RobotArm - Longer Arm

This is remix of [thing:1718984](/thing:1718984). It is modified to have longer arm. Only the modified models are uploaded here, others you can download from original design. Instructions to build it is same as original one.

This robotic arm is used in a project of robotic chess game development, see this demo video https://youtu.be/buljrHbHwn0

this is the gripper [thing:4394894](/thing:4394894) to grep a chess piece

Arduino code is [here](https://github.com/hkucs-makerlab/robotArm).

You can download the app source code, it is here https://github.com/wyh5625/ChessboticApp, welcome to improve it and share to the public. For any questions, you may contact the student.