Teachers build hazard detectors

A schoolteacher in Telangana has built low-cost wearable hazard detectors that turn traffic noise into vibrations or lights for people with hearing loss. (timesofindia.indiatimes.com) The devices were developed by Shaik Rajalipasha, a government school teacher from the Khammam area who is himself hearing-impaired. In a 2025 report, The Times of India said his latest version was a smart cap that vibrates when it detects sound above 75 decibels. (timesofindia.indiatimes.com) The cap uses a small microphone, a circuit and a vibration motor powered by a small battery. Rajalipasha said it could alert users on roads, at railway crossings, and in factories or construction sites where sirens are used. (timesofindia.indiatimes.com) He had already built a smart helmet for two-wheeler riders in 2023. Telangana Today reported that the helmet lights up at the front when a vehicle behind honks, giving the rider a visual cue to check mirrors and make way. (telanganatoday.com) Rajalipasha told Telangana Today he started work on the helmet in 2021 after a hearing-impaired friend died in a road crash and after he injured his own hand in a 2018 accident. He said the build took nearly two years and about 50 electronic-device trials to make fully functional. (telanganatoday.com) These devices fit into a broader category called assistive technology, which includes tools that replace sound alerts with vibrations or flashing lights. The United States National Institute on Deafness and Other Communication Disorders says alerting devices are designed to signal events like alarms, phones or other warnings to people with hearing loss. (nidcd.nih.gov) Telangana has been trying to build that sector around local inventors as well as companies. The Telangana State Innovation Cell said its Assistive Technology Summit was created to make affordable assistive technology more accessible and to connect researchers, innovators, investors, social enterprises and government bodies. (teamtsic.telangana.gov.in) India also has a national subsidy route for certified aids and appliances. The Department of Empowerment of Persons with Disabilities says its Assistance to Persons with Disabilities for Purchase or Fitting of Aids and Appliances scheme was revised from September 26, 2024 and runs through March 31, 2026. (depwd.gov.in) Rajalipasha’s work has already moved beyond a classroom project. The New Indian Express reported in November 2023 that the Telangana State Innovation Cell picked his helmet for the People’s Festival of Innovations in New Delhi, putting a teacher-built road-safety device on a national stage. (newindianexpress.com) His next step, according to The Times of India, is to seek a patent for the smart cap and then distribute units free to hearing- and speech-impaired people in his area. That would keep the project focused on the same problem it started with: giving users a physical warning when the road is making a sound they cannot hear. (timesofindia.indiatimes.com)