Design Automatic Dispenser for Blind People based on Arduino Mega using DS18B20 Temperature Sensor

People with visual disabilities, who have limited vision, will experience many obstacles in carrying out activities and social interaction. Equipment, in general, is not still user friendly for blind people. The purpose of this study was to create an automatic dispenser design that provides convenience and safety for visually impaired people when taking hot water to the dispenser. This study uses Arduino Mega microcontroller as the main control, proximity sensor to detect the presence of glass, and the HC-SR04 ultrasonic sensor as a determinant of high water levels and an SD Card Module to play sound. This research uses the Research and Development (RnD) method. The results of this study are an automatic dispenser that can fill glasses automatically with a glass height of 8 cm, 10 cm, and 12 cm. This dispenser can automatically tell blind people when the glass is full and turn off the tap when the water reaches 1-2 cm from the surface of the glass so that the water in the glass does not spill. Based on the test results, this automatic dispenser can detect glass of any color and make it from melamine, plastic ceramic, iron. However, this automatic dispenser cannot detect glass made of glass and transparent colored glass. When going to use hot water, blind people can choose a temperature with a setpoint of $50^{\circ}\mathrm{C}, 70^{\circ}\mathrm{C}, 80^{\circ}\mathrm{C}$. The results of testing the tool using hot water show that the temperature of the water in the glass has a difference of $1^{\circ}\mathrm{C}-3^{\circ}\mathrm{C}$ with a setpoint.