How to Build a Robotic Arm: update: https://www.youtube.com/watch?v=BILiuqRmLRI want to build the controller go to here the video's: http://www.youtube.com/watch?v=N9z7OQLlhrE http://www.youtube.com/watch?v=jozshuI246o&feature=youtu.be http://www.youtube.com/watch?…