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And the homebrew PICAXE TCU project reawakens

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    And the homebrew PICAXE TCU project reawakens



    It's all soldered up on a perfboard about 2.5" x 4". There's a nice little project box that it fits into with no room to spare.

    The project was delayed by the phenomenon known as 'decent weather'. Since we had a rather chilly weekend last week, I was able to put some time into it. The underside is something of a rat's nest of slender wires going here and there -- quite a mess, considering the total component count is 14 items. (There are three linear regulators -- the L7805's -- because the incoming signals from the bar control left & right are 12v, and would kill the PICAXE otherwise... I couldn't think of a dependable way around this. )

    After a boatload of soldering, it was pretty satisfying to hook it up and have it work exactly as it was designed, right off the bat. To test the self-cancel, I still had to use a separate breadboarded PICAXE to simulate the pulses I'll get from the reed switch in the speedo.

    After fighting for most of the project with a garbage Radio Shack soldering pencil that refused to tin, I broke down and bought a new Weller soldering station -- once I was about 90% finished. The new pencil is a dream to use, especially compared to the RS unit.

    It's time to finish epoxying and squeeze this into its box with the OEM TCU's harness, so it plugs in where the original did. The second half is mostly hookup -- I'm replacing the '81-style bar control with a unit I reworked off of a '79 GS-something with self-cancels. The finishing touch will be to install a pair of super-bright LED arrays into the front signals; these will be wired to be on all the time as running lights (except, of course, when they're blinking).

    The way this is set up, it's really not much of a stretch to conjure up a direct plug & play replacement for a deceased original TCU. Simpler than this unit, and certainly less money than an original -- provided you can even find one that's likely to work properly.
    and God said, "Let there be air compressors!"
    __________________________________________________ ______________________
    2009 Suzuki DL650 V-Strom, 2004 HondaPotamus sigpic Git'cha O-ring Kits Here!

    #2
    nice work mr. barr! now chef me up a replacement board for my electronic tach, willya?

    greg
    1983 GS 1100 ESD :D

    Comment


      #3
      Robert,

      Tell me about Picaxe.
      I have some familiarity with op amps and with 7400 DIP (although that was 30 years ago).

      Dave

      .
      http://webpages.charter.net/ddvrnr/GS850_1100_Emblems.jpg
      Had 850G for 14 years. Now have GK since 2005.
      GK at IndyMotoGP Suzuki Display... ... GK on GSResources Page ... ... Euro Trash Ego Machine .. ..3 mo'cykls.... update 2 mocykl


      https://imgur.com/YTMtgq4

      Comment


        #4
        Wait a minute, I thought this was a beer thread.

        Comment


          #5
          Originally posted by Redman View Post
          Robert,

          Tell me about Picaxe.
          I have some familiarity with op amps and with 7400 DIP (although that was 30 years ago).

          Dave

          .
          Well, I could just show you:

          The PIC is a microcontroller, the kind of gadget that operates your microwave oven or the like. A simple, dedicated computer. The PICAXE is a self-contained system on a single IC -- it includes the OS and storage, as well as analog-to-digital converters and so forth. All for a few dollars.

          They are used (at least in the UK, and probably elsewhere) in elementary schools as teaching aids. They're simple enough that schoolkids can assemble and program microcontroller projects. They're not terribly versatile, and for my needs they really lack timing capabilities within their programming language, but they're beautifully simple and somewhat addictive.

          There are many similar microcontroller systems out there. PICAXE is just one of a slew of them; support varies greatly, as do costs and add-on goodies.
          and God said, "Let there be air compressors!"
          __________________________________________________ ______________________
          2009 Suzuki DL650 V-Strom, 2004 HondaPotamus sigpic Git'cha O-ring Kits Here!

          Comment


            #6
            Robert,

            Thanks for the info and the link.
            Thanks fro bringing me up to date on something I probably already should have known. SO was I 5 years out of date? 10? 15?

