Discrete Distance and Water Pit Indicator using AVR ATmega8 in Electronic Travel Aid for Blind

Abstract

The present electronic travel aid device consist usually available ultrasonic sensor to detect obstacles on the way within a distance of two to three meters. It transmits ultrasound beams at a regular time interval. If any object is present on the way, the emitted ultrasound will be reflected back to the sensor. The discrete distance of the object is then measured according to discrete levels of 1, 2 and 3 meter and sensed by tactile vibrators. In addition to this, device is to give information about water pits in the traveling path which is sensed by audio signal.