PanamaMike
Registered
I successfully made my own IR cable for Mares infra red
dive computers. I used the information at www.ektm.de
and www.cardew.org/edward on this. I made one with yet
more generic parts than they used. I've got a documentation
package that include a schematic(that simulates in the free
circuit simulator LTspice), a layout for perf board as it
uses no surface mount devices, some photos, and some
information on the communications protocol used. The zip
file is 372K. Is there a place here at Scubaboard that
I can share this with? Below is the ReadMe.txt file from
the .zip file
Regards,
--Mike
This is the documentation for a DIY infrared interface cable for use the
Mares dive computers that use IR instead of wire connection. The design
is based in part on information obtained from http://www.ektm.de and
http://www.cardew.org/edward. Inasmuch as some of that is copylefted,
that would impact this design. I have no interest in any copyright of
this material. I only claim that I wrote it, build it and it works. I'm
posting it because someone else might find it useful or interesting.
I didn't follow those designs mentioned above exactly because they used
parts that I would have had to have mail ordered and are increasing
difficult to obtain in through-hole versions. For example, instead of
using high voltage CMOS for the transmitter logic, I used a couple of
cross-coupled 2N3904's which also eliminated a crystal oscillator.
The IR xmit and receive diodes were taken from a piece of defunct consumer
audio equipment. I think the most critical part of the design is to use
a receiver diode that doesn't have too much capacitance. The one I found
has 1nF which is a lot but still works.
The schematic and layout are drawn in LTspice/SwitcherCAD III, an unlimited,
free high performance SPICE program that you can get from Linear's home
page, http://www.linear.com. Put all of the files in the same directory
to be able to view the layout in LTspice.
Distribution File Contents
Application.jpg A photo using the cable with an AirLab
DesignNotes.txt Design notes
IRD.asy A symbol used in Layout.asc
LGcap.asy A symbol used in Layout.asc
LT1018dip.asy A symbol used in Layout.asc
Layout.asc A layout that you can simulate
Photo.jpg A photo graph of the circuit
RN55.asy A symbol used in Layout.asc
RN55upright.asy A symbol used in Layout.asc
ReadMe.txt This file
SMcap.asy A symbol used in Layout.asc
SMdiode.asy A symbol used in Layout.asc
Schematic.asc An LTspice schematic file that simulates.
Schematic.wmf An Windows Meta File image of the schematic
TO92.asy A symbol used in Layout.asc
coaxCap.asy A symbol used in Layout.asc
header9.asy A symbol used in Layout.asc
dive computers. I used the information at www.ektm.de
and www.cardew.org/edward on this. I made one with yet
more generic parts than they used. I've got a documentation
package that include a schematic(that simulates in the free
circuit simulator LTspice), a layout for perf board as it
uses no surface mount devices, some photos, and some
information on the communications protocol used. The zip
file is 372K. Is there a place here at Scubaboard that
I can share this with? Below is the ReadMe.txt file from
the .zip file
Regards,
--Mike
This is the documentation for a DIY infrared interface cable for use the
Mares dive computers that use IR instead of wire connection. The design
is based in part on information obtained from http://www.ektm.de and
http://www.cardew.org/edward. Inasmuch as some of that is copylefted,
that would impact this design. I have no interest in any copyright of
this material. I only claim that I wrote it, build it and it works. I'm
posting it because someone else might find it useful or interesting.
I didn't follow those designs mentioned above exactly because they used
parts that I would have had to have mail ordered and are increasing
difficult to obtain in through-hole versions. For example, instead of
using high voltage CMOS for the transmitter logic, I used a couple of
cross-coupled 2N3904's which also eliminated a crystal oscillator.
The IR xmit and receive diodes were taken from a piece of defunct consumer
audio equipment. I think the most critical part of the design is to use
a receiver diode that doesn't have too much capacitance. The one I found
has 1nF which is a lot but still works.
The schematic and layout are drawn in LTspice/SwitcherCAD III, an unlimited,
free high performance SPICE program that you can get from Linear's home
page, http://www.linear.com. Put all of the files in the same directory
to be able to view the layout in LTspice.
Distribution File Contents
Application.jpg A photo using the cable with an AirLab
DesignNotes.txt Design notes
IRD.asy A symbol used in Layout.asc
LGcap.asy A symbol used in Layout.asc
LT1018dip.asy A symbol used in Layout.asc
Layout.asc A layout that you can simulate
Photo.jpg A photo graph of the circuit
RN55.asy A symbol used in Layout.asc
RN55upright.asy A symbol used in Layout.asc
ReadMe.txt This file
SMcap.asy A symbol used in Layout.asc
SMdiode.asy A symbol used in Layout.asc
Schematic.asc An LTspice schematic file that simulates.
Schematic.wmf An Windows Meta File image of the schematic
TO92.asy A symbol used in Layout.asc
coaxCap.asy A symbol used in Layout.asc
header9.asy A symbol used in Layout.asc