On the internet only two types of arms are available either hydraulic which is controlled manually or robotic which is controlled using app or some other thing. This project is the combination of both of them.Before you start make sure you have some arduino coding knowledge.
connect the hc05 with the arduino in this way.
this is the l298 motor driver [ena, in1, in2- motor A], [enb, in3, in4- motor B], ena & enb are for speed control of motor A and motor B.
I have provided a detailed explanation of the code, follow the code and make the circuit. Before switching on the power supply please make sure that you have grounded all the components properly.