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Joystick interface basics — Parallax Forums

Joystick interface basics

ArchiverArchiver Posts: 46,084
edited 2003-10-29 03:00 in General Discussion
I'd like to hook a Joystick up to a BS2 to control 2 servos for a
tilt/pan application. Has anyone done this before? I searched
online and on LOSA for source code and all I found were dead links.
Thanks!

Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-10-28 18:50
    It's pretty easy to do with an old analog joystick. Take a look at this
    article from Nuts & Volts:

    http://www.parallax.com/dl/docs/cols/nv/vol2/col/70.pdf

    -- Jon Williams
    -- Applications Engineer, Parallax
    -- Dallas Office

    Original Message
    From: Chris Drzewiecki [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=EiJy-Z4WLrfT1MIfmKnTdlPKLf2ftikbdnMh_AdBpkkXvJnntwseviZ9NTqTDbkcuRaUUwpT-ZhLr10]crd75@a...[/url
    Sent: Tuesday, October 28, 2003 12:24 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Joystick interface basics


    I'd like to hook a Joystick up to a BS2 to control 2 servos for a
    tilt/pan application. Has anyone done this before? I searched
    online and on LOSA for source code and all I found were dead links.
    Thanks!



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  • ArchiverArchiver Posts: 46,084
    edited 2003-10-28 20:03
    Thanks. How accurate is the positioning with it? Also would a BS2
    be able to control 2 independent servos?

    --- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
    wrote:
    > It's pretty easy to do with an old analog joystick. Take a look
    at this
    > article from Nuts & Volts:
    >
    > http://www.parallax.com/dl/docs/cols/nv/vol2/col/70.pdf
    >
    > -- Jon Williams
    > -- Applications Engineer, Parallax
    > -- Dallas Office
    >
    >
    >
    Original Message
    > From: Chris Drzewiecki [noparse][[/noparse]mailto:crd75@a...]
    > Sent: Tuesday, October 28, 2003 12:24 PM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] Joystick interface basics
    >
    >
    > I'd like to hook a Joystick up to a BS2 to control 2 servos for a
    > tilt/pan application. Has anyone done this before? I searched
    > online and on LOSA for source code and all I found were dead
    links.
    > Thanks!
    >
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the
    Subject
    > and Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to
    > http://docs.yahoo.com/info/terms/
    >
    >
    >
    >
    > This message has been scanned by WebShield. Please report SPAM to
    > abuse@p...
  • ArchiverArchiver Posts: 46,084
    edited 2003-10-28 22:06
    The accuracy will depend on the joystick pots and the A/D used. Instead
    of RCTIME, you could use a two-channel ADC like the LTC1298. You can
    use PULSOUT to update your servos...like this:

    Update_Servos:
    PULSOUT Servo1, s1width
    PULSOUT Servo2, s2width
    PAUSE 10
    RETURN

    At its worst case, this subroutine should take about 15 ms to run --
    this gives you 5 ms to read the joystick and calculate the servo values.
    Now, truthfully, if you just want to make a couple of servos follow a
    joystick, you can do it with a couple of 556 timer chips and discrete
    parts. If you want to do it in a micro and do it "on the cheap" you
    could certainly use the BS1 which is making a come-back with a new
    Windows editor to be released shortly.

    -- Jon Williams
    -- Applications Engineer, Parallax
    -- Dallas Office

    Original Message
    From: Chris Drzewiecki [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=HeVsee_L9Y0cLAcwdhsWxg7sxmZvj6iGuhK1M__IwocOKIHR2z_UsL8s4vyFuMBvAbiuT8TxMMpO3ngT2Q]crd75@a...[/url
    Sent: Tuesday, October 28, 2003 2:03 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Re: Joystick interface basics


    Thanks. How accurate is the positioning with it? Also would a BS2
    be able to control 2 independent servos?

