Need more pots
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Posts: 46,084
Hello ,I am Corne, a new basicstamp-freak
i am building a midi-controller , and have 1 question.????
who knows how I can use more pots with stamp2
I have already a lot of knobs and leds with the use of 74hc165/74hc595 , now
I need more pots and faders for my midi-mixer.
already ports in use:
3 in for knobs
3 out for leds
1 out for midi out
I can use the other 9 for pots or faders but wanted more faders/pots ????
thanks !!!!!!!!!!!!!! CORNE
[noparse][[/noparse]Non-text portions of this message have been removed]
i am building a midi-controller , and have 1 question.????
who knows how I can use more pots with stamp2
I have already a lot of knobs and leds with the use of 74hc165/74hc595 , now
I need more pots and faders for my midi-mixer.
already ports in use:
3 in for knobs
3 out for leds
1 out for midi out
I can use the other 9 for pots or faders but wanted more faders/pots ????
thanks !!!!!!!!!!!!!! CORNE
[noparse][[/noparse]Non-text portions of this message have been removed]
Comments
1. ADC0831 is an 8-pin dip, reads one 0..5V signal,
needs 2 Stamp pins, has 8-bit resolution (255 steps)
2. ADC0832 is same package, reads two 0..5V signals,
same 2 Stamp pins.
3. The ADC08xx family does have a package which has
8 A/D converters in it, same 2 Stamp pins.
4. Any other off the shelf A/D converter which supports
'SPI' (serial peripheral interface).
Or:
You can use the RCTime command, with a capacitor
for each channel -- see the manual, but this takes
one I/O pin per Analog signal.
--- In basicstamps@yahoogroups.com, "Schijndel197"
<schijndel197@z...> wrote:
> Hello ,I am Corne, a new basicstamp-freak
>
> i am building a midi-controller , and have 1 question.????
>
> who knows how I can use more pots with stamp2
>
> I have already a lot of knobs and leds with the use of
74hc165/74hc595 , now
> I need more pots and faders for my midi-mixer.
>
> already ports in use:
> 3 in for knobs
> 3 out for leds
> 1 out for midi out
>
> I can use the other 9 for pots or faders but wanted more
faders/pots ????
>
>
> thanks !!!!!!!!!!!!!! CORNE
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
The easiest way is to get an A/D converter with as many inputs as possible.
Look at the Maxim website, they make lots of A/Ds, and I know they have one
with 8 channels at least. Each A/D will take two pins from your Stamp.
Hope this helps,
Jonathan
www.madlabs.info
Original Message
From: "Schijndel197" <schijndel197@z...>
To: <basicstamps@yahoogroups.com>
Sent: Sunday, March 09, 2003 5:25 AM
Subject: [noparse][[/noparse]basicstamps] NEED MORE POTS
> Hello ,I am Corne, a new basicstamp-freak
>
> i am building a midi-controller , and have 1 question.????
>
> who knows how I can use more pots with stamp2
>
> I have already a lot of knobs and leds with the use of 74hc165/74hc595 ,
now
> I need more pots and faders for my midi-mixer.
>
> already ports in use:
> 3 in for knobs
> 3 out for leds
> 1 out for midi out
>
> I can use the other 9 for pots or faders but wanted more faders/pots ????
>
>
> thanks !!!!!!!!!!!!!! CORNE
>
>
> [noparse][[/noparse]Non-text portions of this message have been removed]
>
>
> 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/
>
>
>
>
You already have the basic knowledge tools you need to make
a simple multiplexing scheme for multiple POTS. You stated your
use of a 74165 which is an 8-bit input P2S. Reverse of that, what
you can use is a 74164 which is an 8-bit output S2P. Now here is
where I'm going with this... Looking at one of the BS2 pdf
manuals on using POTS you basically have a circuit as follows....
220
I/O >---/\/\---o
.1uF | 10K
+5V >----||----o----/\/\----o
|
o
< GND
...Now, imagine what it would take to multiplex this circuit,
consider two identical circuits
220
I/O >---/\/\---o
.1uF | 10K
+5V >----||----o----/\/\----o
|
o
< GND
|
+5V >----||----o----/\/\----o
.1uF | 10K
I/O >---/\/\---o
220
...The idea is to look for COMMON nodes that can be "broken" and
tied into a 74164 for individual control. Now you say, but I don't
want a separate 220 Ohm resistor and a capacitor for each POT I want
to instantiate. Fine, you can simplify this circuit into using only
one 220 Ohm, one Capacitor, up to 8 pots, and one 74164 IC with the
addition of one diode per POT (maximum 8 diodes)
220
I/O >---/\/\---o
.1uF | 10K
+5V >----||----o----/\/\----o
| | D1
| o
>|
< 74164 Output 1
|
| 10K
o----/\/\----o
| | D2
| o
>|
< 74164 Output 2
|
| 10K
o----/\/\----o
| | D3
| o
>|
< 74164 Output 3
|
| 10K
o----/\/\----o
| | D4
| o
>|
< 74164 Output 4
|
| 10K
o----/\/\----o
| | D5
| o
>|
< 74164 Output 5
|
| 10K
o----/\/\----o
| | D6
| o
>|
< 74164 Output 6
|
| 10K
o----/\/\----o
| | D7
| o
>|
< 74164 Output 7
|
| 10K
o----/\/\----o
| D8
o
>|
< 74164 Output 8
D1-D8 generic (Rat-Shack 50 pack)
Design Note:
If you have long leads (> 6 inches) between 74164 and POTS,
use twisted pair with one connection tied to ground, keeping
diodes close to POT. Keep 220 Ohm resistor and .1uF CAP close
to BS2 I/O. Also use twisted pair from here to POTS and
connect one terminal of the twisted pair to ground if POTS are
more that 6 inches away.
