As transportation technology develops, the vehicles used for these activities are getting faster. Driving at high speed can increase the risk of accidents and the risk of traffic accidents for the driver. As an anticipatory step from the impact of a more severe accident, the authors design and implement an accident detection system that will provide SMS in the form of vehicle location data and vehicle details to the family of the accident victim when the system detects an accident The system built uses Arduino UNO components as the controller, accelerometer sensor MPU6050 as accident detection sensor, NEO6MV2 GPS Module as vehicle location module and SIM800L Module as SMS notification sending module. The system was built using Arduino IDE as an application program. The Accelerometer Sensor has a good system stability with a standard deviation of 0.024. The GPS sensor has a lock time that is quite fast and less than 3 minutes with good lock time stability. The GSM SIM800L module has a fairly good delivery delay with the largest delay of 3.95 seconds and the fastest delivery delay of 2.16 seconds. For further development of the tools that have been made, it is necessary to use better hardware so that the system's work performance can be better. It has a shorter GPS lock time and a shorter delay in sending SMS notifications.

The rapid development of technology and the high level of human innovation have led to the emergence of sophisticated technology products, one of which is Arduino, a microcontroller system that has been integrated with various electronic modules and using C ++ programming language, automatic smarthome control system, is one of the technological advancements in the field mechanics and electronics both digital and analog, by integrating smartphones as a remote to turn on and turn off certain electrical equipment by using Arduino as main control, and Esp 32 as a link between smartphone and Arduino using wifi technology, and smarthome remote application as a user interface media to give orders through smartphones that will be executed by Arduino and then relays that will execute electrical equipment installed at home.

This paper proposes the cogging torque reduction by using the optimization of the slotting method on the stator and the cutting edge of the rotor side magnet of the Permanent Magnet Machiene (PMM), of the Synchrounous Generator (PMSG). Here, the effect on the cross-sectional area of the magnetic poles and the additional width of the slot opening will lead to an improvement in the reduction of cogging torque for the investigated of the machine. The proposed machine has 6 poles and 18 slots with a fixed slot opening widths on the stator and modified magnetic poles on the rotor. The software used to investigate and analyze the saturation of the induced cores in the stator and rotor of machine is the magnetic finite element method (FEMM 4.2). The most cost-effective method to minimize the presence of cogging torque of any PMSG is to conduct the modification of the rotor where the magnets are located and modify the stator structure despite the complexity and cost of manufacturing the stator. Here, the cutting of magnetic edge structure using a simple cutting method is implemented. This is a different method from that already widely implemented for cutting the edge of the magnet surface. The simulation results show that the PMSG cogging torque by cutting the magnetic edge and adding a dummy slot can significantly minimize the cogging torque. It is found that the cogging torque reduction is 99.47 percent. This condition as the low cogging torque and low PMG speed can be used for reference design and PMSG construction for renewable energy plants such as in geothermal power plants.

Stadium is the venue for sport activities like football, athletics, and and also be used for opening and ceremonial venue, and music concerts. The application of stadium roof is needed to anticipate unpredictable weather conditions that can hinder the running event. The stadium prototipe are made by using an electrical actuator in the form of a servo motor. The prototype have 3 input sensors in the form of LDR sensor, water level sensor, and DHT11 sensor, which function for read a weather condition around the stadium and for output using mini roof programmed using NodeMCU. Analysis of roof stadium performance testing is carried out with variables and parameters, and the test include the water level sensor test in reading weather conditions, servo motion test, DHT 11 sensor test to read temperature and humidity, and LDR sensor test to read conditions in the stadium. In the water level sensor test and the LDR sensor test there is no error. In the DHT11 sensor test error was found 0,6% for temperature reading and 1,9% error for humidity reading. In the servo motion test average success is 98,1% for first servo and 96,8% for second servo.

In the use of power plants that produce DC voltage, such as Solar panels (PLTS), Wind Power Plants (PLTB), Micro Hydro Power Plants (PLTMH), and others. Inverter is an important tool, inverter is a tool used to convert DC voltage into AC. The Modified Sine Wave Inverter is a type of inverter that produces a modified square wave. The design is done by connecting the inverter input to the battery and then connecting the jack to the inverter output so that the load being tested can be easily replaced with another output load, which is displayed by an oscilloscope of the form modified wave. The results of the research using this inverter produce the highest efficiency at an inductive load of 58.92% at a Blender load and the lowest efficiency of 1.67% at a 5 watt load.