Now insert the red power wire into the “+” terminal and
the black ground wire into the “
-
“ terminal
of the CNC
shield now. Be careful tightening this terminal down. You
want it snug enough that the wires don’t slide out, but if
you tighten it too much you will break it.
Insert the CNC Shield onto the Uno. It only goes one way.
Don’t force anything.
N
ow you’ll hook up the power and the cooling fan. Insert
the short red wire along with the red fan lead where the “+” is and the short black wire where
the “
-
“ is. It will probably help to twist the fan lead around the wire going in the same terminal.
These tighten down with a small screw on the adapter. Make sure you get enough of the
exposed wire in that socket so it doesn’t just slide out once you tighten it down. Watch for
strands of wire touching from black to red.
That’s a short, and it’s bad.
Check the connections, and check them
again. You are about to power things up.
Did you check?
Leave the motors unplugged, and plug up the
USB cable to the Uno board and to your
computer.
You will now configure the DRV8825
stepper drivers. You must have the USB
cable plugged into the Uno board right now
with the other end plugged into your
computer. You should ABSOLUTELY NOT
have your motors plugged in right now.
With that warning out of the way, plug the
power adapter into the barrel adapter you
just installed, then plug the power adapter
into the wall. It may take 3 to 6 seconds for
everything to kick on after you plug it in.
Set your multimeter to measure voltage. If
you don’t have an auto
-
ranging meter (if it’s
cheap, it’s probably not auto
-ranging), set
your meter to whatever is closest to 2 volts.
Depending on your meter, this could be “2V”
or “2000m” or “2.5V” or something different.
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