    --- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
    wrote:
    > It's pretty easy to do with an old analog joystick. Take a look
    at this
    > article from Nuts & Volts:
    >
    > http://www.parallax.com/dl/docs/cols/nv/vol2/col/70.pdf
    >
    > -- Jon Williams
    > -- Applications Engineer, Parallax
    > -- Dallas Office
    >
    >
    >
    Original Message
    > From: Chris Drzewiecki [noparse][[/noparse]mailto:crd75@a...]
    > Sent: Tuesday, October 28, 2003 12:24 PM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] Joystick interface basics
    >
    >
    > I'd like to hook a Joystick up to a BS2 to control 2 servos for a
    > tilt/pan application. Has anyone done this before? I searched
    > online and on LOSA for source code and all I found were dead
    links.
    > Thanks!
    >
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the
    Subject
    > and Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to
    > http://docs.yahoo.com/info/terms/
    >
    >
    >
    >
    > This message has been scanned by WebShield. Please report SPAM to
    > abuse@p...


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  • ArchiverArchiver Posts: 46,084
    edited 2003-10-29 03:00
    Well, I already have a BS2 with a BOE so if I can use that without
    getting much more it would be great. Basically, I do want the 2
    servos to follow the joystick. And eventually making it a wireless
    connection. I want to use one of the buttons on the joystick to
    trigger a switch that's hooked up to an electronic trigger on a
    paintball gun. Basically it's going to be a remote controlled
    turret that will eventually be phased into a robot rover. Sounds
    crazy, huh [noparse]:)[/noparse]


    --- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
    wrote:
    > The accuracy will depend on the joystick pots and the A/D used.
    Instead
    > of RCTIME, you could use a two-channel ADC like the LTC1298. You
    can
    > use PULSOUT to update your servos...like this:
    >
    > Update_Servos:
    > PULSOUT Servo1, s1width
    > PULSOUT Servo2, s2width
    > PAUSE 10
    > RETURN
    >
    > At its worst case, this subroutine should take about 15 ms to run -
    -
    > this gives you 5 ms to read the joystick and calculate the servo
    values.
    > Now, truthfully, if you just want to make a couple of servos
    follow a
    > joystick, you can do it with a couple of 556 timer chips and
    discrete
    > parts. If you want to do it in a micro and do it "on the cheap"
    you
    > could certainly use the BS1 which is making a come-back with a new
    > Windows editor to be released shortly.
    >
    > -- Jon Williams
    > -- Applications Engineer, Parallax
    > -- Dallas Office
    >
    >
    >
    Original Message
    > From: Chris Drzewiecki [noparse][[/noparse]mailto:crd75@a...]
    > Sent: Tuesday, October 28, 2003 2:03 PM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] Re: Joystick interface basics
    >
    >
    > Thanks. How accurate is the positioning with it? Also would a
    BS2
    > be able to control 2 independent servos?
    >
    > --- In basicstamps@yahoogroups.com, "Jon Williams"
    <jwilliams@p...>
    > wrote:
    > > It's pretty easy to do with an old analog joystick. Take a look
    > at this
    > > article from Nuts & Volts:
    > >
    > > http://www.parallax.com/dl/docs/cols/nv/vol2/col/70.pdf
    > >
    > > -- Jon Williams
    > > -- Applications Engineer, Parallax
    > > -- Dallas Office
    > >
    > >
    > >
    Original Message
    > > From: Chris Drzewiecki [noparse][[/noparse]mailto:crd75@a...]
    > > Sent: Tuesday, October 28, 2003 12:24 PM
    > > To: basicstamps@yahoogroups.com
    > > Subject: [noparse][[/noparse]basicstamps] Joystick interface basics
    > >
    > >
    > > I'd like to hook a Joystick up to a BS2 to control 2 servos for a
    > > tilt/pan application. Has anyone done this before? I searched
    > > online and on LOSA for source code and all I found were dead
    > links.
    > > Thanks!
    > >
    > >
    > >
    > > To UNSUBSCRIBE, just send mail to:
    > > basicstamps-unsubscribe@yahoogroups.com
    > > from the same email address that you subscribed. Text in the
    > Subject
    > > and Body of the message will be ignored.
    > >
    > >
    > > Your use of Yahoo! Groups is subject to
    > > http://docs.yahoo.com/info/terms/
    > >
    > >
    > >
    > >
    > > This message has been scanned by WebShield. Please report SPAM
    to
    > > abuse@p...
    >
    >
    > To UNSUBSCRIBE, just send mail to:
    > basicstamps-unsubscribe@yahoogroups.com
    > from the same email address that you subscribed. Text in the
    Subject
    > and Body of the message will be ignored.
    >
    >
    > Your use of Yahoo! Groups is subject to
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    >
    >
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    >
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    > abuse@p...
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