It's a GRBL CNC controller that's tiny enough to connect to the db25 port directly. What motivated you to create it? For my CNC machines, I needed a better, cheaper, and smaller BRBLsolution. A male/female, straight or 90deg dp25 connection may be attached to the board, depending on the orientation needed... It also offers a full-size USB port for a more secure connection. grbl1.1f
Try it out today!