In this project we are using Ultrasonic and IR (infrared) sensors for obstacle detection and hole, steps
identification. For that we have written an assembly language code we are using the Interrupts. In the code we
have written that when accelerometer is in active mode if we get any IR or Ultrasonic sensors are active all the
current processes are going to be stop i.e. if any direction we are getting from accelerometer are could not
execute. So in these way we can identify any obstacle or steps, holes in the way of wheelchair.