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Norwich MBC Submariners joint Model Boat weekend - 27/28th July

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    Arduino proportional control of a piston tank

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    tsenecal
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    Arduino proportional control of a  piston tank - Page 2 Empty Re: Arduino proportional control of a piston tank

    Post  tsenecal on Thu Feb 21, 2019 3:43 pm

    C-3PO...

    things get even weirder when you throw in what i am doing, and what the Teensy is doing...  they are basically co-opting the software to work with the "almost the same" hardware, bending it far beyond what you would think is prudent in some cases to get their hardware support up to the same level as arduino's IDE support for arduino hardware is.
    david f
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    Arduino proportional control of a  piston tank - Page 2 Empty Re: Arduino proportional control of a piston tank

    Post  david f on Fri Mar 15, 2019 10:15 am

    I have just been building another piston tank for the CSS Pioneer. (I will post a photo in the next day or so.)

    I have been planning to use one of the smaller commercial H bridge units together with an Arduino for the proportional control. The software is giving some issues in connection with the failsafe (At least it failsafes too successfully, too often!) But just a reminder warning that this software has still not been used "in the wet" in a model.

    The PIC version has been "battle" (Oh alright pond!) tested for a number of years.

    More soon,

    David
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    Arduino proportional control of a  piston tank - Page 2 Empty Re: Arduino proportional control of a piston tank

    Post  david f on Mon Mar 18, 2019 9:06 am

    It is beginning to look as if the occasional glitches in failsafe are caused by power supply problems. Intermittent - the worst sort of problem!

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    Arduino proportional control of a  piston tank - Page 2 Empty Re: Arduino proportional control of a piston tank

    Post  salmon on Mon Mar 18, 2019 11:30 am

    David,
    Do you use the BEC in the ESC or do you use a separate BEC?
    I changed on one sub from using the built in battery elimination circuit on the electronic speed controller to a stand alone BEC. The glitches I was having disappeared.
    Not sure if it was the ESC being glitchy or if I was taxing the built in supply. Remember to disable the power coming from the ESC (either cut or remove the red wire from ESC).
    Peace,
    Tom


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    david f
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    Arduino proportional control of a  piston tank - Page 2 Empty Re: Arduino proportional control of a piston tank

    Post  david f on Tue Mar 19, 2019 10:34 am

    Thanks Tom. This shows the setup - still a bit of a "lash-up".

    Arduino proportional control of a  piston tank - Page 2 20190310

    You can see I'm using a Micro Gyro ESC. The BEC is well specified but I usually favour a separate switch-mode power supply, for the reasons you give. In this case, I'm trying to save space. The "issues" do seem to be triggered by servo movements.

    There are still some other software issues though. The fail-safe occasionally doesn't!

    David
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    Arduino proportional control of a  piston tank - Page 2 Empty Re: Arduino proportional control of a piston tank

    Post  david f on Thu Mar 21, 2019 9:00 am

    A bit more investigation. Servo movements were causing the Arduino to reset.

    I have disconnected the BEC in the Micro Gyro speed controller and moved to a separate switch mode power supply (this has some large electrolytic capacitors in it to buffer any voltage drop.)

    This works better but I'm still getting occasional problems with the failsafe in the Arduino software not working. Interestingly the original PIC controller board is working well in these circumstances. (If you look back in the threads, this board was developed and built to be very tough and well protected.)

    Some conclusions:

    - It is interesting how often built in BECs in speed controllers  don't work well in submarines. Too much demand from servos?

    - I will use the PIC controller board for now. (The sailing season is getting very close!)

    - Still some work needed on the Arduino version of the software in combination with the commercial H Bridges  but that is a better winter activity! (I've made a note in Github to this effect.)

    David


    Last edited by david f on Mon Mar 25, 2019 9:24 am; edited 1 time in total
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    Arduino proportional control of a  piston tank - Page 2 Empty Re: Arduino proportional control of a piston tank

    Post  tsenecal on Fri Mar 22, 2019 2:37 pm

    David,

    i find that 99% of all ESC BECs that we use (car/boat escs with reverse) are built to handle the load of a single standard size servo... which basically makes them useless for anything other than a 1/10 scale or smaller r/c car.

      Current date/time is Tue Jul 23, 2019 9:54 am