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--- make_encoders_out_of_your_mouse [2006/12/26 20:31]
+++ make_encoders_out_of_your_mouse [2006/12/26 20:31] (current)
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+====== Make Encoders out of your mouse ======
+===== Disclaimer ====
+The following manipulation has been tested on a logitech M-M35 mouse, with a
+"rev C" PCB. There is no guarantee that it will work with other revisions
+of the PCB, and even less with other models.
+The content of this page is given to you "as is". I am not giving you any
+guarantee of any kind. It is the result of a single test and it doesn't
+mean that it will work the same for you.
+===== Abstract =====
+This page focuses on the electronical side of
+the encoder. It will show you how to connect the
+PCB of a logitech M-M35 mouse to a DIN.
+{{http://homepage.sunrise.ch/mysunrise/d.jann/ucapps/wiki/images/IMG_0722.jpg}}
+===== Connections =====
+The following manipulation will let you use ONE of the encoder.
+The mouse needs to be powered by a 5V source. On the picture below, the orange cable
+(left cable) is the 0V (GND) and the red one(right cable) is the +5V. You can either
+remove the female connector and solder your cables on the male connector or (like I did)
+use the original connector.
+{{http://homepage.sunrise.ch/mysunrise/d.jann/ucapps/wiki/images/IMG_0720b.jpg}}
+I have removed the other two cables from the connector to use them for the signals
+of the phototransistors.
+On the other side of the PCB you need to solder the two cables that will
+receive the signals from the phototransistors, as shown on the picture below.
+This will let you use the encoder that's on the left on the picture above (on the
+right on the picture below).
+If you want to use the other encoder, you'll need to connect two more cables
+next to the brown and black cables, at their left (not tested yet).
+{{http://homepage.sunrise.ch/mysunrise/d.jann/ucapps/wiki/images/IMG_0719.jpg}}
+On the DIN board, you'll need to remove the pull-ups resistors, because the
+phototransistors signals cables already output a stable voltage (either 0V or
+approx. 5V). I haven't tested with the pull-ups resistors on, but I think it
+won't work, because the mouse PCB works with very low currents.
+Now connect the other ends of the cables to the DIN board as shown below. The
+red cable (+5V) is connected to the upper part of the resistor. It isn't very
+nice, but it works...
+{{http://homepage.sunrise.ch/mysunrise/d.jann/ucapps/wiki/images/IMG_0721.jpg}}
+It isn't a problem if you switch the brown and black cables. It will
+only switch your encoder's counting (ie turning it right will increase values
+instead of decreasing them).
+===== Other informations =====
+==== Observations on the operation of the mouse  ====
+The IR LED is powered by very short current peaks (PWM)
+The two IR phototransistors are integrated into
+one chip. When turning the coded wheel, a 0V is
+measured on one pin, a 4.8V on a second a pin,
+and two shifted square signals (0V-4.8V) on the two other
+pins.

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