Chee Kuok Yew, Farah Nabilah binti Zabani, Norazimah binti Abdulah and Mohd Rizal bin Manan
Keywords: Robot arm, 2 Degree of freedom, Microcontroller
Abstract: Writing is a sequence of letters, words or symbols marked on a surface. It is a medium for human to convey messages and thoughts. Writing is one of the four language skills which are reading, listening, speaking and writing that everyone learn at early age. Though, the disable people such as people who had lost their fingers to hold pen or old people with shaky hand are unable to write properly. As a solution, they will need a robot arm that can write for them. A robot arm for writing purpose is built to assist the disable who had difficulty in writing. It is a two degrees of freedom robot arm, with a programmed Arduino microcontroller to control the motion of the robot arm. There are three servo motor with two of them are rotating at vertical axis (the arm) and one of them is rotating at horizontal axis (the wrist). The robot arm is aimed to help people who can still write but slow or unclear when writing. So, the user need to key in the words with a keyboard. Once it is done, the microcontroller will read the input and execute the program. After that, the robot arm will start to write. When the robot arm finish writing, the arm will return back to initial position. Overall, the robotic arm has higher positioning accuracy to perform writing at paper segment three than paper segment one, two and four. Alphabet ‘O’ at paper segment two has the most position error among other alphabets.