The first step in making the entire system work is to test the motors. Fortunately, the GitHub site, https://github.com/JJulio/AHRobot, has the code that can make this happen. Download and unzip the code. Look in the
AHRobot-master/Arduino/Utils/AHR_Motor_Test directory for the
AHR_Motor_Test.ino program file. This file provides a simple test program to move the three stepper motors, first the x-axis stepper motor that moves the paddle back and forth across the table and then the y-axis stepper motors, the two motors which move the paddle forward and backward.
If you are unfamiliar with how to develop and upload code for Arduino Mega, go to the https://www.arduino.cc/ website. It has a detailed set of instructions ...