Ok today we're gonna learn how to install a 1/32 step stepper so we have
our x-axis our y-axis our z-axis our E0-axis and our E1-axis so what we're
gonna do is we're gonna set up the MS pins these are micro step pins we have
my kristef 1 2 & 3 and what we need to do is jump them all for the highest
degree of step if you want further detail on this my previous video covers
it in great detail but in this case we're just going to shorten it a little
and put these jumpers on in a moment I'll explain the DRV8825 and how it
works so hang on okay this is a fresh
DRV8825 I'm going to open it up here for you and the inside we have two parts
that come with it we have the driver board and then we have the heat sink now
the heat sink will be placed on the chip to cool it we also have a potentiometer
here that we're gonna use to adjust possibly in the future the actual
current that comes out but for now we're gonna stick to the default value that
it's set to so I'm gonna show you how to put on the heat sink what we want to do
is peel off the sticker holder you just place that on there avoiding touching
any metal if you can in a moment I'll show you actually the pin that we want
to keep track of
okay this is the underside of the DRV8825 and what we're looking for is
this pin right here which is the, "EN" or Enable pin so in a moment I'm going to
show you how to connect it to the RAMPS board okay now that we're looking at the
RAMPS board I'm going to show you the x-axis that the stepper is gonna be
right here and the pin that we're trying to find is the, "EN", pin which is right
here so this is the pin that we want to line up the pin from the bottom of the
DRV8825 so in a moment I'll show you how to connect it okay to connect it
we know the, "EN" pin is right here so we just flip it over and line it up and
then apply a little bit of thumb pressure in the moment I'll show you
what we need to connect to test it and then we'll load the firmware and go from
there okay to connect it what we need to do is connect the four pins for the NEMA
17 right here on the x pins next we need to connect the end stop sensor so I've
gone over this several times before so I'm going to be kind of brief so what
I've done is I've actually connected the stepper right there for the x-min access
and what we're going to do in a moment is connect the USB and load the firmware
okay in a moment we're gonna load the actual firmware but we have to connect
the serial USB first so the big end over here and the small end into the computer
and you'll hear a beep in a moment I'll show you how to load the Marlin firmware
okay we're gonna open up the Marlin 1.1.8 folder we're gonna go to the Marlin
folder we're gonna hit, 'm', on the keyboard we're gonna scroll down to
"Marlin.ino", we're gonna hit enter okay we're gonna go over to the
"configuration.h", tab we're gonna do a find on, "default_access_steps_per_unit", we're then going to look
at the values here now normally when we use the other stepper driver we left
these as default but because it's not 1/16 a step its 1/32 what we have to do
is change the 80 to a 160 and the 80 to a 160 if we were to use other axis but
seeing how we're not using other axis we're not gonna worry about it so we're
only gonna do the X because that's what we're working on and keep in mind these
values can vary and you need to use the RepRap calculator to figure out what
your default values will be so in a moment we're gonna load the actual
firmware on the RAMPS but let's double check something here we have a port
selected we have the Arduino selected so we're gonna do a compile and upload
now what we're gonna do is to test the power from the power supply this is a 12
volt power supply so we're going to attach the connector for the RAMPS board
then we're going to plug it in and in a moment we're gonna open up Pronterface
and I'll show you how to test it okay we're in the Pronterface folder we're
gonna open up Pronterface we're then going to connect to the device next
thing we're gonna do is we're going to home the x-axis and with their hand
we're gonna manually actuate the end stop so that it knows where the end of
the access is so I'll show you how to do that in just a second so I'm gonna click
this to home and then with my hand we are now home now what we're gonna do
is we're gonna move forward by 10 and see what happens now we're gonna move
forward by a hundred and see what happens now we're gonna move back by a
hundred
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