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    Servo problem.
    by MouldBuilder ๐Ÿ‡ฌ๐Ÿ‡ง ( Captain)
    ๐Ÿ“ฃ










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    53 Posts 52 Replies 14 Photos 101 Likes
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    G6SWJ
    Chief Petty Officer 1st Class
    ๐Ÿ“ Servo problem.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 5 hours ago
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    Hi Martin,

    Not been around much and I am sorry I missed your question. All 3 subs are Engel's - the Type 7 a beauty and the 2 Typhoons in various states of refit and definately not beauties...

    No surprise I am slowly filling one Typhoon with my own control system ("Chase the bubble") but other projects keep jumping the queue so progress is painfully slow.

    Regards
    Jonathan
    2
    I think it's the way I have learnt most of my stuff - getting very stuck first...
    Martin555
    Fleet Admiral
    ๐Ÿ“ Servo problem.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 7 hours ago
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    Hi Jonathan,
    This is way to heavy for me but i would like to know more about the Typhoons and the Type7.

    Martin555.
    If it looks right it probably is.
    G6SWJ
    Chief Petty Officer 1st Class
    ๐Ÿ“ Servo problem.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 5 hours ago
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    Hi Doug,

    I'll post a bit more when I have more time...

    I assume the display is showing us the pulse width in ยตS? >>> YES

    I'm further assuming that the slider display on the left should show the analogue of the control stick/servo tester pot position. >>> NO - this is just a display of the value on an iPhone screen - the slider you refer to is the "microphone" slot of the iPhone case


    Can you post a pic or diagram of the test setup please? >>> To follow

    By what is the PWM read? >>> MICROPROCESSOR - accurate to >5us

    I'm also wondering if the capture, conversion, WiFi circuits are introducing their own delay/jitter/distortion. >>> NO EFFECT OR IMPACT

    I also have some expensive long tubes that float below the surface - 2 x Typhoon and Type 7

    Regards
    Jonathan
    2
    I think it's the way I have learnt most of my stuff - getting very stuck first...
    RNinMunich
    Fleet Admiral
    ๐Ÿ“ Servo problem.
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    Country: ๐Ÿ‡ฉ๐Ÿ‡ช Germany
    Online: 4 days ago
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    Then ...
    Hope you have a good trip to Hungary without too many complications and
    รœdvรถzlettel, hogy a jobbik fele Zsuzsa !
    (Hope I haven't just insulted her Grandma or summat!!๐Ÿ˜ฎ)
    Maybe Zsuzsa will quarantine you in your new workshop? ๐Ÿ˜๐Ÿ˜‚๐Ÿคฃ
    Best wishes to you both.
    Cheers, Doug ๐Ÿ˜Ž
    1
    Young at heart ๐Ÿ˜‰ Slightly older in other places.;-/ Cheers Doug
    MouldBuilder
    Captain
    ๐Ÿ“ Servo problem.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 12 hours ago
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    Thanks Doug.
    I am ok to quarantine in my own house. A red notice has to go on the door and the Police will visit at least four times to check.๐Ÿ™€
    For the record, Zsuzsa says it was correct.๐Ÿ‘๐Ÿป
    2
    I promise I will finish a boat project before I start another......Maybe.
    RNinMunich
    Fleet Admiral
    ๐Ÿ“ Servo problem.
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    Country: ๐Ÿ‡ฉ๐Ÿ‡ช Germany
    Online: 4 days ago
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    A man of many talents and projects Pete๐Ÿ‘
    Have fun with the Magyar, hope you can take your Police Launch and tools with you in quarantine๐Ÿคž (And/or the Missus!๐Ÿ˜ฎ) ร“, La La!!๐Ÿ˜‰
    Stay safe Shipmate. (Maradjon biztonsรกgban Shipmate! I hope that's right๐Ÿ˜)
    Cheers, Doug ๐Ÿ˜Ž
    1
    Young at heart ๐Ÿ˜‰ Slightly older in other places.;-/ Cheers Doug
    MouldBuilder
    Captain
    ๐Ÿ“ Servo problem.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 12 hours ago
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    Hi Doug.
    The build is slow at the moment as I am concentrating on Dรผsseldorf. I can wait as I am away in Hungary for a month soon. So long as our Government donโ€™t mess up again.
    I will finish the Police Launch whilst there as it looks like I will have 2 weeks quarantine.
    2
    I promise I will finish a boat project before I start another......Maybe.
    RNinMunich
    Fleet Admiral
    ๐Ÿ“ Servo problem.
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    Country: ๐Ÿ‡ฉ๐Ÿ‡ช Germany
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    Hi Peter,
    "Wish I understood half of this stuff.
    Reading between the lines, would it be better if I bought some analogue servos as I am sure the dive planes will not like to shudder.๐Ÿ˜Š "
    You might be right Pete๐Ÿค”
    But don't look for the cheapest.
    Look for something with metal gears and a high torque value.
    They should come close to the higher holding power of the digital servos.
    As previously discussed; the holding power is important to prevent the pressure of water currents on the dive planes altering their position!

