This project shows you how to construct a PCB drill machine driven by a master-controller board and three stepper motor driver boards. These four single sided PC boards each contain an Atmega16/32 microcontroller. Communication between the boards is performed using the RS485 protocol with all communication initiated by the master-controller. The PCB drill machine firmware is completely written in Bascom-AVR.
A stepper motor driver-board is an autonomic device. It gets a command from the master-controller-board and it takes care of the stepper motor motion, error-detection and error-correction. The initiative of communication on the RS485 bus is at the master-controller-board. It submits the stepper motor commands and will wait until the commands are done. This PCB drill machine project is designed by Ben Zijlstra, Theo Kleijn, and Ad Boogers.