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midi opto-isolators and oh my god what have I gotten myself into... — Parallax Forums

midi opto-isolators and oh my god what have I gotten myself into...

ArchiverArchiver Posts: 46,084
edited 2003-11-12 23:27 in General Discussion
I was under the impression that you didn't actually need an
opto-isolator for this to actually run..? I had only heard of it
trhough another reply from an earlier thread. I haven't found any
information anywhere else that says you need one in order for the
whole basic stamp midi setup to actually run...

Well, If it is required to run, anyone know a place that sells'em
cheap? Parallax doesn't seem to have any...

and if I have been entirely mistaken and have read this wropng, that I
actually don't need an opto-isolator, then it's gotta either be a
problem with the code or hardware or both. I updated my basic
schematic for this whole thing. It might be a bit "off", as I only got
into this stuff a few months ago, and haven't ironed everything out
(like the symbol for a flex sensor). Anyways, here it is.
http://hybrid.concordia.
ca/~Slynky/dfar398/page/midiwear/updatedmidiwear.html

Me and a techie went over it, and couldn't really find anything too
wrong with the whole thing. Finally found a 220 ohm resistor and put
gave it to the midi cable pin requiring the power. The code, however,
even he couldn't figure out, but we still gave it a shot (several
hours of shots actually), and came out with nothing. We came up with
two variations, neither of which ended up working. They're linked
here.
http://hybrid.concordia.ca/~Slynky/dfar398/midi1.html
http://hybrid.concordia.ca/~Slynky/dfar398/midi2.html

I know no one has to do anything to help me, but I'm REALLY trying to
get this whole thing working, have been for almost 3 weeks now, with
absolutely no luck whatsoever. Me and Vahid (the tech) are really at a
loss for this. I've read up on several pages on p[noparse][[/noparse]eople's projects
that use this code and have it working. If anyone can help, maybe
point out the (hopefully just) one thing that's wrong with either the
hardware or code, it would be greatly appreciated. I figure I'm almost
there, I just can't find the finish line is all.

oh, and Jon, you rule, many thanks.


--- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
wrote:
> That really _shouldn't_ be a problem ... unless everything is on the
> ragged end of specifications. It's simply a current limiter for an
> opto-isolator.
>
> -- Jon Williams
> -- Applications Engineer, Parallax
> -- Dallas Office
>
>
>
Original Message
> From: r_couldrey [noparse][[/noparse]mailto:r_couldrey@y...]
> Sent: Thursday, November 06, 2003 2:11 PM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] resistor question regarding midi out from
stamp
>
>
> Out of curiosity, no matter what the code is, would using a 240ohm
> resistor where a 220 ohm resistor should be in regards to pin 4 on
the
> female midi interface, and a 200 ohm resistor where a 220ohm
resistor
> should be in regards to pin 5 on the female midi connection actually
> cause the whole thing to not work at all? I was merely working with
> what was available, I still figured I'd get something out of it...
was
> I grossly mistaken? thanks.
>
> ry
>
>
> --- In basicstamps@yahoogroups.com, "r_couldrey" <r_couldrey@y...>
> wrote:
> > okie dokie, currently have a bunch of wires all over my desk, and
> have
> > lost several thousand strands of hair in frustration over this
midi
> > setup. Scratched the idea of 15 potentiometers due to cost (about
> > 5$CAN per POT and plastic knob, !!!!) Trying to get a flex sensor
on
> a
> > stamp to be recognized as a midi controller within Reason, and
> cannot
> > for the life of me get it working. I've tried altering the
> parameters
> > within the code, but it isn't sending out any midi through pin 0
> from
> > the flex sensor on pin 1. I'm certain I have the hardware set up
> > correctly, but I'm pretty uncertain about how I've butchered this
> > code. Reason itself isn't detecting any midi information that I
can
> > see. If I've really blatantly messed anything up, it'd be great to
> > know, as I can't figure this out at all.
> >
> > a great many thanks in advance for any help. With any l,uck, I
won't
> > short circuit my Quattro in the meantime...
> >
> > ryan
>
>
>
> > 'constants, shouldn't change these
> > midibaudmode CON 32780 '31.25kb, 8n1, non-inverted, open
collector
> > 'for 14-bit controllers - controller 32 is lsb of controller 0,
etc.
> > controllerLSBoffset CON 32 'MIDI status bytes:
> > controller CON %10110000 + 0
> > noteon CON %10010000 + 0
> > pitchbend CON %11100000 + 0
> >
> > 'declare variables
> > value VAR Word 'holds the 16-bit value read from the pot
> > pin VAR Nib 'which pin/pot we are reading at the
moment
> > statusbyte VAR Byte 'MIDI status; controller, noteon, or
> pitchbend
> > data1 VAR Byte 'first data byte, eg. controller or note
> > number
> > data2 VAR Byte 'second MIDI data byte, eg. value or
> velocity
> >
> > 'user configuration - adjust these to suit you
> > 'DANGER - check your circuitry and configure pins accordingly!!
'set
> > unused pins to outputs DIRS = %1111111111111111 'all outs
> > OUTS = %0000000000000000 'all low
> > midichannel CON 1 'MIDI transmit channel
> > midioutpin CON 0 'pin connected to MIDI out connector
> > 'check the MIDI spec for a list of controller numbers you can use
> > controlleroffset CON 0 'add to pot's pin # to get MIDI controller
#
> > hipot CON 1 'highest pin with a pot to measure
> > lowpot CON 1 'lowest pin with a pot to measure
> >
> >
> > doit:
> > DEBUG HOME
> > FOR pin = lowpot TO hipot
> > 'read the value of the pot
> > HIGH 1
> > PAUSE 0
> > RCTIME 1, 1, value
> > DEBUG value, DEC pin, " reads ", DEC value, CR
> > value = value >> 1 'drop the least significant bit
> >
> > 'send most significant 7 bits as continuous controller msg
> > statusbyte = controller 'sending controller message
> > data1 = pin + controlleroffset 'controller #
> > data2 = value.HIGHBYTE
> > SEROUT data1, data2,[noparse][[/noparse]statusbyte, data1, data2]
> >
> > 'uncomment this section to send 14-bit controller data
> > 'send least significant 7 bits
> > data1 = data1 + controllerLSBoffset
> > data2 = value.LOWBYTE
> > data2 = data2 >> 1 'convert to 7 bits
> > 'use running status byte (can leave it out if unchanged)
> > SEROUT data1, data2, [noparse][[/noparse]data1, data2]
> > NEXT
> > GOTO doit
>
>
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Comments

  • ArchiverArchiver Posts: 46,084
    edited 2003-11-12 22:13
    The opto-isolator is in the midi equipment. It would seem logical that
    the resistor should already be there -- but if it isn't you may have a
    problem. Unless you have a schematic or desire to crack open your
    equipment, go with the 220 ohm resistor; they don't cost much.

    I wrote a two articles on MIDI with the BS2 for Nuts & Volts:

    http://www.parallax.com/dl/docs/cols/nv/vol4/col/94.pdf
    http://www.parallax.com/dl/docs/cols/nv/vol4/col/95.pdf

    You can download the BS2 souce for the articles from our web site.

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

    Original Message
    From: r_couldrey [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=IkrkZS5siSK9RE_1Wbo7ce8HWUjA1E7uY3NXafXiumILJgqKmR1Fdx1ROxnmpFDbc9KGXn46p0R9yg]r_couldrey@y...[/url
    Sent: Wednesday, November 12, 2003 1:23 PM
    To: basicstamps@yahoogroups.com
    Subject: [noparse][[/noparse]basicstamps] Re: midi opto-isolators and oh my god what have I
    gotten myself into...


    I was under the impression that you didn't actually need an
    opto-isolator for this to actually run..? I had only heard of it
    trhough another reply from an earlier thread. I haven't found any
    information anywhere else that says you need one in order for the
    whole basic stamp midi setup to actually run...

