Servo Pulser problem


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  1. #1
    Join Date
    Jan 2007
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    Unhappy Servo Pulser problem

    hey

    im trying to do this
    http://www.uoguelph.ca/~antoon/gadgets/servo3.htm
    http://www.uoguelph.ca/~antoon/gadgets/servo3.gif

    but i faced a problem

    i bought all these
    IC1 = LM555 Timer R1 = 2K7
    R2 = 68K
    C2 = 100nF
    C3 = 100nF D1 = 1N4148, signal diode

    but they dont have this
    C1 = 390nF AND P1 = 2K7, potentiometer

    the seller told me that they dont sell 390nF AND 2K7, potentiometer

    so any one can help me?

  2. #2
    malc-c's Avatar
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    So you chose to make that one rather than Alaine version ( http://www.picbasic.co.uk/forum/atta...8&d=1169308729 )

    I use RS components here in the UK and they don't list 390nF value. I'm sure for your purpose a 400nf capacitor would suit. Likewise a 5K trim pot could be used, but you may not need to use all the range to get the 1ms - 2ms pulse width.

  3. #3
    malc-c's Avatar
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    As this forum is really about Pic programming, why not look at using a PIC to do the job for you. Here's some links I found

    http://www.dougrice.plus.com/hp/RCservo/rcservo.htm
    (includes HEX code and is simple to build)

    http://www.rc-cam.com/servotst.htm
    (Hex and documents for download)

    http://www.electronics-lab.com/proje...008/index.html
    (Asm and schematics)

    From the same site as your original servo pulser have a look at this one
    http://www.uoguelph.ca/~antoon/gadgets/servo2.htm
    It uses more standard values

    As does this version
    http://www.uoguelph.ca/~antoon/circ/archive/servo1.htm

    Another 555 timer based servo tester
    http://www.hobbyengineering.com/appServoTester.html

    And another
    http://hometown.aol.com/hprinzler/9610-03a.gif

    I could go on.. but I have other things I need to do. Just type in NE555 Servo tester into any search engine if you want more

  4. #4
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    Quote Originally Posted by al000y View Post
    hey

    im trying to do this
    http://www.uoguelph.ca/~antoon/gadgets/servo3.htm
    http://www.uoguelph.ca/~antoon/gadgets/servo3.gif

    but i faced a problem

    i bought all these
    IC1 = LM555 Timer R1 = 2K7
    R2 = 68K
    C2 = 100nF
    C3 = 100nF D1 = 1N4148, signal diode

    but they dont have this
    C1 = 390nF AND P1 = 2K7, potentiometer

    the seller told me that they dont sell 390nF AND 2K7, potentiometer

    so any one can help me?
    Aly,

    The total value of the cap must be .82µF ... on the drawing you had 3 possibilities INCLUDING 0.47 // 0.33 µF !!! There's enough room on the pcb to place 2 caps ...

    If you use a twin 4.7K pot ( the 2 sections wired in // ) that will fit perfectly.

    I use for this design an old 1 channel stick fitted with 4k7 pot ... but here, only 90° of rotation was used ...


    Malc ... you begin to look like "Jetpr" ... R = R1*R2/( R1+R2 ) and C1//C2 = C1+C2 sounds sthg for you ???

    Alain
    Last edited by Acetronics2; - 23rd January 2007 at 15:51.
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************

  5. #5
    Join Date
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    hey

    first can you give me link for beginner tutorial in electronics

    second yestrday i bought all these(in attach pic)

    1-68K R
    2-100nF
    3-330nF (also they have 400nF but they dont have 390nF)
    4-NE555P
    5-2.7K R
    6-IN4148
    7-P1 - 2.2K (they dont have 2.7 he said 2.2 is standard)


    if i build the project with these it will work fine and generate 1 - 2 ms ~ 50Hz ?
    or it will damage my ESC?
    Attached Images Attached Images  

  6. #6
    Join Date
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    just a simple test with 180f452 on microchip proto board
    servo connected to port B.7

    a quick test - without any additional hardware
    fyi

    init:
    gosub rstml
    loop:
    LCDOUT $FE, $80, " test for servo "

    if code <100 then code = 100

    if code >200 then code = 200

    if portB.0 = 0 then ' button right
    code = 100
    pulsout portB.7, code
    high portB.0
    else
    low portB.0
    endif

    if portA.4 = 0 then ' button left
    code = 200
    pulsout portB.7, code
    high portB.1
    else
    low portB.1
    endif

    high portB.2
    pause 25
    low portB.2
    pause 25
    goto loop

    rstml:
    low PORTB.1
    low PORTB.2
    low PORTB.3
    low PORTB.4
    low PORTB.5
    low PORTA.0
    return

  7. #7
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    Wink Some kind of apologies ...

    Hi, Al

    If you had told us electronics was a new land for you ... I had shown you THAT :

    http://www.york-electronics.com/

    Still time to be reasonnable ... and do not tell me about the cost !!!

    Alain

    For others:

    You REALLY think our friend could achieve an unprogrammed PIC "kit" ... as a simple 555 is a great problem.

    do not joke ... please !!!
    Last edited by Acetronics2; - 24th January 2007 at 09:47.
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************

  8. #8
    malc-c's Avatar
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    I thought the guy wanted to build something, rather than purchase a commercial product..

    Mind you at $20 it would probably be just as cheap !

  9. #9
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    Quote Originally Posted by malc-c View Post
    I thought the guy wanted to build something, rather than purchase a commercial product..

    Mind you at $20 it would probably be just as cheap !

    I know that, Malc ...

    but this device really is a value !!! ( I know "Rocky", it's him, for quite a while and his work is worth every $$ ... )

    Be sure this device is far off from your "miracle" bass beat filter ... ( LOL !!! )

    and as many things could be done with the 555 ...

    better to excercise on a blinking light or a standalone kit than taking risks with other stuff involved.

    Alain
    ************************************************** ***********************
    Why insist on using 32 Bits when you're not even able to deal with the first 8 ones ??? ehhhhhh ...
    ************************************************** ***********************
    IF there is the word "Problem" in your question ...
    certainly the answer is " RTFM " or " RTFDataSheet " !!!
    *****************************************

  10. #10
    malc-c's Avatar
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    Quote Originally Posted by Acetronics View Post
    .... your "miracle" bass beat filter ... ( LOL !!! )

    Alain
    Don't knock it... by the time I've finished playing with these op-amps I'll be the guru on low pass peak detection filters

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