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  1. #1
    RC Turnbuckle Jr. JimmyNeutron's Avatar
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    My 2238 Project...

    First off I want to thank danielhr77 for starting and participating this thread:
    http://traxxas.com/forums/showthread...-4-Channel-Mod

    I was doing some research and stumbled upon it... because of this thread I now have two 5 channel 2238's! One was 5 channels straight off, the other I was able to change from a 2 into a 5 using the ground to vss method.

    I have a Summit coming in the mail on Tuesday that should have a TQi 6508. Since I have no personal desire to use the TQi, so I plan on trading and/or selling it for another 2238 plus cash; or two 2238's, depending on what I end up needing... probably two 2238's because I like having a controller for each of my RC's.

    My goal is to have a remote that can control the following from a single remote:
    ESC
    Steering
    Steering selector for PunkRC's Steering Computer
    Front Locker
    Rear Locker
    Transmission High/Low
    LED switch (Rx operated switch)
    Fan switch (Rx operated switch)
    and possibly a Horn, space allowing

    To do this I would need at least a 8-9 channel Rx/Tx which I have found nearly impossible to find in Pistol Grip form. The few that I have found with more than 4 channels are extremely expensive.

    Since I feel qualified to perform the procedures to convert a single 2238 into two 2238's in the same housing, I decided that this is a project that I can tackle without too much difficulty... as long as I have someone to help with a few questions along the way. lol

    They only hurdle I have at this moment is where to put the batteries as I have chosen to place the board for the second controller below the original controllers' board; displacing the battery tray.

    Here is a picture of what I have in mind for the finished product:

    Subject to change, of course.

    This is what I have done so far...
    1) I have been able to convert both of my 2238's to 5 channel Tx's.
    2) I have figured out the circuit board... to a point. I still have some playing to do.

    What I need to do...
    1) Figure out where to put the batteries.
    I have chosen to place the board for the second controller below the original controllers' board; displacing the battery tray. One option is getting a project box to house a 6.6v LiFe battery.
    2) Figure out the rest of the circuit board... how it operates the channels
    3) Figure out if the Tx can handle 6.6 volts.
    4) Figure out what pole/throw switches I am going to need.
    5) Find a good source (not much of anything locally) for the switches and project box.
    -plus more, I am sure. lol

    Any help is appreciated!!
    Whatever it is I just typed... could be wrong.

  2. #2
    RC Turnbuckle Jr. JimmyNeutron's Avatar
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    Today I was able to figure out how to wire the following:

    Channel 1
    Start = Center
    Ground to ST = Full Right
    Power to ST = Full Left

    Channel 2
    Start = Center
    Ground to TH = Full Left
    Power to TH = Full Right

    Channel 3
    Start = Center
    Ground to RSW DWN = Full Left
    Ground to RSW UP = Full Right

    Channel 4
    Start = Full Left
    Ground to TSW UP = Full Right

    Channel 5
    Start = Full Right
    Ground to TSW DWN = Full Left

    Channels 1-2 have reversing, sub trim, end points, expo; Channels 3-5 only have reversing.


    Here is where I need some help...
    I cannot activate channels 4 and 5 at the same time.

    How can I get these two channels to activate together?

    I assume that channel 4 and channel 5 can be on at the same time, because the 1/10 Summit has its front differential locker servo in channel 4 and its rear differential locker in channel 5.
    I understand that 4 needs to be activated before channel 5 can be activated, but I cannot figure out how...
    Whatever it is I just typed... could be wrong.

  3. #3
    RC Turnbuckle Jr. JimmyNeutron's Avatar
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    I have found out how I can get 4 AA batteries fit into the housing with the extra board... but I am not sure I am going to go that route as it would require me to solder wires directly to the battery.
    Whatever it is I just typed... could be wrong.

  4. #4
    RC Turnbuckle Jr. JimmyNeutron's Avatar
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    I found a LiFe pack that will fit into the handle!!
    Only 700mah, but it should work just fine... I'll install a LCD display for voltage.
    Whatever it is I just typed... could be wrong.

  5. #5
    RC Turnbuckle Jr. JimmyNeutron's Avatar
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    I did some modding today and got the lower board mounted below the upper one.
    TIGHT FIT is all I got to say... not a mm to spare!

    Need to get my Summit so I can trade/sell the TQi for two 2238's and a set of Revo/Summit center shafts. Then I can start cutting my final case as I made a mistake or two with this one.


    I was going to install the switch cover but I think it would just fall off all the time, so I am going to just cut out the area for the switch to slide on the next case.
    Also, the LED hole is lower than it should be by a little bit.
    Whatever it is I just typed... could be wrong.

  6. #6
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    Very nice idea but receiver wise what are you going to do?
    Does more $ = More fun?
    Rustler VXL

  7. #7
    RC Turnbuckle Jr. JimmyNeutron's Avatar
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    Run 2 receivers... as I basically have two remotes stuffed into one case.

    (thanks for making me feel like I am not just talking to myself here... lol)
    Last edited by JimmyNeutron; 02-17-2012 at 11:34 PM.
    Whatever it is I just typed... could be wrong.

  8. #8
    RC Champion
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    This looks like a fascinating project, Jimmie! The cool thing is, with the LINK system, you can use this mega controller for all of your cars! The possibilities become endless. Please continue to post updates as you have them.
    Two Rusty VXLs, M2Ks 18/83 - Tag! You're it!

  9. #9
    RC Turnbuckle Jr. JimmyNeutron's Avatar
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    I will... no worries there. lol

    I have been working on my PS project for the past few days... nothing Traxxas there so I have not been posting anything on it... not sure if I can. But, when I get it done I'll have a 24v 75amp 1800watt power supply with 3 power points and it will be fully portable with storage for the charging goodies... charger, paraboards, harnesses, ect. I have it all soldered up and working, just need to go to a friends wood shop to make the case.

    (Mods, if you read this; could you tell me if I can post my PS project somewhere on this site? Thanks!)
    Whatever it is I just typed... could be wrong.

  10. #10
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    I'm no mod, but you ought to be able to post it in the Alley (off-topic) forum, at least.
    Two Rusty VXLs, M2Ks 18/83 - Tag! You're it!

  11. #11
    RC Turnbuckle Jr. JimmyNeutron's Avatar
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    I just ordered a bunch of stuff:

    2 - 3.3 x 2.1 x 1.4 Project boxes for the Rx/electronics
    2 - 3.6 x 1.5 x 1.2 Project boxes for the Rx/electronics
    (using one or the other... cheaper to order both and extras due to shipping)
    5 - Push on/off SPST Switches
    2 - Push on Momentary Switches
    2 - on/off Rocker Switches
    2 - on/off/on Rocker Switches

    All the above is not just for this project, some of it will be used in another radio project.
    There will be more orders happening soon...

    One item is the ******* Receiver Controlled Switch (LUM-ONF)
    Whatever it is I just typed... could be wrong.