This paper highlights our research towards development of a quadcopter to deliver postal mails and confidential letters from source to destination. The system consists of Unmanned Aerial Unit, Control System, Control Link and other Support equipment. The Unmanned Aerial Unit is controlled by the Control System which communicates with the Ground Control Station (GCS) via a control link that is Micro Air Vehicle (MAV) link. A GCS is a software application that communicates with the quadcopter via radio telemetry. The basic flight of the quadcopter all depends on the motor speed and direction. Motor speed is controlled by the Pulse Width Modulation (PWM) signal by changing the duty cycle as required. Inertial sensors are sensors that work on the principle of inertia. The inertial measurement unit consists of Accelerometer, magnetometer and gyroscope. These sensors are placed on the quadcopter to acquire current position and orientation along with a roll, yaw and pitch positions. The Ultrasonic sensor is also used in order to detect any obstacles in the desired path of the fly. As a result, the software application at the GCS will have a panel which will display all the information related to the quadcopter system. Global Positioning System (GPS) is used in order to decide the coordinates or the waypoints from source to destination. As a final product, the quadcopter flies autonomously from source to destination tracing the path all by itself using the GPS module placed on it. Another option of controlling the quadcopter by remote control is also possible.
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