    Well, If it is required to run, anyone know a place that sells'em
    cheap? Parallax doesn't seem to have any...

    and if I have been entirely mistaken and have read this wropng, that I
    actually don't need an opto-isolator, then it's gotta either be a
    problem with the code or hardware or both. I updated my basic
    schematic for this whole thing. It might be a bit "off", as I only got
    into this stuff a few months ago, and haven't ironed everything out
    (like the symbol for a flex sensor). Anyways, here it is.
    http://hybrid.concordia.
    ca/~Slynky/dfar398/page/midiwear/updatedmidiwear.html

    Me and a techie went over it, and couldn't really find anything too
    wrong with the whole thing. Finally found a 220 ohm resistor and put
    gave it to the midi cable pin requiring the power. The code, however,
    even he couldn't figure out, but we still gave it a shot (several
    hours of shots actually), and came out with nothing. We came up with
    two variations, neither of which ended up working. They're linked
    here.
    http://hybrid.concordia.ca/~Slynky/dfar398/midi1.html
    http://hybrid.concordia.ca/~Slynky/dfar398/midi2.html

    I know no one has to do anything to help me, but I'm REALLY trying to
    get this whole thing working, have been for almost 3 weeks now, with
    absolutely no luck whatsoever. Me and Vahid (the tech) are really at a
    loss for this. I've read up on several pages on p[noparse][[/noparse]eople's projects
    that use this code and have it working. If anyone can help, maybe
    point out the (hopefully just) one thing that's wrong with either the
    hardware or code, it would be greatly appreciated. I figure I'm almost
    there, I just can't find the finish line is all.

    oh, and Jon, you rule, many thanks.


