How to use DTMF tones to drive solenoids?

E

Eibert Draisma

Guest
Dear All,

I am new to DTMF as well as to this group so forgive me in case of "stupid"
questions...

I am looking for hardware to control 16 solenoids using DTMF tones.
In fact I am building an instrument consisting of 16 automated castagnettes.

My goal is to find a solution as simple as possible to drive the
castagnettes.

My basic idea is:
1) Use a MP3 player to store a "song" consisting out of differtent DTMF
tones
2) Use a simple DTMF receiver connected to the MP3 player to detect the DTMF
tones (e.g. MT8870D / MT8870D-1 Integrated DTMF receiver)
3) Use simple electronics connected to the DTMF receiver to drive 16
solenoids.
(Solenoids: 12VAC or 12VDC)


Does anyone of you know a simple approach to do this?
I know just enough about electronics to build a simple schematic.

I really hope anyone of you can give me some help!

Best regards,
Eibert Draisma.
 
Eibert Draisma wrote:
I am looking for hardware to control 16 solenoids using DTMF tones.
In fact I am building an instrument consisting of 16 automated castagnettes.

My goal is to find a solution as simple as possible to drive the
castagnettes.

My basic idea is:
1) Use a MP3 player to store a "song" consisting out of differtent DTMF
tones
2) Use a simple DTMF receiver connected to the MP3 player to detect the DTMF
tones (e.g. MT8870D / MT8870D-1 Integrated DTMF receiver)
3) Use simple electronics connected to the DTMF receiver to drive 16
solenoids.
(Solenoids: 12VAC or 12VDC)


Does anyone of you know a simple approach to do this?
I know just enough about electronics to build a simple schematic.
Click to expand...
First, do you really have to use that scheme (I mean use a MP3 player
and all that ...) ? Anyway, I'll first explain how to control solenoid
from a digital signal then maybe a simpler scheme than DTMF tone for
song storage.

So, you have a digital signal, either 3.3v or 5v representing a logic 1
(that is solenoid active). How to convert that will depend on your
solenoid spec. You said AC or DC, the circuit might change depending on
what it is. Then you also need the current flowing thru that solenoid.

Since you say, it's for music, it may be best to avoir mechanical
relays, they produce a "clicking" sound. So the best solution for you
might be a simple NMOS if it's DC, or a PhotoMOS (SolidState relay) if
it's AC or you want optical isolation. That depends on the cur.rent
requirements. In the simplest case :


12V -----
|
C
C
C
C
|
_|
In>-|_ NMOS
|
|
###
GND

Since the solenoid will produce high reverse peak voltage when turned
on/off, you should add a diode to flow the current back to the supply
(I'm too lazy to add it on the ascii schematics, just a diode across the
NMOS Drain/Source, cathode on the solenoid side). Actually some NMOS
might have that diode integrated, don't know but might be good enough.


Now, instead of you whole MP3 player stuff, using a simple uC with
integrated EEPROM, you might store a big quantity of "music", with a
decreased (IMHO) complexity. A low end pic or atmel AVR with integrated
oscillator and enough IO. If you take one with UART, you could connect
it to your PC to directly upload the songs to the internal eeprom or flash.



Sylvain
 
On Mon, 25 Jul 2005 14:46:14 +0200, Sylvain Munaut <com.246tNt@tnt>
wrote:
Since the solenoid will produce high reverse peak voltage when turned
on/off, you should add a diode to flow the current back to the supply
(I'm too lazy to add it on the ascii schematics, just a diode across the
NMOS Drain/Source, cathode on the solenoid side). Actually some NMOS
might have that diode integrated, don't know but might be good enough.
Click to expand...
Be careful. Most NMOS do have a diode integrated (cathode connected to
drain, anode to source), but that diode cannot provide an alternate
path for the solenoid current when the NMOS is turned off. Therefore,
that diode does not avoid or even reduce voltage buildup across drain
and source, when the NMOS is opened. The diode to protect against this
must be in parallel with the load (cathode to positive node of the
load, anode to negative node).
 
On Mon, 25 Jul 2005 14:16:34 +0200, "Eibert Draisma"
<Kulos@worldmail.nlX> wrote:

I am looking for hardware to control 16 solenoids using DTMF tones.
In fact I am building an instrument consisting of 16 automated castagnettes.
Click to expand...
I suggest that you not use DTMF tones. The delay time inherent in the
decoding process will be noticeable if the timing needs to be
synchronized with other instruments in a performance, or if it
controlled manually.


