simple robot arm using pro mini and joystick

A simple robot arm project to get my 4 year old son introduced to making his own toys. Have promised him a Predator style laser gun and this will be mounted on his wrist as a grabbing tool :-)

Couldn't find much material on joystick for 4DOF robot control and so had to sped quite a bit of time with the code.

Haven't got enough options on the joystick for all 4DOF and so have limited to forward-backward, left-right & grip actions.

Happy to answer any questions :-)