On a different topic, could you please send me a schematic of how to
   wire the Hytek to the three pressure sensors?

   Mark S.



   OK what you need is a five volt supply.

   There is a 3 pin chip called a voltage regulator. You put in any DC
   voltage up to about 15 volts and it puts out 5 volts DC. You need a
   diode in case you wire it wrong and a couple of caps to filter out
   any noise. Enclosed is a schematic.

   Then wire the pressure sensors as shown to the Hytek data acq.
   You can use up to 8 pressure sensors numbered A0 to A7.

   There are three active pins. One is 5 volts another is ground and the
   third is the analog output signal zero to 5 volts proportional to
   absolute press. Zero volts is zero inches of mercury and 5 volts
   is 29 inches of Hg or 15 psi.

   If you want to see what Tracy's sensors are telling the computer you can
   open up the EC2 and connect Tracy's sensors directly to the data acq
   using Tracy's 5 volts.

   Paul Lamar

   Here is some more stuff. If you want timing signals in your capture
   file you need to use the HyTek Dx input signals. Those are events
   like ignition coil triggers and injectors switched on.
   It is probably a good idea to use opto isolators for that kind of stuff.
   An opto isolator is merely a LED and a photo Tx.
   It is mandatory to use them with injector driver and CAS as they
   switch as much as 12 volts which will damage the HyTek.

   "A simple reason? You could use an opto isolator if you were
   uncertain about what you are doing. If you weren't sure that
   circuits you wanted to connect to an input were "safe" for your
   relatively expensive microprocessor, you could connect the
   microprocessor to the opto isolator as above, and use your circuit
   to turn the LED on and off. If you did that, then many mistakes you
   could make would only ruin the quite cheap opto isolator. The Bad
   Stuff won't jump across the gap between the LED and the
   photo-transistor. If you've used a socket for the opto isolator
   chip, always a good idea, then replacing it only takes a moment."

   http://www.arunet.co.uk/__________tkboyd/ec/ec1optoiso.htm
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   As far as injectors are concerned you can feed the 5 volts output of
   the opto to one of the analog inputs and it will automatically
   record the width of the injector pulse.

   It sure would be interesting to find out exactly what e-shaft angle
   Tracy is firing the injectors.

   Paul Lamar


   Paul,

   I've already got a 5v DC power source.  So, I'm good there.

   Do I _need_ an opto isolator in order to capture MAP data, or can the
   Hytek s/w do a sample of say 10 to 20 seconds.  I would like to keep
   this as simple as possible, at least in the beginning.  I can always
   add more capabilities later on.

   On a side note, Bobby Hughes and myself spent a couple of hours on
   Sunday re-tuning my EC-2.  It idles pretty good now down
   [p-port-3-rotor] as low as 1800 rpm, and most of the hick-ups and
   stumbles are gone as well.  The ones that remain are much less
   significant.  So, it was a fruitful day.  We still need to tune the
   portion of the MAP table that you can only get to while flying, and
   the weather is IFR right now, so that will have to wait.

   Mark


   No you don't need the opto's for manifold pressure. Just hook those
   little five volt jewels up directly as in this picture. The info
   will be stored in comma delimited form (.csv) for import to a spread
   sheet file.

   Here are a few examples. The screen shot of run 6 xls spread sheet shows
   some of  the recorded data taken at 1000 samples per second.
   The engine was running for 35,000 seconds or so at this point.
   The column on the left shows the number of milliseconds at the point
   where the data was taken.  Unless you want huge 15 meg spread sheets
   put an on and off switch so you can record data only when you need it.

   This is a VERY powerful tool for studying intake manifolds.

   There is also a spread sheet plot of the raw data in this attached
   screen shot.

   The big advantage of monitoring the injectors is you have a file on hard
   disk of your curent tuning. Other people can do the same thing and
   then a direct comparison can be made. If somebody is having trouble
   they can compare their mixture settings with yours. This is a
   powerful tool for tuning Tracy's system. I can also store these and
   send them out to people with similar airplanes.

   Paul Lamar


   Paul,

   I'm anxious to get it wired up and start logging data.  I envision using
   a tee on each of the three rotors' vacuum ports.  Since all three ports
   are tee'd into one line, will I need check valves to isolate the pulses?

   Mark

   I would use 3 pressure sensors. One for each port. Then you really know
   what is going on. If you get big leak in the throttle cable
   end you will see a different wave shape for that port. I am thinking
   of doing a PC board to hook the Hytek to at least 3 pressure
   sensors, the CAS, All six injectors and all six ignition trans formers.
   It will be equipped with opto isolators where needed and a 5 volt
   power supply.

   What do you think?

   Paul Lamar



   Suggest you include fuel pressure too.  I'll take one.

   Mark

   I am working on the PC board as we speak.

   Why fuel pressure? It is supposed to be constant.

   What brand of fuel pressure sensor are you using? Take a pic and
   send it to me. This is the one I have in the RV4.

   Paul Lamar


   Fuel pressure to see & verify that the regulator is doing what we
   expect.  There have been a number of cases where people have purchased
   the wrong fuel pressure regulator and then had trouble figuring out why
   their engines wouldn't run as expected.  It just seems like a good thing
   to see, but if you have an EM-2, you already know that it is/isn't
   working.

   Mark

   The fuel pressure sensors are expensive. If you have a spare you
   could loan it to me. They apparently are a simple resistor so we
   will have to measure the resistance and design a circuit that will
   change them to a zero to five volts out circuit. That will mean
   pumping them up to max
   pressure of around 100 psi. Lacking that you could try measuring
   yours with the engine running and an ohm meter. I am open to other
   ideas.

   Paul Lamar

   -- The Rotary Engine News Letter. Powered by Linux.
   ACRE NL web site. http://www.rotaryeng.net
   You Tube key word PaulLamar2
   Copyright 1998-2012 All world wide rights reserved.

   Paul,

   Sorry, I didn't mean to insinuate that I had some fuel pressure sensors
   on hand.  I have a fuel pressure regulator on my a/c.  It has a fuel
   pressure sensor that feeds info to the EM-2.  Most of the rotary guys
   have the EC-2 and EM-2, so they can see the pressure data off the EM-2.
     Could we tap into the existing pressure sensor, or would that screw up
   the EM-2?  My guess is that Tracy would advise against it.  Maybe we
   could temporarily disconnect the EM-2 from the fuel pressure sensor
   while we run our analysis, then reconnect when done.  If people didn't
   want to do that they could just not use it.

   I just thought it might be helpful in spotting problems if it was on the
   graph along with all the other information.  Maybe we could find an
   alternative pressure sensor that would do the job for less money.

   Mark

   You are right about taping into it.
   Perhaps you can buy one and just use the new sensor.

   Paul Lamar
   --
   The Rotary Engine News Letter. Powered by Linux.
   ACRE NL web site. http://www.rotaryeng.net
   You Tube key word PaulLamar2
   Copyright 1998-2012 All world wide rights reserved.

Paul,

My new Hytek data logger arrived today.  I loaded the iDAQTest&Log
software, connected the unit via the supplied USB cable (green LED is
lit), but the s/w doesn't recognize the Hytek.  It shows up in my Device
Manager.  The error message that pops up reads, "Error Code = 5002
 Message: device index exceed the max device number of that type".
 There is no HELP button, and the User's Guide isn't any help either.
 Got any suggestions?

Mark

What OS are you using? How many USB are plugged in?



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Paul Lamar