Abstrak-Tachometer menjadi alat yang penting untuk pengukuran kecepatan rotasi mesin elektro-mekanik dan juga obyek gerak lainnya. Pada sistem lup tertutup, secara teori wajib ada mekanisme dimana instrumen sensorik harus mampu menghasilkan dan mengirimkan nilai umpan balik yang dapat dibaca oleh kontroler. Sebagian besar tachometer komersil tidak memiliki fitur untuk komunikasi data, sehingga sulit digunakan dalam sistem lup tertutup. Penelitian ini bertujuan untuk membangun tachometer yang terprogram menggunakan algoritma kalkulasi interupsi dan memiliki kemampuan komunikasi data. Algoritma dirancang atas latar belakang fitur minimum sebuah chip mikrokontroler yaitu timer dan interupsi. Algoritma baru yang diuji-cobakan pada prototipe terbukti menghasilkan kinerja yang baik untuk rentang rotation per minute (rpm) pada tipikal mesin elektro-mekanik dengan error hasil pengukuran antara 0,1 sampai 1,2 %. Perumusan kalkulasi untuk perhitungan rpm juga telah direvisi sehingga menghasilkan formula yang lebih valid. Kata kunci-Tachometer digital, interupsi, komunikasi data

Abstract— The Meteorology, Climatology and Geophysics Agency (BMKG) predicts that the start of the rainy season in Indonesia will occur from September to November 2022 with the peak of the rainy season expected to occur in December 2022 and January 2023. The rainy season that will occur will certainly hamper the process of drying clothes and inefficient use of time because they have to lift clothes when it rains and dry them again when the rain stops. Another problem is when you are sleeping or traveling so it is not possible to remove your clothes when it is going to rain. As a result the clothes become damp or wet. The purpose of this research is to prevent damp/wet clothes again when it rains and to save time when lifting and drying clothes during the rainy season. The method used in this study is the Research and Development (R&D) method. It begins with reviewing previous research so that it can determine what hardware is needed, followed by making a flowchart then assembled into a prototype tool that is integrated with the Internet of Things (IoT). The test results show that this automatic clothesline can remove the clothes from the room automatically when the rain sensor and the LDR sensor detect rain indications such as cloudy and drizzling, and vice versa will put clothes in automatically when the weather is cloudy or raining. The stepper motor is coupled with a linear actuator which functions to move the clothesline in and out. There are sound notifications and email messages from Thinger.io when the clothesline has entered or left. The prototype is equipped with an emergency system so that it can insert and remove the clothesline when the sensor is damaged.

This study aims to develop and improve the capabilities of the Bellyra music player robot version 1.0. The development is carried out on several features including interface between user and robot was replaced using a TFT touchscreen which is proved more practical and the process of updating the library of songs is done by utilizing the service features of Google Sheets so that it becomes more flexible. The ability of the robot in terms of playing the melody of the song is improved by using alphabetical and symbolic codes that represent the melody and tempo of the song. The results showed that the Bellyra robot version 2.0 had been able to play the melody of the song properly for slow and medium rhythm nevertheless for faster melody could not be played properly due to the limited response of servo motor and unstable mechanical design.