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SKR 1.4 – Optical Endstop

SKR 1.4 – Optical Endstop

today we’re gonna talk about the switch
endstop or the BigTreeTech SKR version 1.4 now I need to explain some
things first of all we have endstops for our X minimum our Y minimum and our Z
minimum now these on stops now are used for something else being power detection
devices and other things so we’re just gonna be talking about the optical endstop for this tutorial okay this is the underside of the optical endstop and as
you can see there is a voltage signal and ground for V, S and G those
correspond to the pins over here just keep in mind that no one’s paying me to
do this tutorial or sponsoring me but I will be placing Amazon affiliate links
in the description in order to help you find it better
here’s the top of the optical endstop as you can see there is a little line that
runs down the center once that field is broken it triggers the end stop to send
a signal to our SKR version 1.4 so I’m going to show you how to hook this
up now what we’re going to do is we’re going to
release this what we’re gonna do to hook this up is
we’re gonna apply the notched cable connection to the connector over here
but I have to let you know I traced out on the other end what the actual cable
colors will be so we have blank which is signal black which is ground in red
which is voltage so we’re gonna go back to the other end of this we’re gonna
take the notched connector we’re gonna turn this around and we’re gonna connect
it like so that are connected to the board we
already know from the previous tutorial that the top pin is voltage the middle
pin is ground and the bottom pin is signal so to connect this what we’re
going to do is we’re going to use the color cables and we’re going to connect
red voltage
black to ground finally the blank colored one his signal now to program it we need to connect the
USB serial cable so I’m going to connect the big side of the USB connector to the
board over here and the small side of the connector to the computer and you
may hear a beep okay first things first as you can see
there’s a firmware current file some people also call it a cursor file
because of the extension but for now just note the date and time so I’m going
to go over to VScode and currently I have it open with the current download
version of Marlin which is 2.0 X they’ve now included the SKR version 1.4 in
their build for the release so you can go over to Marlin then go to source and
you can check right here under pins or the LPC1768 it now has pins underscore
big tree underscore SKR underscore V1 underscore 4 dot h and inside here it
has a definition of where our pins are but we’re gonna minimize this for a
moment and we’re gonna go over to our core folder then our boards.h and
we’re gonna do a search on SKR and we’re gonna copy board underscore big
tree underscore SKR underscore v1 underscore four we’re then gonna close
out of boards.h we’re gonna minimize core and source and then we’re gonna go
to configuration dot h what we’re gonna do is we’re gonna do a search on
motherboard and we’re gonna highlight board
underscore RAMPS underscore one four underscore EFB and we’re going to paste
what we just copied and then we’re going to change the serial port from zero to
negative one and then we’re going to do a search on
endstop and as you can see currently we have
defined only the minimum and stops for X minimum Y minimum and Zed minimum and
keep in mind in the pins file these are defined as something else being other
sensors for like power but further on down here we have float state this has
to do with the resistor on the endstop it usually will even out you are setting
so you can play with this as you would like being uncommon it or not I choose
not to use it but other people may and then we also have another preventing endstop float state here for a pulldown resistors so there’s a pullup and a
pulldown but then we have inverting and in this case with the obstacle endstop
we don’t have to worry about inverting but if you need to change the logic for
let’s say you’re doing a detector for filament runout with an optical end
stop you may need to change this from false to true but a little hint if you
are using an optical endstop for filament runout it may not work in
certain situations where the filament is clear
this is based on personal experience but for now we’re gonna go over to platformIO.ini and we need to change our default environment which is our chipset
that we’re using from the Megaatmega2560 to our chipset which is the LPC1768 and if you have any questions it’s
down in this file or you can verify that it’s that type of chipset by going to
source hens and inside pins the LPC1768 we have our pins underscore BTT which
is BigTreeTech underscore SKR underscore v1 underscore 4 dot h and that is
our chip set that we’re working off of right here so I’m going to minimize this
and instead of removing the micro USB we now are connected via USB so I’m going
to do an upload with the upload button instead of just a regular compile now
the upload button has compiled features within it
and then it uploads to your device so we’re going to use that so I’m going to
click that and that may take a few moments okay once again as you can see the
compilation is finished it took about almost three minutes now to verify that
it actually finished compiling and was successful it does say the LPC1768
compiled but to confirm it what we can do was go over to our USB Drive as you
can see it does have a firmware dot bin now keep in mind the way that we
actually need to do this now is to remove our from the board and the way
we’re gonna do that is to remove the USB so note the time for the firmware and
capital letters and what we currently have so I’m going to remove the power
cord and you’ll see what happens for the USB and as you can see it’s updated to the
time of the firmware dot bin what we need to do next is we need to test the
end stop so I’m gonna go from here to my desktop where I have printrun
open up Pronterface connect to the SKR version 1.4 now I’m
gonna check the current status of the endstop which is M119 press ENTER
right now it says open so what I’m going to do next is place a piece of paper in
the optical endstop now I’m going to do M119 again and send it and as you can
see it’s triggered now when I remove the paper and do M119 again it says open so if you liked my tutorial
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plz make detailed video on that how to install TMC 2208 UART V3.0 driver on MKS GEN L V1.0 board for x and y stepper motors?

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