Program Note:
The only thing you need to be aware of in "code" is to ensure
that ONLY one output of the 74164 is LOW at a time before you
read the POT, otherwise for each pin of the 74164 that is LOW,
you will be reading a combination of those POTS in parallel.
....However that could be a desired effect dependign on your
application.
Have fun!!
Beau Schwabe
> Corne,
>
> The easiest way is to get an A/D converter with as many inputs as
possible.
> Look at the Maxim website, they make lots of A/Ds, and I know they
have one
> with 8 channels at least. Each A/D will take two pins from your Stamp.
>
> Hope this helps,
>
> Jonathan
>
> www.madlabs.info
>
>
Original Message
> From: "Schijndel197" <schijndel197@z...>
> To: <basicstamps@yahoogroups.com>
> Sent: Sunday, March 09, 2003 5:25 AM
> Subject: [noparse][[/noparse]basicstamps] NEED MORE POTS
>
>
> > Hello ,I am Corne, a new basicstamp-freak
> >
> > i am building a midi-controller , and have 1 question.????
> >
> > who knows how I can use more pots with stamp2
> >
> > I have already a lot of knobs and leds with the use of
74hc165/74hc595 ,
> now
> > I need more pots and faders for my midi-mixer.
> >
> > already ports in use:
> > 3 in for knobs
> > 3 out for leds
> > 1 out for midi out
> >
> > I can use the other 9 for pots or faders but wanted more
faders/pots ????
> >
> >
> > thanks !!!!!!!!!!!!!! CORNE
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
> >
> >
> > 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/
> >
> >
> >
> >
but as you add more ADCs they each only need one pin. Din, Dout, and clock
can be shared, only CS needs a seperate pin per ADC.
My 'lectronic Newb site http://members.shaw.ca/pmeloy/
Original Message
From: "Jonathan Peakall" <jpeakall@m...>
To: <basicstamps@yahoogroups.com>
Sent: Sunday, March 09, 2003 6:51 AM
Subject: Re: [noparse][[/noparse]basicstamps] NEED MORE POTS
> Corne,
>
> The easiest way is to get an A/D converter with as many inputs as
possible.
> Look at the Maxim website, they make lots of A/Ds, and I know they have
one
> with 8 channels at least. Each A/D will take two pins from your Stamp.
>
> Hope this helps,
>
> Jonathan
>
> www.madlabs.info
>
>
Original Message
> From: "Schijndel197" <schijndel197@z...>
> To: <basicstamps@yahoogroups.com>
> Sent: Sunday, March 09, 2003 5:25 AM
> Subject: [noparse][[/noparse]basicstamps] NEED MORE POTS
>
>
> > Hello ,I am Corne, a new basicstamp-freak
> >
> > i am building a midi-controller , and have 1 question.????
> >
> > who knows how I can use more pots with stamp2
> >
> > I have already a lot of knobs and leds with the use of 74hc165/74hc595 ,
> now
> > I need more pots and faders for my midi-mixer.
> >
> > already ports in use:
> > 3 in for knobs
> > 3 out for leds
> > 1 out for midi out
> >
> > I can use the other 9 for pots or faders but wanted more faders/pots
????
> >
> >
> > thanks !!!!!!!!!!!!!! CORNE
> >
> >
> > [noparse][[/noparse]Non-text portions of this message have been removed]
> >
> >
> > 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/
> >
> >
> >
> >
>
>
> 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/
>
>
I noticed the ASCII Art did not go through correctly on my last post,
so here is a link to a schematic for an 8-POT 3-I/O design....
http://www.angelfire.com/wizard/y2kbc/schematic/8P3IO.gif
...have fun!
Beau Schwabe
>
> > Corne,
> >
> > The easiest way is to get an A/D converter with as many inputs as
> possible.
> > Look at the Maxim website, they make lots of A/Ds, and I know they
> have one
> > with 8 channels at least. Each A/D will take two pins from your Stamp.
> >
> > Hope this helps,
> >
> > Jonathan
> >
> > www.madlabs.info
> >
> >
Original Message
> > From: "Schijndel197" <schijndel197@z...>
> > To: <basicstamps@yahoogroups.com>
> > Sent: Sunday, March 09, 2003 5:25 AM
> > Subject: [noparse][[/noparse]basicstamps] NEED MORE POTS
> >
> >
> > > Hello ,I am Corne, a new basicstamp-freak
> > >
> > > i am building a midi-controller , and have 1 question.????
> > >
> > > who knows how I can use more pots with stamp2
> > >
> > > I have already a lot of knobs and leds with the use of
> 74hc165/74hc595 ,
> > now
> > > I need more pots and faders for my midi-mixer.
> > >
> > > already ports in use:
> > > 3 in for knobs
> > > 3 out for leds
> > > 1 out for midi out
> > >
> > > I can use the other 9 for pots or faders but wanted more
> faders/pots ????
> > >
> > >
> > > thanks !!!!!!!!!!!!!! CORNE
> > >
> > >
> > > [noparse][[/noparse]Non-text portions of this message have been removed]
> > >
> > >
> > > 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/
> > >
> > >
> > >
> > >