This robotic arm was built using laser cut acrylic sheets. It is moved using 3 standard servo motors and a small one for the gripper. Unlike most robotic arms all heavy servo motors are in the base. This makes the upper part of the robotic arm lighter and thus requiring less power and looks more clean.
The servo motors are controlled using ServoDroid. ServoDroid is a tiny board that allows you to control motors and LEDs directly from your phone. With ServoDroid you can build Robots, camera mounts, Light activated lamps, and basically anything that contains a servo or LEDs. I created this board about a year ago and I'm now crowdfunding it on Indiegogo: https://www.indiegogo.com/projects/servodroid-control-anything-with-your-phone