The evolution of Information Technology (IT) has enabled the development of an electronic voting system involving festival visitors as voters. Electronic voting (e-voting) is the application of voting that refers to the use of information technology. The use of android smartphone for e-voting can be an option, because it already combines computer and internet network in one single device. The android smartphone has a device id that can be enabled to avoid multiple voters. Restrictions on the distance or radius of voters to festivals are allowed to vote, using Location Based Service (LBS) technology from GPS smartphone voters. But the number generated by LBS is still the number of coordinates in the form of latitude and longitude, then it takes a conversion to change the coordinates into distances or radius in meters. One method of converting coordinates into distances can use Haversine formulas. Implementation of e-voting is made in the form of android application. Stage as the center point of coordinates. Visitors at a distance or radius determined by the committee are counted as voters. The voters who are outside the radius that has been determined by the committee not as a voter. Therefore, limiting the radius of the voters to the Haversine formula can be applied to e-voting.

Motorized accidents on many motorways are caused by sudden braking. Sudden braking occurs because of the distance between the driver and the obstacles in front that are too short, and the driving speed is too high, there is a delay in braking and a surge of force. Supposedly, vehicle motion when braking occurs must comply with the physics principle of following the kinematics concept of non-uniform motion slowing down between the driver with obstacles in front, and the concept of non-uniform circular motion slowing down on the wheels of a motorized vehicle. For this reason, an automatic braking instrumentation system is created using the principle of non-uniform motion slowing down and nonuniform circular motion slowing down, with distance and speed variables obtained from the proximity sensor and the speed sensor mounted on a motorized vehicle. The study began by conducting the first is characterization of the braking system of a motorcycle engine as a whole. Next, conducting a literature study from information obtained in the field. Next, conducting an appropriate braking control system study. Next, braking control system manufacturing and modeling mathematical as well as applications on motorbike vehicles. Next, tests are carried out in open fields and on the road starting from the engine starting the engine and moving forward until it stops again after braking. The braking control system development approach that is being carried out is the application of digital technology by balancing the needs of motorcyclists. This is done so that there is no gap between the needs of motorcyclists and the technology applied. In general, the technology applied includes the main parts, the controller unit as microcontroller, distance measuring unit use ultrasonic sensor, and speed sensor use hall effect sensor, servo as mechanical drive automatic brakes, and battery as power source. The units were developed according to the real conditions, and from the results of measurements of the effect of distance to deceleration by 93 percent.

Measurement of flow rate in wastewater pipes is still challenging to be done in real-time. The main challenge in wastewater measurement is the non-homogeneity of wastewater due to the presence of solid waste material. This becomes a hindrance when using mechanical flow measurement or direct contact between the fluid and the measuring device. Therefore, the solution is to perform non-contact flow measurement between the fluid and the measuring device. In this study, a flow sensor was developed for a horizontal pipe using the cross-sectional area measurement method on a horizontal pipe measured by an ultrasonic sensor as the fluid level measuring device. The ultrasonic sensor can measure the height of the fluid level, allowing the flow velocity and cross-sectional area of the horizontal pipe to be determined. The basis of this measurement is that any flowing fluid in a pipe that experiences a change in velocity will also experience a change in volume or fluid level. This measurement is in accordance with the continuity equation. From the calibration results, an error of 1.7% was obtained for the height measurement from the ultrasonic sensor compared to the ruler used as a height calibration tool. Meanwhile, the error in the flow velocity measurement from the ultrasonic sensor compared to the calibration results using the tracker software was 4.2%. The error in volume measurement from the ultrasonic sensor compared to the standard measuring tool, a 5-liter beaker glass, was 0.8%. As a conclusion, flow rate measurement using the ultrasonic sensor with the cross-sectional area measurement method can be used to measure the flow rate in a horizontal pipe with a diameter of 11 cm.

Mass measuring devices have been developed by various methods. In its design, gauge the mass of the object to be adjusted in good measure the reach and shape. This corresponds to a sensitivity that can be generated by the mass measurement. One of the transducers for the measurement of mass that can detect small mass changes are the strain gage. In the making mass sensor using a strain gage type uniaxial with 120 ohm resistance and cantilever beam with a length of 2 cm, width 1 cm, thickness of 20μm that utilizes the deflection of the beam surface. The existence of deflection caused by the addition of mass at one end of the beam. Calibrated using the masses as loading balance brand ohaus Pioneer™ type PA214. Deflection that occurs detected a strain by strain gage transducers mounted on the cantilever surface. Through electronic wheatstone bridge circuit, the characteristic equation obtained by measuring the mass of the prototype instrument that states the relationship between voltage, V in millivolts, and the mass, m in grams, is V = -3.36667 m + 38.49556. This research will also be carried out data acquisition system to a PC to be stored in a database.

Rice is a staple food in many cultures. Instead, rice is a staple food for about half of the world’s population. Some studies show that white rice consumption contributes greatly to the development of type 2 diabetes. Type-2 and type-1 diabetes is caused by obesity which requires tracking carbohydrate intake accurately. Especially in Indonesia, the calculation of the Carbohydrate Adequacy Number (CAN) refers to the regulation of the Minister of Health of the Republic of Indonesia Number 75 of 2013 concerning Recommended Dietary Allowances (RDA). To fulfill daily consumption needs of carbohydrates so as not to overdo it, in this study rice dispensers were made to be able to regulate rice consumption needs according to the daily Carbohydrate Adequacy Number (CAN). Rice Dispenser is made using hardware from four half-bridge load cells, HX711 as ADC module, microcontroller NodeMCU and ESP8266 which functions as data communication via WiFi that is connected to online software. On the server side as monitoring and control in consuming rice every day is regulated through the application in real time. From the results of testing both hardware and software, rice dispensers that have been made can work well. The remote control also functions well and in measuring the mass of rice, rice dispensers can measure accurately. Likewise, when removing rice from a rice dispenser it works automatically and is scheduled by setting on the server side. As for testing, the average error values obtained from the measurement results obtained are 1.45 and 6.6.