-Robert Scott
Ypsilanti, Michigan
 
Eibert Draisma wrote:

Dear All,

I am new to DTMF as well as to this group so forgive me in case of "stupid"
questions...

I am looking for hardware to control 16 solenoids using DTMF tones.
Click to expand...
Why do you want to use DTMF tones ?

It seems to me like you could use MIDI to do what you want and it would be
vastly more versatile.

Graham
 
In article <554b6$42e4d767$3ea31e09$987@news.chello.nl>,
Kulos@worldmail.nlX says...
I am looking for hardware to control 16 solenoids using DTMF tones.
In fact I am building an instrument consisting of 16 automated castagnettes.

My goal is to find a solution as simple as possible to drive the
castagnettes.
Click to expand...
Offhand, I'd have thought MIDI would be the interface of choice,
being a standard in the music world and all...
 
On Mon, 25 Jul 2005 14:16:34 +0200, Eibert Draisma wrote:

I am new to DTMF as well as to this group so forgive me in case of "stupid"
questions...

I am looking for hardware to control 16 solenoids using DTMF tones.
In fact I am building an instrument consisting of 16 automated castagnettes.
Click to expand...
What's a castagnette?

Thanks,
Rich
 
On Tue, 26 Jul 2005 15:40:28 GMT, in sci.electronics.design Rich Grise
<richgrise@example.net> wrote:

On Mon, 25 Jul 2005 14:16:34 +0200, Eibert Draisma wrote:

I am new to DTMF as well as to this group so forgive me in case of "stupid"
questions...

I am looking for hardware to control 16 solenoids using DTMF tones.
In fact I am building an instrument consisting of 16 automated castagnettes.


What's a castagnette?

Thanks,
Rich
a noisy spanish thing (apart from the goddamn mopeds)
Click to expand...


martin
 
On Tue, 26 Jul 2005 18:03:19 +0200, the renowned martin griffith
<martingriffith@XXyahoo.co.uk> wrote:

On Tue, 26 Jul 2005 15:40:28 GMT, in sci.electronics.design Rich Grise
richgrise@example.net> wrote:

On Mon, 25 Jul 2005 14:16:34 +0200, Eibert Draisma wrote:

I am new to DTMF as well as to this group so forgive me in case of "stupid"
questions...

I am looking for hardware to control 16 solenoids using DTMF tones.
In fact I am building an instrument consisting of 16 automated castagnettes.


What's a castagnette?

Thanks,
Rich
a noisy spanish thing (apart from the goddamn mopeds)


martin
Click to expand...
Dutch, French (and??) spelling for castanets. The word is related to
"chestnut". I've got a wind chime-y kind of thing made from dried
chestnut shells. Wish I could remember where I got it. Mexico, maybe.



Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
 
On Tue, 26 Jul 2005 12:33:58 -0400, Spehro Pefhany wrote:

On Tue, 26 Jul 2005 18:03:19 +0200, the renowned martin griffith
martingriffith@XXyahoo.co.uk> wrote:

On Tue, 26 Jul 2005 15:40:28 GMT, in sci.electronics.design Rich Grise
richgrise@example.net> wrote:

On Mon, 25 Jul 2005 14:16:34 +0200, Eibert Draisma wrote:

I am new to DTMF as well as to this group so forgive me in case of "stupid"
questions...

I am looking for hardware to control 16 solenoids using DTMF tones.
In fact I am building an instrument consisting of 16 automated castagnettes.


What's a castagnette?

Thanks,
Rich
a noisy spanish thing (apart from the goddamn mopeds)


martin

Dutch, French (and??) spelling for castanets. The word is related to
"chestnut". I've got a wind chime-y kind of thing made from dried
chestnut shells. Wish I could remember where I got it. Mexico, maybe.
Click to expand...
You mean those things that go clickety-clack when they're doing
the flamingo [sic] dance? And he wants SIXTEEN of them?

Eek!
Rich
 
On Wed, 27 Jul 2005 00:55:40 +0000, Rich Grise wrote:

You mean those things that go clickety-clack when they're doing
the flamingo [sic] dance? And he wants SIXTEEN of them?
Click to expand...
I think it's "flamenco" akshurely.

<FX: Monty Python>

"Some tiny, emaciated Dago in tights, and a bint with a big arse and her
hair Brylcreemed (sp?) down"

--
"Electricity is of two kinds, positive and negative. The difference
is, I presume, that one comes a little more expensive, but is more
durable; the other is a cheaper thing, but the moths get into it."
(Stephen Leacock)
 
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