Added stepper switch post.

diff --git a/posts/MultiMode/stepper/backlash.mdwn b/posts/MultiMode/stepper/backlash.mdwn
index 69dbc7774c91b19f2415bb061f737c5b0208fdd7..b4b039a8cbf699ec777f63d8097f8986a0f64390 100644 (file)
--- a/posts/MultiMode/stepper/backlash.mdwn
+++ b/posts/MultiMode/stepper/backlash.mdwn
@@ -35,3 +35,5 @@ about 0.5 s when controlling the motor using the manual Up/Down
 switch.
 
 [backlash]: http://en.wikipedia.org/wiki/Backlash_%28engineering%29
+
+[[!tag tags/hardware]]

diff --git a/posts/MultiMode/stepper/switch.mdwn b/posts/MultiMode/stepper/switch.mdwn
new file mode 100644 (file)
index 0000000..6fd1c63
--- /dev/null
+++ b/posts/MultiMode/stepper/switch.mdwn
@@ -0,0 +1,42 @@
+You may want to see my [[MultiMode wiring|wiring]] summary.
+
+The manual switch is a double pole double throw (DPDT) switch. I've
+labeled the contacts below
+
+[[!inline pagenames="DPDT.svg" template="raw" feeds="no"]]
+
+In my [[MultiMode]], the switch contacts are wired as follows:
+
+* Contacts 1, 4, and 6 are shorted together, and fed by a white-brown
+  striped wire,
+* Contact 2 is a purple wire,
+* Contact 3 is a black wire, and
+* Contact 5 is a grey wire.
+
+Using a multimeter to measure the average voltages I got:
+
+<table>
+  <tr><th>Wire</th>  <th>Up</th>  <th>Down</th><th>Off</th> <th>Role</th>     <th>Main</th><th>DB-25</th></tr>
+  <tr><td>Black</td> <td>0.2V</td><td>0.2V</td><td>0.0V</td><td>Ground</td>   <td>UL+4</td><td>none</td></tr>
+  <tr><td>Purple</td><td>5.0V</td><td>0.2V</td><td>0.0V</td><td>Direction</td><td>UL+5</td><td>none</td></tr>
+  <tr><td>Grey</td>  <td>5.0V</td><td>5.0V</td><td>0.0V</td><td>Enable</td>   <td>LL+6</td><td>none</td></tr>
+  <tr><td>White</td> <td>5.0V</td><td>5.0V</td><td>5.0V</td><td>Power</td>    <td>UL+6</td><td>3</td></tr>
+</table>
+
+So the white and black wires carry power and ground to the switch, and
+the purple and grey wires carry the switch information back to the
+electronics. The 'Main' column records the line's lead on the main
+circuit board in the MultiMode, and the 'DB-25' column records the
+line's lead on the DB-25 cable to the NanoScope controller.
+
+From the main-connector, the grey and purple lines start spreading
+out, ending up at (partial list):
+
+* H7555IBA, a CMOS clock.
+* NCAFMJM, a top-secret something-or-other.
+
+My guess is that the grey enable-wire from the switch turns on the
+H7555 timer, and the NCAFMJM is a stepper driver chip, which receives
+a direction input (the purple wire) and a pulse-to-step input (the
+H7555 output). The output of the NCAFMJM heads over to a DS3658N
+current driver which drives the motor.

diff --git a/posts/MultiMode/stepper/switch/DPDT.svg b/posts/MultiMode/stepper/switch/DPDT.svg
new file mode 100644 (file)
index 0000000..e9c457e
--- /dev/null
+++ b/posts/MultiMode/stepper/switch/DPDT.svg
@@ -0,0 +1,40 @@
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