Title: Reprap stepper motor RJ45 pinout
Tags: english, nuug, reprap, 3d-printer
Publish: 2020-01-01
Date: 2009-04-13 10:00

Since my last reprap update, a lot of progress has been made.  I write
this blog post in English instead of Norwegian, because I have some
proposals regarding cabling I would like to reach the entire reprap
community.

I managed to complete the building of the reprap cartesian robot
before Go Open 2009, but ran into some problems when trying to get it
working.  The axes are not moving smoothly, and the motors have
problems pulling the bands with enough force.  More on that later.

<p>When connecting the electronics, I decided to follow the lead of
the next generation of electronics, and use RJ45 connectors to plug
everything together.

I bought connectors at Clas Ohlsson,
<a href="http://www.clasohlson.no/Product/Product.aspx?id=61105401">part
number 38-2224 "Modularuttak RJ 45/splinttilkobl."</a>.  I also got
some from ELFA, part number 42-687-77 "Jack för panelmontage" after
emptying the stock at Clas Ohlson Storo.

I went a bit further and use RJ45 connectors to connect to the stepper
motors and to connect the stepper motor driver cards with the arduino
controller.</p>

<p>For the motor, I decided to pass all motor cables through the RJ45
cable for maximum flexibility in the future, and short the cables used
to change the unipolar motor into a bipolare one on the controller
card side.  I further decided to stay close to the color coding used
in TP cables when connecting them to the RJ45 connector, and thus
connect green with green, blue with blue, orange with red and brown
with black.  This give me the following pinout:</p>

<table>
<tr><th align="left">RJ45</th><th align="left">Stepper motor</th></tr>
<tr><td>pin 1 org/wht </td><td>red/wht</th></tr>
<tr><td>pin 2 org     </td><td>red</th></tr>
<tr><td>pin 3 grn/wht </td><td>grn/wht</th></tr>
<tr><td>pin 4 blu     </td><td>blu  (short with pin 5 red/wht on controller side)</th></tr>
<tr><td>pin 5 blu/wht </td><td>blu/wht</th></tr>
<tr><td>pin 6 grn     </td><td>grn  (short with pin 7 blk/wht on controller side)</th></tr>
<tr><td>pin 7 bwn/wht </td><td>blk/wht</th></tr>
<tr><td>pin 8 bwn     </td><td>blk</th></tr>
</table>

<p>For the connection from the stepper motor controller to the
arduino, I followed the pin numbering used by the IDC connector in the
next generation electronics, mapped to an RJ45 plug:</p>

<table>
<tr><th align="left">RJ45</th>      <th align="left">Stepper motor controller</th></tr>
<tr><td>pin 1 org/wht (unused)</td> <td>VCC</td></tr>
<tr><td>pin 2 org</td>              <td>GND</td></tr>
<tr><td>pin 3 grn/wht</td>          <td>Step</td></tr>
<tr><td>pin 4 blu</td>              <td>Dir</td></tr>
<tr><td>pin 5 blu/wht</td>          <td>Enable</td></tr>
<tr><td>pin 6 grn</td>              <td>Min</td></tr>
<tr><td>pin 7 brn/wht</td>          <td>Max</td></tr>
<tr><td>pin 8 brn (unused)</td>     <td>N/A</td></tr>
</table>

<p>I plan to map the other controller card connections to RJ45 too.
Will try to keep power on pin 1 and ground on pin 2, and put control
signals on the rest.  One sad issue is that the print head controllers
(DC motor, PWM and themerature) in total uses 9 pins - one to many for
the RJ45. :( Guess I will have to find another connector for these.  I
will have to keep an eye on the plans to make print heads
hot-swapable, and see what kind of connector will be used there.

I decided to use one connector for the DC motor controller, and one
for the PWM and temperature controller.  Here is the DC motor
controller pinout.  Decided to keep the directions in one pair and the
PWM signals in another pair.

<table>
<tr><th align="left">RJ45</th>      <th align="left">Stepper motor controller</th></tr>
<tr><td>pin 1 org/wht (unused)</td> <td>VCC</td></tr>
<tr><td>pin 2 org</td>              <td>GND</td></tr>
<tr><td>pin 3 grn/wht</td>          <td>DIR A</td></tr>
<tr><td>pin 4 blu</td>              <td>PWM A</td></tr>
<tr><td>pin 5 blu/wht</td>          <td>PWM B</td></tr>
<tr><td>pin 6 grn</td>              <td>DIR B</td></tr>
<tr><td>pin 7 brn/wht (unused)</td> <td>N/A</td></tr>
<tr><td>pin 8 brn (unused)</td>     <td>N/A</td></tr>
</table>

Here is the PWM and temperature sensor controler pinout.  Decided to
group these two together, as both are connected to the heating chamber
and to save RJ45 connectors.

<table>
<tr><th align="left">RJ45</th>      <th align="left">controllers</th></tr>
<tr><td>pin 1 org/wht (unused)</td> <td>Temp driver VCC</td></tr>
<tr><td>pin 2 org</td>              <td>Temp driver GND</td></tr>
<tr><td>pin 3 grn/wht</td>          <td>Temp driver input</td></tr>
<tr><td>pin 4 blu</td>              <td>PWM driver GND</td></tr>
<tr><td>pin 5 blu/wht</td>          <td>PWM driver PWM1</td></tr>
<tr><td>pin 6 grn</td>              <td>N/A</td></tr>
<tr><td>pin 7 brn/wht (unused)</td> <td>PWM driver PWM2</td></tr>
<tr><td>pin 8 brn (unused)</td>     <td>PWM driver PWM3</td></tr>
</table>

 - z axes - remove springs and spacers


Skrivehodeutfordringer
======================

http://www.futurlec.com/Pictures/HDPIN.jpg

elfa artikkelnummer 43-833-86 eller 43-833-78 ?
43-009-64

varmetrådstørrelse 0.25mm diameter, areal ca. 0.0509mm^2
"AMPMODU hylsa 0,04-0,09 mm²" (43-833-86)

kjøpte "AMPMODU hylsa 0.13-0.36 mm²" 43-833-78, da de måtte bestille
den mindre varianten.

http://renoirsrants.blogspot.com/2009/04/coach-bolt-hack.html

plastsveisetråd
http://www.inter-supply.no/site/maler/x/?case_vis=artikkel&HmenyID=12&artikkelid=15&v_meny2=3


http://objects.reprap.org/wiki/Builders/Alternative_firmware

kapton-tape:
 Elfa - 80-899-97 eller 80-900-29, hhv 12 og 19 mm bred, og dyr :)

Elfa - 80-899-97 eller 80-900-29, hhv 12 og 19 mm bred, og dyr :)
<divid> pere: 80-907-07 for 33 mm

ELFA 43-566-08 "Kontakthus 2,54mm, 3-pol"