I was building my new tiny, tiny CNC mill and discovered a problem.
Everything was working apart from the spindle.
As you can imagine, that was a little irritating as the spindle is kinda important to the whole operation.
Turned out after some arduino tinkering, the shield has the wrong pin connections.
You see, it seems around version 0.9 the Spindle PWM pin had a change.
My GRBL firmware was sending PWM to pin 11. The shield pin though was NOT connected to that pin.
Thankfully, with a little Arduino search I can change the pin allocation, or I can just solder the pin directly.
Lesson here though - hardware dependent on certain pin allocations causes obsolescence problems. Not sure how many customers would have been completely stymied with this issue. Especially considering this particular CNC kit comes with zero instructions ...
