Drawing robotic arm

Abstract: A drawing robot requires precise steering and high accuracy.The purpose with this project is to design a roboticarm with 3-dof that can be fed with a gray scale picture anddraw it on a paper. This thesis investigates which drawingtechnique that fits better for the robot, which controller isthe most suitable and what accuracy is achieved with thechosen controller. During the project a drawing robot iscreated and two different controllers are implemented andtested PD and PID. The implementation shows that PDcontrol is not working for this application. Therefore, PIDcontrol is the most suitable. Experiments are set up tomeasure the drawing accuracy using the PID-controller. Adrawing accuracy of ±11mm is achieved by the robot. Theachieved accuracy is a result depending on several factors,for instance the resolution of the potentiometers.