    --- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
    wrote:
    > That really _shouldn't_ be a problem ... unless everything is on the
    > ragged end of specifications. It's simply a current limiter for an
    > opto-isolator.
    >
    > -- Jon Williams
    > -- Applications Engineer, Parallax
    > -- Dallas Office
    >
    >
    >
    Original Message
    > From: r_couldrey [noparse][[/noparse]mailto:r_couldrey@y...]
    > Sent: Thursday, November 06, 2003 2:11 PM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] resistor question regarding midi out from
    stamp
    >
    >
    > Out of curiosity, no matter what the code is, would using a 240ohm
    > resistor where a 220 ohm resistor should be in regards to pin 4 on
    the
    > female midi interface, and a 200 ohm resistor where a 220ohm
    resistor
    > should be in regards to pin 5 on the female midi connection actually
    > cause the whole thing to not work at all? I was merely working with
    > what was available, I still figured I'd get something out of it...
    was
    > I grossly mistaken? thanks.
    >
    > ry
    >
    >
    > --- In basicstamps@yahoogroups.com, "r_couldrey" <r_couldrey@y...>
    > wrote:
    > > okie dokie, currently have a bunch of wires all over my desk, and
    > have
    > > lost several thousand strands of hair in frustration over this
    midi
    > > setup. Scratched the idea of 15 potentiometers due to cost (about
    > > 5$CAN per POT and plastic knob, !!!!) Trying to get a flex sensor
    on
    > a
    > > stamp to be recognized as a midi controller within Reason, and
    > cannot
    > > for the life of me get it working. I've tried altering the
    > parameters
    > > within the code, but it isn't sending out any midi through pin 0
    > from
    > > the flex sensor on pin 1. I'm certain I have the hardware set up
    > > correctly, but I'm pretty uncertain about how I've butchered this
    > > code. Reason itself isn't detecting any midi information that I
    can
    > > see. If I've really blatantly messed anything up, it'd be great to
    > > know, as I can't figure this out at all.
    > >
    > > a great many thanks in advance for any help. With any l,uck, I
    won't
    > > short circuit my Quattro in the meantime...
    > >
    > > ryan
    >
    >
    >
    > > 'constants, shouldn't change these
    > > midibaudmode CON 32780 '31.25kb, 8n1, non-inverted, open
    collector
    > > 'for 14-bit controllers - controller 32 is lsb of controller 0,
    etc.
    > > controllerLSBoffset CON 32 'MIDI status bytes:
    > > controller CON %10110000 + 0
    > > noteon CON %10010000 + 0
    > > pitchbend CON %11100000 + 0
    > >
    > > 'declare variables
    > > value VAR Word 'holds the 16-bit value read from the pot
    > > pin VAR Nib 'which pin/pot we are reading at the
    moment
    > > statusbyte VAR Byte 'MIDI status; controller, noteon, or
    > pitchbend
    > > data1 VAR Byte 'first data byte, eg. controller or note
    > > number
    > > data2 VAR Byte 'second MIDI data byte, eg. value or
    > velocity
    > >
    > > 'user configuration - adjust these to suit you
    > > 'DANGER - check your circuitry and configure pins accordingly!!
    'set
    > > unused pins to outputs DIRS = %1111111111111111 'all outs OUTS =
    > > %0000000000000000 'all low
    > > midichannel CON 1 'MIDI transmit channel
    > > midioutpin CON 0 'pin connected to MIDI out connector
    > > 'check the MIDI spec for a list of controller numbers you can use
    > > controlleroffset CON 0 'add to pot's pin # to get MIDI controller
    #
    > > hipot CON 1 'highest pin with a pot to measure
    > > lowpot CON 1 'lowest pin with a pot to measure
    > >
    > >
    > > doit:
    > > DEBUG HOME
    > > FOR pin = lowpot TO hipot
    > > 'read the value of the pot
    > > HIGH 1
    > > PAUSE 0
    > > RCTIME 1, 1, value
    > > DEBUG value, DEC pin, " reads ", DEC value, CR
    > > value = value >> 1 'drop the least significant bit
    > >
    > > 'send most significant 7 bits as continuous controller msg
    > > statusbyte = controller 'sending controller message
    > > data1 = pin + controlleroffset 'controller #
    > > data2 = value.HIGHBYTE
    > > SEROUT data1, data2,[noparse][[/noparse]statusbyte, data1, data2]
    > >
    > > 'uncomment this section to send 14-bit controller data
    > > 'send least significant 7 bits
    > > data1 = data1 + controllerLSBoffset
    > > data2 = value.LOWBYTE
    > > data2 = data2 >> 1 'convert to 7 bits
    > > 'use running status byte (can leave it out if unchanged)
    > > SEROUT data1, data2, [noparse][[/noparse]data1, data2]
    > > NEXT
    > > GOTO doit
    >
    >
    > 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.


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  • ArchiverArchiver Posts: 46,084
    edited 2003-11-12 23:27
    I'm pretty sure that to be to midi "spec", each component with a midi port
    on it has to be opto-isolated, presumably so that stray voltage from
    either the BS2 side or the midi equipment side doesn't flow down the bus
    and fry something.

    But no, you don't need it, just a couple of 220 ohm resistors. My
    'practical' experience with midi seems to indicate that 32768 baud works
    better than 31250, which is the 'official' rate. (unless 31.25kbd means
    31.25*1024, or 32000.)

    On Wed, 12 Nov 2003, Jon Williams wrote:

