Module from MLP4DSM Wired Up

Here’s the module taken from the MLP4DSM transmitter that comes with E-Flite RTF kits. It shows the wiring necessary for hookup to the Turnigy 9x running custom firmware that supports the DSM2 protocol.

See this post for location of the 3.3v pad to solder the red wire to.

I added an LED inline with the PPM signal wire. Because the LED is a diode, it drops the voltage of the PPM line from 5v to the 3.3v that the DSM2 module can handle.

To protect the entire assembly, I used 1/2″ clear shrink tube. The clear shrink tube allows me to see the status LED onboard the DMS2 module.

Everything is working great with the latest th9x firmware. I was able to bind to my mSR by holding the trainer switch while powering up the transmitter.

On the er9x front. Mike Blandford was able to get the th9x source code properly added to the er9x firmware. Use build r635 or later. I was successful in using his firmware in connecting the Turnigy 9x TX to the mSR. Great job Mike!

*04/23/2012 Update*
This setup continues to work without a hitch for me. I have since bound to and controlled the following Blade models successfully: mCX2, mSR, mCP X, 120SR and mSR X.



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15 responses to “Module from MLP4DSM Wired Up”

  1. Dafremen Avatar

    REaly outstanding work guys. And thanks Mike!

    1. Jonasglim Avatar

       hello, how many channels you can send with this form? the mcpx requires 6 ch. ppm with a MX12 might work? ps-great idea!

      1.  Avatar

        This particular module can send 6channels. I don’t know if it’ll work with your MX12 because the hardware is one part of the solution. It needs the transmitter to send out serial data for this module to understand. The er9x folks were able to add the DSM2/DSMX protocol to their custom firmware so it outputs the data this module can understand. That is why we can use these modules in our Turnigy 9x, FlySky TH9x, Eurgle and Imax transmitter. Hope that makes sense.

  2. Alfonso Schembri Avatar

    Hello to everyone.
    So you did not used a resistor. This is because you used the 3.3 pad, right?
    And the PPM line that is running on 5v, using a diode will drop to 4.3, not 3.3, will this “high” voltage burn the module on the long time?
    Thank you for your answer

    1. Cjapka Avatar

      Helo Alfonso, do you know any answer yet? I have the same problem, but also I dont know, where is the signal wire in the 9x… Dont U know, please?  Thanks, Ondrej

      1.  Avatar

        The signal wire is on the back plane. It’s the top most pin. See this post for a photo:

        1. Cjapka Avatar

          Thanks !!!!!! It works!! ;)

          1.  Avatar

            Cool. Congrats!

    2.  Avatar

      Yes, the DSM module is being feed a perfect 3.3v because it connects to the 3.3v regulator. I think 4.3v is the upper limit of that module’s…but not proven in the long run. It’s best to get a 3.3v regulator dedicated solely to stepping down the 5v power to the safe 3.3v the DSM module requires. If you are grabbing the module from the RTF MLP4DSM, there is a 3.3v regulator in there that I desoldered and used. Peace of mind. I suggest you do the sam.e

  3. Erik Avatar

    You’re calling that pin the PPM pin, but does the RF module actually accept a PPM signal on that pin?

    1.  Avatar

      Yes, the RF module accepts a PPM signal on that pin (The left most pin at the bottom of the MLP4DSM module). That blue wire is attached to the LED at the bottom of the module. The LED is used to drop the PPM voltage from the Turnigy transmitter down to an acceptable 3.3v level.

      Perhaps I could answer your question better if I know the reason you ask. The module as wired that way works like a charm. I have used it to bind and control mSR, mCX2, mCPX, 120SR and mSR X. 

    2.  Avatar

      Hmmm…re-reading your question. I think I may have answered it incorrectly.

      The DSM2 module actually needs serial data. The blue wire marked PPM is soldered to the PPM pin on the Turnigy 9x. However, ER9x firmware put into DSM2 mode actually sends a serial stream to the PPM pin as far as I understand it. That’s the language the DSM2 module understands and thus able to use to communicate with the DSM2 RX.

      1. Tony Avatar

        Reading the post on taking the 2.4ghz module out of the mlp4dsm -great work! I want to do the same, however, can you post a pic of the 3.3 voltage regulator that you took from the mlp4dsm?

  4. Khaled Avatar

    Hi ,

    Interesting … It could be useful if I wanted to use the MLp4DSM blade Transmitter with a simulator … in this case I need to find the PPM out … and GND ands that’s it

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