Abstract: Road accidents in our country are increasing day by day. Most of the accidents occur due to not wearing helmet, which can cause severe head injuries or even fatality of the rider. So it is necessary to make it mandatory to wear helmet while riding on a bike. In this project I have made a prototype of smart helmet. It has an Infrared sensor inside the helmet, which will detect whether the rider is wearing helmet or not. The bike will not start until the rider will wear the helmet. There are two modules on is mounted on helmet and another is mounted on vehicle. Infrared sensor is attached with the helmet module and Microcontroller is attached to the vehicle module. These two modules will communicate wirelessly using Radio frequency transmitter and receiver with microcontroller.Keywords: Sensor, Infrared Sensor, Transmitter, Microcontroller.