    > The opto-isolator is in the midi equipment. It would seem logical that
    > the resistor should already be there -- but if it isn't you may have a
    > problem. Unless you have a schematic or desire to crack open your
    > equipment, go with the 220 ohm resistor; they don't cost much.
    >
    > I wrote a two articles on MIDI with the BS2 for Nuts & Volts:
    >
    > http://www.parallax.com/dl/docs/cols/nv/vol4/col/94.pdf
    > http://www.parallax.com/dl/docs/cols/nv/vol4/col/95.pdf
    >
    > You can download the BS2 souce for the articles from our web site.
    >
    > -- Jon Williams
    > -- Applications Engineer, Parallax
    > -- Dallas Office
    >
    >
    >
    Original Message
    > From: r_couldrey [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=TPrkAs3cO--W2osr64ABU_HnRR3dlHWYvgY-RwdPy-hYMP1VIgJWbPPFz3Vf-2gEenp2BGa6lq-dnrU]r_couldrey@y...[/url
    > Sent: Wednesday, November 12, 2003 1:23 PM
    > To: basicstamps@yahoogroups.com
    > Subject: [noparse][[/noparse]basicstamps] Re: midi opto-isolators and oh my god what have I
    > gotten myself into...
    >
    >
    > I was under the impression that you didn't actually need an
    > opto-isolator for this to actually run..? I had only heard of it
    > trhough another reply from an earlier thread. I haven't found any
    > information anywhere else that says you need one in order for the
    > whole basic stamp midi setup to actually run...
    >
    > Well, If it is required to run, anyone know a place that sells'em
    > cheap? Parallax doesn't seem to have any...
    >
    > and if I have been entirely mistaken and have read this wropng, that I
    > actually don't need an opto-isolator, then it's gotta either be a
    > problem with the code or hardware or both. I updated my basic
    > schematic for this whole thing. It might be a bit "off", as I only got
    > into this stuff a few months ago, and haven't ironed everything out
    > (like the symbol for a flex sensor). Anyways, here it is.
    > http://hybrid.concordia.
    > ca/~Slynky/dfar398/page/midiwear/updatedmidiwear.html
    >
    > Me and a techie went over it, and couldn't really find anything too
    > wrong with the whole thing. Finally found a 220 ohm resistor and put
    > gave it to the midi cable pin requiring the power. The code, however,
    > even he couldn't figure out, but we still gave it a shot (several
    > hours of shots actually), and came out with nothing. We came up with
    > two variations, neither of which ended up working. They're linked
    > here.
    > http://hybrid.concordia.ca/~Slynky/dfar398/midi1.html
    > http://hybrid.concordia.ca/~Slynky/dfar398/midi2.html
    >
    > I know no one has to do anything to help me, but I'm REALLY trying to
    > get this whole thing working, have been for almost 3 weeks now, with
    > absolutely no luck whatsoever. Me and Vahid (the tech) are really at a
    > loss for this. I've read up on several pages on p[noparse][[/noparse]eople's projects
    > that use this code and have it working. If anyone can help, maybe
    > point out the (hopefully just) one thing that's wrong with either the
    > hardware or code, it would be greatly appreciated. I figure I'm almost
    > there, I just can't find the finish line is all.
    >
    > oh, and Jon, you rule, many thanks.
    >
    >
    > --- In basicstamps@yahoogroups.com, "Jon Williams" <jwilliams@p...>
    > wrote:
    > > That really _shouldn't_ be a problem ... unless everything is on the
    > > ragged end of specifications. It's simply a current limiter for an
    > > opto-isolator.
    > >
    > > -- Jon Williams
    > > -- Applications Engineer, Parallax
    > > -- Dallas Office
    > >
    > >
    > >
    Original Message
    > > From: r_couldrey [noparse][[/noparse]mailto:r_couldrey@y...]
    > > Sent: Thursday, November 06, 2003 2:11 PM
    > > To: basicstamps@yahoogroups.com
    > > Subject: [noparse][[/noparse]basicstamps] resistor question regarding midi out from
    > stamp
    > >
    > >
    > > Out of curiosity, no matter what the code is, would using a 240ohm
    > > resistor where a 220 ohm resistor should be in regards to pin 4 on
    > the
    > > female midi interface, and a 200 ohm resistor where a 220ohm
    > resistor
    > > should be in regards to pin 5 on the female midi connection actually
