E. J. Talabani, Rawand, and روندإحسان. 2009. “Displacement Detection Application of HDNS A2051 Optical Sensor for Controlling a 4-DOF Cylindrical Manipulator”. Al-Rafidain Engineering Journal (AREJ) 17 (6):53-66. https://doi.org/10.33899/rengj.2009.43602.