The work princip of the relay is simple. When current
flows between pins X and Y, it leads to the creation of a
magentic field. The influence of the magnetic field causes
a change in the position of the switch inside the relay.
Control signals from microcontroller are sent to the
controlling element. Those control signals need to enable
the flow of current which is necessary to trigger the DC
motors placed inside the joints of the robotic arm. The
system is operated from the client's computer GUI.