    How is the sub build going anyway?
    Maybe you have time to wait and see what the investigations of Jonathan and myself bring to light?
    Cheers, Doug ๐Ÿ˜Ž
    2
    Young at heart ๐Ÿ˜‰ Slightly older in other places.;-/ Cheers Doug
    RNinMunich
    Fleet Admiral
    ๐Ÿ“ Servo problem.
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    Country: ๐Ÿ‡ฉ๐Ÿ‡ช Germany
    Online: 4 days ago
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    Hi Jonathan,
    Interesting.
    I assume the display is showing us the pulse width in ยตS?
    Which for standard servos should vary between 1000 and 2000. 1500 being neutral/rest.
    I'm further assuming that the slider display on the left should show the analogue of the control stick/servo tester pot position.
    So we should actually see that move up and down when the control input is moved.
    But I can't see any correlation there!
    As an ex test/development engineer I have to ask๐Ÿ˜”
    Can you post a pic or diagram of the test setup please? By what is the PWM read?
    I'm also wondering if the capture, conversion, WiFi circuits are introducing their own delay/jitter/distortion. Early on in my career I learned the test engineers mantra; keep the test setup as simple as possible, commensurate with the parameters to be measured, and enclosed. WiFi is NOT enclosed and is subject to it's own interference sources.
    Unless you are living as a hermit in a cave due to Corona๐Ÿค”
    But if it is only transmitting the captured values as bits it probably has little or no influence here. It's the capture and conversion accuracy which is important.

    Jitter has always been a major problem in telecommunications, esp. since digital exchanges, line amplifiers and Internet nodes, relays etc.
    Many of my colleagues back then made a good living from the purveying of expensive Jitter measurement systems.

    As previously written; I'll do some tests the 'traditional' way.
    Using a fast scope with high impedance inputs that have the least possible influence on the results.
    I hope that my dual trace scope is good enough, and fast enough, to show me simultaneously the difference between what is generated in the TX / Servo Tester and what is actually fed to the servo from the RX.
    If it works it could be quite enlightening. I can scarcely hope to compete with the manufacturers though๐Ÿค” But I'll do my best.

    Off to the 'bench' to sweep away my micro RC gear tests to investigate this phenomenon.

    I have a vested interest as I have a large (and expensive) Akula 2 sub kit also using 40MHz RF.
    So I will also test the included RX and dive plane servos and depth control systems most exhaustively! I also have a dynamic diving 1/72 type 1A U-Boot that I was hoping to convert to static diving. If I remember correctly this whole investigation started with an enquiry related to a submarine project.
    C U in a week or month or so ....
    (Please send a search party, with Red Cross recuperative water and food pack if nothing heard after four weeks๐Ÿ˜‰)
    Cheers, Doug ๐Ÿ˜Ž
    3
    Young at heart ๐Ÿ˜‰ Slightly older in other places.;-/ Cheers Doug
    MouldBuilder
    Captain
    ๐Ÿ“ Servo problem.
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    Country: ๐Ÿ‡ฌ๐Ÿ‡ง United Kingdom
    Online: 12 hours ago
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    Wish I understood half of this stuff.
    Reading between the lines, would it be better if I bought some analogue servos as I am sure the dive planes will not like to shudder.๐Ÿ˜Š
    2
    I promise I will finish a boat project before I start another......Maybe.
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