RANCANG BANGUN ALAT BANTU JALAN TUNANETRA BERBASIS INTERNET OF THINGS

Research has been conducted related to the design of an Internet of Things (IoT)-based blind walker with the aim of facilitating blind people in carrying out their daily activities. This research was conducted through several stages, namely a literature study, hardware and software design, sensor calibration, and system testing. The blind walker system uses ultrasonic sensors that can detect objects; infrared GP2Y0A21 detects holes; water level detects puddles and water depth; and the use of GPS to find out the location of the blind can be accessed on a smartphone through the Blynk application. The use of the Arduino Mega 2560 as a microcontroller and the ESP8266-01 wifi module to transmit data The system obtained average data of HCSR-04 ultrasonic sensor calibration results of 99.96%, water level of 99.39%, infrared GP2Y0A21 of 98.5%, and GPS with latitude error of 0,0014030% and longitude of 0,0000761%. The system test results show that the HCSR-04 ultrasonic sensor can detect objects at a distance of <=50 cm with the speaker output issuing a "beware of bumping" sound, while at a distance of <=100 cm, the buzzer sounds once. To detect if there is a puddle of water, a water level sensor is used so that the speaker sounds "watch out for puddles". Meanwhile, to detect if there is a hole, the GP2Y0A21 infrared sensor is used at a hole depth of 10–80 cm. The test results above show that the blind walker system works well.