    > > cause the whole thing to not work at all? I was merely working with
    > > what was available, I still figured I'd get something out of it...
    > was
    > > I grossly mistaken? thanks.
    > >
    > > ry
    > >
    > >
    > > --- In basicstamps@yahoogroups.com, "r_couldrey" <r_couldrey@y...>
    > > wrote:
    > > > okie dokie, currently have a bunch of wires all over my desk, and
    > > have
    > > > lost several thousand strands of hair in frustration over this
    > midi
    > > > setup. Scratched the idea of 15 potentiometers due to cost (about
    > > > 5$CAN per POT and plastic knob, !!!!) Trying to get a flex sensor
    > on
    > > a
    > > > stamp to be recognized as a midi controller within Reason, and
    > > cannot
    > > > for the life of me get it working. I've tried altering the
    > > parameters
    > > > within the code, but it isn't sending out any midi through pin 0
    > > from
    > > > the flex sensor on pin 1. I'm certain I have the hardware set up
    > > > correctly, but I'm pretty uncertain about how I've butchered this
    > > > code. Reason itself isn't detecting any midi information that I
    > can
    > > > see. If I've really blatantly messed anything up, it'd be great to
    > > > know, as I can't figure this out at all.
    > > >
    > > > a great many thanks in advance for any help. With any l,uck, I
    > won't
    > > > short circuit my Quattro in the meantime...
    > > >
    > > > ryan
    > >
    > >
    > >
    > > > 'constants, shouldn't change these
    > > > midibaudmode CON 32780 '31.25kb, 8n1, non-inverted, open
    > collector
    > > > 'for 14-bit controllers - controller 32 is lsb of controller 0,
    > etc.
    > > > controllerLSBoffset CON 32 'MIDI status bytes:
    > > > controller CON %10110000 + 0
    > > > noteon CON %10010000 + 0
    > > > pitchbend CON %11100000 + 0
    > > >
    > > > 'declare variables
    > > > value VAR Word 'holds the 16-bit value read from the pot
    > > > pin VAR Nib 'which pin/pot we are reading at the
    > moment
    > > > statusbyte VAR Byte 'MIDI status; controller, noteon, or
    > > pitchbend
    > > > data1 VAR Byte 'first data byte, eg. controller or note
    > > > number
    > > > data2 VAR Byte 'second MIDI data byte, eg. value or
    > > velocity
    > > >
    > > > 'user configuration - adjust these to suit you
    > > > 'DANGER - check your circuitry and configure pins accordingly!!
    > 'set
    > > > unused pins to outputs DIRS = %1111111111111111 'all outs OUTS =
    > > > %0000000000000000 'all low
    > > > midichannel CON 1 'MIDI transmit channel
    > > > midioutpin CON 0 'pin connected to MIDI out connector
    > > > 'check the MIDI spec for a list of controller numbers you can use
    > > > controlleroffset CON 0 'add to pot's pin # to get MIDI controller
    > #
    > > > hipot CON 1 'highest pin with a pot to measure
    > > > lowpot CON 1 'lowest pin with a pot to measure
    > > >
    > > >
    > > > doit:
    > > > DEBUG HOME
    > > > FOR pin = lowpot TO hipot
    > > > 'read the value of the pot
    > > > HIGH 1
    > > > PAUSE 0
    > > > RCTIME 1, 1, value
    > > > DEBUG value, DEC pin, " reads ", DEC value, CR
    > > > value = value >> 1 'drop the least significant bit
    > > >
    > > > 'send most significant 7 bits as continuous controller msg
    > > > statusbyte = controller 'sending controller message
    > > > data1 = pin + controlleroffset 'controller #
    > > > data2 = value.HIGHBYTE
    > > > SEROUT data1, data2,[noparse][[/noparse]statusbyte, data1, data2]
    > > >
    > > > 'uncomment this section to send 14-bit controller data
    > > > 'send least significant 7 bits
    > > > data1 = data1 + controllerLSBoffset
    > > > data2 = value.LOWBYTE
    > > > data2 = data2 >> 1 'convert to 7 bits
    > > > 'use running status byte (can leave it out if unchanged)
    > > > SEROUT data1, data2, [noparse][[/noparse]data1, data2]
    > > > NEXT
    > > > GOTO doit
    > >
    > >
    > > 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.
    > >
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    Sean T. Lamont, CTO / Chief NetNerd, Abstract Software, Inc. (ServNet)
    Seattle - Bellingham - Vancouver - Portland - Everett - Tacoma - Bremerton
    email: lamont@a... WWW: http://www.serv.net
    "Do not fear mistakes, There Are None" - Miles Davis
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