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A project log for Single Axis Step Motor Controller/Driver Board

A Complete Step Motor Controller and Driver Board

bharbourBharbour 06/18/2020 at 21:330 Comments

The Theta Axis project that I designed this board for is going to be a close fit to get everything into. In the interest of easy assembly, I built up another one of these boards, but instead of the little 2.54mm screw cage terminal strips for the power, motor and home switch, I put 2.54mm Molex Cgrid III connectors in. I have a crimper for the pins for that line of connectors and they work well for applications like this. Another advantage to these connectors is that there is no side access required for assembly, just push the connector onto the pins and go.

The new board built up with no problems. The only issue that I had when I powered it up is that I had the EEProm write protect pull up resistor populated and the firmware complained about not being able to write the EEProm. I pulled the resistor and all was well. I made the same mistake on the first board and marked the electronic copy of the schematic but forgot to mark the hardcopy of the schematic. That is fixed now.

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