http://blogpower.cl/original-diy-5dof-robot-five-fingers-metal-manipulator-arm-left-and-right-hand-qds-1601/ https://www.youtube.com/watch?v=SezlXyI3pxE http://blogpower.cl/original-diy-5dof-robot-five-fingers-metal-manipulator-arm-left-and-right-hand-qds-1601/ https://howtomechatronics.com/tutorials/arduino/diy-arduino-robot-arm-with-smartphone-control/