I have a grblshield v3 (via Instructables in a ShapeOko kit). I let it sit for a few months (mostly unplugged), but when I went to fire it up again it isn't working properly:
* the Arduino starts up correctly, and I can access it via USB in the usual way
* grbl on the Arduino seems to be working properly -- '$' dumps settings, etc.
* entering commands does nothing, however (e.g. z-10 gets 'ok' but nothing happens)
* motors make no sound on power up; they used to...
* LED D1 on the grblshield is flashing (not solid)
I have verified that I am getting 24V and GND/V+ are connected properly. (Although if I measure voltage via the terminal block I get 0V even though the two leads report 23.62V when disconnected.)
Any assistance would be appreciated...