This paper demonstrates the real time obstacle detection using ultrasonic sensor onarduinouno board in micro aerial vehicle (MAV). Ultrasonic sensor (HC-SR04) is used to measure the distance of an object (Prashanth et al., 2013). An algorithm is developed for obstacle detection, which is embedded on an Arduinouno that acts as control board. Four ultrasonic sensors are placed in all the directions. The four green LEDs and four red LEDs are interfaced to arduino board through jumper wires. Obstacle is considered with different colors and the ultrasonic sensor was fixed at a point. Measurements are marked upto 4 m as the range of ultrasonic is 400 cm. It is connected to the laptop containing arduino IDE software. Obstacle distance is considered with two colors it shows how a color is varying with different distance when obstacle present. Green LED indicates when obstacle is detected from an ultrasonic sensor for larger distance between 30-40 cm. Red LED for lesser range upto 20 cm when sensor detects the obstacle and the corresponding sensor will be activated and blinks the LED. It is concluded that the algorithm implemented is useful in obstacle detection for mini aircraft applications (Jeffery, 2005).
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