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Using DTMF to drive solenoids

E

Eibert Draisma

Jan 1, 1970
0
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.
 
J

John Fields

Jan 1, 1970
0
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?

---
Maybe.

Do you plan to drive the solenoids mutually exclusively, (only one on
at a time) or will you be driving more than one simultaneously?

Do you want the solenoid(s) to latch on and off, or will they only be
on when their DTMF tone pairs are hot?
 
T

Tom Biasi

Jan 1, 1970
0
Eibert Draisma said:
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.
Hi,
You certainly need to consider the questions of John Fields but may I ask,
why do you want to take the DTMF approach?
You may find the decoding time is too slow for your application. There are
many digital schemes that can do what you want.
Tom
 
E

Eibert Draisma

Jan 1, 1970
0
Dear John,

My idea was to drive one solenoid at a time; I can imagine driving more
solenoids (each related to a specific DTMF tone) simultaneously would result
in problems concerning the decoding?
The solenoids should only be "on" when their DTMF tone pairs are hot; I
simply would record a "DTMF-tones song" and store it on a MP3 player.

What do you think; would this work?

Eibert Draisma.
 
O

Owamanga

Jan 1, 1970
0
I am looking for hardware to control 16 solenoids using DTMF tones.
In fact I am building an instrument consisting of 16 automated
castagnettes.

Castagnettes being two small wooden paddle things tied together with a
piece of string? - Like the flamenco dancers use?

You want to automate 16 small wooden percussion instruments?

....hmm...this isn't going to sound good, is it?
 
J

John Fields

Jan 1, 1970
0
Dear John,

My idea was to drive one solenoid at a time; I can imagine driving more
solenoids (each related to a specific DTMF tone) simultaneously would result
in problems concerning the decoding?
The solenoids should only be "on" when their DTMF tone pairs are hot; I
simply would record a "DTMF-tones song" and store it on a MP3 player.

What do you think; would this work?

---
Yeah, it'll work fine if, as Tom Biasi noted, you can take the delays.
Something like 40 or 50ms from the time DTMF ocurs on the decoder
input until the decoded outputs go true, and about the same, I think,
for the release. In any case it's on the data sheets.

Just as an aside, why do you want to use DTMF?
 
E

Eibert Draisma

Jan 1, 1970
0
I don't care about the delays as this concerns a stand alone instrument;
performing only now and than when it feels like performing...

The only reason I wanted to use DTMF is I think the electronics can be
cheap. (I don't need all kind of advanced midi possibilities)
Besides this I would like to keep the circuitry as simple and compact as
possible.

Do you think this is the right approach?

Eibert Draisma.
 
P

Peter van der Vos

Jan 1, 1970
0
Owamanga said:
Castagnettes being two small wooden paddle things tied
together with a piece of string? - Like the flamenco
dancers use?

You want to automate 16 small wooden percussion
instruments?

...hmm...this isn't going to sound good, is it?

No, this is not going to work. The delay's for DTMF are to
big to do ritmitical things like castagnettes. The delay's
should not be bigger than 10 mSec.

What you should do is tell us what you want to do, then
people can give sugestions instead of you giving solution
while we don't understand the real problem.


Good luck,

Peter
NB. (and you shouldn't crosspost to 6 groups
comp.robotics.misc should be enough).
 
J

John Fields

Jan 1, 1970
0
I don't care about the delays as this concerns a stand alone instrument;
performing only now and than when it feels like performing...

The only reason I wanted to use DTMF is I think the electronics can be
cheap. (I don't need all kind of advanced midi possibilities)
Besides this I would like to keep the circuitry as simple and compact as
possible.

Do you think this is the right approach?

---
It sounds fine to me, and here's how I'd do it:

+V
|
+----------+
|K |
[1N4001] [SOLENOID 16]
| |
+----------+
Vcc |
| +--------+ C
+---------+ +---|LE Q15|--[R16]--B Q16
DTMF>---|Vin Q4|---------|A3 Q14| . E
| Q3|---------|A2 Q13| . |
| Q2|---------|A1 Q12| . GND
| Q1|---------|A0 Q11| .
| | |\ |_ Q10| .
| StD|--| >O--O|E Q09| . +V
+---------+ |/ | Q08| . |
MT8870 | Q07| . +----------+
| Q06| . |K |
| Q05| . [1N4001] [SOLENOID1]
| Q04| . | |
| Q03| . +----------+
| Q02| . |
| Q01| . C
| Q0|--[R1]---B Q1
+--------+ E
HC4514 |
GND

If you know what solenoids you want to use (or their actuation
current) I can recomment suitable MOSFET or bipolar driver transistors
and base resistors. Also, if you don't need more than the one
inverter on the ENABLE input of the 4514, it would be easy to
sustitute a transistor and save a chip.
 
S

steamer

Jan 1, 1970
0
--Sill me; what is DTMF?
--I'm using solenoids as well, via Stamp, but to control a (fairly
primitive) tap-dancing robot.
 
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