Design of Hearing Impairment Safety Helmet for Deaf People

Sensory disabilities, especially hearing disabilities, have a significant prevalence worldwide. In Indonesia, approximately 7.03% of people with disabilities are deaf. They face accessibility barriers in the use of private vehicles, especially motorcycles, due to the Driver's License requirement that requires hearing ability. To improve the mobility and safety of deaf people, research has been conducted that designs assistive devices to convert car horn sounds into vibrations. This research proposes designing a special helmet for deaf motorcyclists that can detect horns and the distance of other motorists on the highway. This helmet is designed to process the sound signal obtained from the sensor before entering the microcontroller, which will then produce an in the form of vibration through a vibrating motor. The signal processing process involves a non-inverting amplifier, bandpass filter, full-wave rectifier, and LPF envelope. Testing of the helmet was conducted involving five normal subjects who were conditioned as deaf. The test data showed that the accuracy of the ultrasonic sensor reading reached 90%, while the accuracy of the sound sensor reached 70%. And for the road testing the accuracy reaches 40%. This research aims to provide accessibility solutions for deaf motorcyclists, improve their quality of life, and provide a sense of security for other motorists. With this approach, it is hoped that deaf people can be more independent in using their personal vehicles. This assistive helmet innovation not only improves the mobility and safety of deaf riders, but also demonstrates a commitment to inclusion and accessibility in the transportation sector. This research is expected to be the foundation for further research so that it can be further developed so that it can work more adaptively to the environment and can be directly tested on deaf subjects.