Robotic arm 3 DOF V1

The robot uses three 5V 28byj-48 stepper motors, one for each degree of freedom. The gripper is made for 20x20x20 XYZ calibration cubes The SG90 is used for the two finger gripper. It's circuitry is removed so it's controlled as a DC motor, not a servo! I used the Arduino Pro Micro, though you can use other microcontrollers that have 14 or more digital I/O pins. Four are needed for each stepper motor if your using the ULN2003 drivers that come with the 28byj-48. The last two are for the DC motor on the end effector. I used the L293D driver IC, although it is a bit outdated. ~6 volt power source is required due to the voltage drop that occurs (1v on the ULN2003 and 1.5v-2.5v on the L293). I used a USB-C trigger (for fast charging) and a DC-DC step-down (buck) converter. Only one of each part needs to be printed. Non printed parts: 28BYJ-48 stepper motor x3 SG90 modified to DC x1 Main bearing - 6806 x1 Arm bearing - 693