Quadcopter Stability Increased by PID Adaptive Tuning

Today's World is getting more efficient in mail deliveries or other applications using autonomous vehicles as drones because of their improved performances. The quadcopter appertains to the drone family having the advantage of flying stability light weight and accurate maneuverability. This paper describes the design and the adaptive tuning for dynamic control of a quadcopter using PID control technique. The experimental tests show improved response related to the previous results under the same input condition

X-Y Pen Plotter Design Accomplished from Older Drives

The paper describes the design and the implementation of a small, easily operable and flexible 2-axis CNC pen plotter (Computer Numerical Control). It is accomplished from two old and available CD-ROM (Compact Disc Read-Only Memory) drives using their stepper motors and the main hardware structure. The two stepper motors move the pen platform along X and Y axis. The plotter has been tested for printing different images and texts. Thus, the functional and graphical requirements were demonstrated, the conclusion being that this device is efficient and precise, and it can be easily achieved from available components