            Thanks again,
            Dave

            .
            http://webpages.charter.net/ddvrnr/GS850_1100_Emblems.jpg
            Had 850G for 14 years. Now have GK since 2005.
            GK at IndyMotoGP Suzuki Display... ... GK on GSResources Page ... ... Euro Trash Ego Machine .. ..3 mo'cykls.... update 2 mocykl


            https://imgur.com/YTMtgq4

            Comment


              #7
              Nice work! Time to break out the Eagle CAD and get some PCB's made for kits, right?
              Dogma
              --
              O LORD, be gracious to me; heal me, for I have sinned against you! - David

              Skeptical scrutiny is the means, in both science and religion, by which deep insights can be winnowed from deep nonsense. - Carl Sagan

              --
              '80 GS850 GLT
              '80 GS1000 GT
              '01 ZRX1200R

              How to get a "What's New" feed without the Vortex, and without permanently quitting the Vortex

              Comment


                #8
                Originally posted by Dogma View Post
                Nice work! Time to break out the Eagle CAD and get some PCB's made for kits, right?
                That would be a fun but expensive wintertime effort, no doubt. I'm sure we could shrink its size by half, and save the wear on my eyesight by about 90%. The circuit is really shamefully simple.

                I doubt I'd take it that far, but it sure would be satisfying to look at... someday. Hmm, a roll-your-own auto-cancel kit... not 100% out of the question.
                and God said, "Let there be air compressors!"
                __________________________________________________ ______________________
                2009 Suzuki DL650 V-Strom, 2004 HondaPotamus sigpic Git'cha O-ring Kits Here!

                Comment


                  #9
                  Well, I was sorta hoping. I plan to replace all my indicator lamps with the LED towers Cliff found, and I'd rather not have to add resistors to the circuit to get the flasher to work. I could buy a new flasher, but those down't work with the auto-cancel, right?
                  Dogma
                  --
                  O LORD, be gracious to me; heal me, for I have sinned against you! - David

                  Skeptical scrutiny is the means, in both science and religion, by which deep insights can be winnowed from deep nonsense. - Carl Sagan

                  --
                  '80 GS850 GLT
                  '80 GS1000 GT
                  '01 ZRX1200R

                  How to get a "What's New" feed without the Vortex, and without permanently quitting the Vortex

                  Comment


                    #10
                    Nice work but a question: if you needed a TCU why not just buy a good used one? The first generation TCU's are almost impossible to find in usable condition, but the second generation type that came out in 1980 are dime a dozen and reliable.
                    Ed

                    To measure is to know.

                    Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

                    Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

                    Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

                    KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

                    Comment


                      #11
                      Originally posted by Dogma View Post
                      I'd rather not have to add resistors to the circuit to get the flasher to work. I could buy a new flasher, but those don't work with the auto-cancel, right?
                      Yes, you'd lose self-cancel. If yours works now, I'd just go with the resistors. It's not elegant, but it gets the job done simply & reliably. Easy to hide, cosmetically. Cost, of course, is overwhelmingly in favor of resistors.

                      In my case, my TCU is deceased and I absolutely hate the later bar control, so the PICAXE approach is a natural.

                      Do you have a link to the LED's you are considering?
                      and God said, "Let there be air compressors!"
                      __________________________________________________ ______________________
                      2009 Suzuki DL650 V-Strom, 2004 HondaPotamus sigpic Git'cha O-ring Kits Here!

                      Comment


                        #12
                        Originally posted by robertbarr View Post
                        Do you have a link to the LED's you are considering?
                        No link, just this thread.

                        For sure the resistor's are cheaper, but you can't program them to turn the signals into running lights, hazards or other shenanigans.
                        Last edited by Dogma; 10-02-2012, 08:56 AM.
                        Dogma
                        --
                        O LORD, be gracious to me; heal me, for I have sinned against you! - David

                        Skeptical scrutiny is the means, in both science and religion, by which deep insights can be winnowed from deep nonsense. - Carl Sagan

                        --
                        '80 GS850 GLT
                        '80 GS1000 GT
                        '01 ZRX1200R

                        How to get a "What's New" feed without the Vortex, and without permanently quitting the Vortex

                        Comment

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