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1  Using Arduino / Audio / Re: transducers and LONG distance wires on: April 28, 2014, 04:54:53 am
afaik, vibrations in buildings in a city with not a lot of metro going underground are from 0 to 10Hz ... no more.
I'm going to ask more specific questions in another thread. I just found this too: https://www.sparkfun.com/products/11744 expensive but it makes me thinking about these frequencies range I need to test..
2  Using Arduino / Audio / Re: transducers and LONG distance wires on: April 26, 2014, 06:34:28 pm
ok got it.
if I understand correctly, each piezo have a global range and there is an optimum which is announced as the resonant peak.

I need to experiment.
Working on building vibrations...
I think very low frequencies...
From several Hz to 100 I guess.
3  Using Arduino / Audio / Re: transducers and LONG distance wires on: April 26, 2014, 06:22:13 pm
Thanks CrossRoads.
How can I estimate frequency range I can capture with this or that piezo?
I mean, is there a specific feature to check ?
4  Using Arduino / Audio / Re: transducers and LONG distance wires on: April 26, 2014, 11:23:19 am
Thanks a lot for all your feedbacks. couldn't answer before because of other projects on the go.

So now, I'm just trying to know about: piezo + arduino vs accelerometer + arduino

piezo seems easier/cheaper.
5  Using Arduino / Audio / Re: transducers and LONG distance wires on: April 13, 2014, 02:55:10 pm
Either way, digitize it and send the data out using RS485 driver.

I think I need an arduino per sensor, consider distances I'll have..
that way, I can read data with sensor/arduino, then send data with rj45 to the computer. ethernet cat7 is already set up there.
6  Using Arduino / Audio / Re: transducers and LONG distance wires on: April 07, 2014, 02:59:10 pm
What kind of transducers ? just a bare piezo element ? You can only use short wires with that. Perhaps a conditioned signal and coax.
What frequency range would you want ?

low frequencies captation. I have to experiment, but I wouldn't have things greater than 200Hz, imho.
anyway, I would use something different than arduino. I'd need a bigger sampling rate.
7  Using Arduino / Audio / transducers and LONG distance wires on: April 06, 2014, 05:00:15 pm
hi there,

I'd like to know the constraints of long distance wires when we use transducers (I mean piezo).

I'd like to capture vibrations of some parts of a (small) building and I'd need LONG wires.
How can we handle this ?


all infos could be interesting,
8  Forum 2005-2010 (read only) / Syntax & Programs / Re: monome protocol on: May 31, 2008, 04:04:55 pm
melka, do you use RGB leds ?
9  Forum 2005-2010 (read only) / Syntax & Programs / Re: Multiplex MAX72xx Code on: May 31, 2008, 12:54:05 pm
hello Steffensen & BroHogan,

I add the same result for 2 colors without ISR, for only 3x2 matrix.
Code:
int sizeX = 3;
int sizeY = 2;
 
int bitTable[8]={ 128, 64, 32, 16, 8, 4, 2, 1 };
 
int dataIn = 5;
int load = 6;
int clock = 7;
 
int maxInUse = 3;    //change this variable to set how many MAX7219's you'll use
 
int e = 0;           // just a varialble
 
                    // define max7219 registers
byte max7219_reg_noop        = 0x00;
byte max7219_reg_digit0      = 0x01;
byte max7219_reg_digit1      = 0x02;
byte max7219_reg_digit2      = 0x03;
byte max7219_reg_digit3      = 0x04;
byte max7219_reg_digit4      = 0x05;
byte max7219_reg_digit5      = 0x06;
byte max7219_reg_digit6      = 0x07;
byte max7219_reg_digit7      = 0x08;
byte max7219_reg_decodeMode  = 0x09;
byte max7219_reg_intensity   = 0x0a;
byte max7219_reg_scanLimit   = 0x0b;
byte max7219_reg_shutdown    = 0x0c;
byte max7219_reg_displayTest = 0x0f;
 
void putByte(byte data) {
  byte i = 8;
  byte mask;
  while(i > 0) {
    mask = 0x01 << (i - 1);      // get bitmask
    digitalWrite( clock, LOW);   // tick
    if (data & mask){            // choose bit
     digitalWrite(dataIn, HIGH);// send 1
    }else{
     digitalWrite(dataIn, LOW); // send 0
    }
    digitalWrite(clock, HIGH);   // tock
    --i;                         // move to lesser bit
  }
}
 
void maxSingle( byte reg, byte col) {    
//maxSingle is the "easy"  function to use for a     //single max7219
 
  digitalWrite(load, LOW);       // begin    
  putByte(reg);                  // specify register
  putByte(col);//((data & 0x01) * 256) + data >> 1); // put data  
  digitalWrite(load, LOW);       // and load da nuts
  digitalWrite(load,HIGH);
}
 
void maxAll (byte reg, byte col) {    // initialize  all  MAX7219's in the system
  int c = 0;
  digitalWrite(load, LOW);  // begin    
  for ( c =1; c<= maxInUse; c++) {
  putByte(reg);  // specify register
  putByte(col);//((data & 0x01) * 256) + data >> 1); // put data
    }
  digitalWrite(load, LOW);
  digitalWrite(load,HIGH);
}
 
void maxOne(byte maxNr, byte reg, byte col) {    
//maxOne is for adressing different MAX7219's,
//whilele having a couple of them cascaded
 
  int c = 0;
  digitalWrite(load, LOW);  // begin    
 
  for ( c = maxInUse; c > maxNr; c--) {
    putByte(0);    // means no operation
    putByte(0);    // means no operation
  }
 
  putByte(reg);  // specify register
  putByte(col);//((data & 0x01) * 256) + data >> 1); // put data
 
  for ( c =maxNr-1; c >= 1; c--) {
    putByte(0);    // means no operation
    putByte(0);    // means no operation
  }
 
  digitalWrite(load, LOW); // and load da nuts
  digitalWrite(load,HIGH);
}
 
 
void setup () {
  pinMode(dataIn, OUTPUT);
  pinMode(clock,  OUTPUT);
  pinMode(load,   OUTPUT);
 
//initiation of the max 7219
  maxAll(max7219_reg_scanLimit, 0x07);      
  maxAll(max7219_reg_decodeMode, 0x00);  // using an led matrix (not digits)
  maxAll(max7219_reg_shutdown, 0x00);    // not in shutdown mode
  maxAll(max7219_reg_displayTest, 0x00); // no display test
   for (e=1; e<=8; e++) {    // empty registers, turn all LEDs off
    maxAll(e,0);
  }
  maxAll(max7219_reg_intensity, 0x0f & 0x0f);    // the first 0x0f is the value you can set
                                               // range: 0x00 to 0x0f
 //Reset();
}  
 
void loop () {

// a little pattern very ugly
// it will be replace by a big function to update the matrix from serial messages sent from Max/msp to the board!
maxOne(1,1,128);
maxOne(1,2,64);
maxOne(2,1,32);
maxOne(2,2,190);

 
WakeUpR();
ShutdownR();
WakeUpB();
ShutdownB();
 
}
 
void ShutdownR()
{
  maxOne(1,max7219_reg_shutdown, 0x00);
}
 
void ShutdownB()
{
  maxOne(2,max7219_reg_shutdown, 0x00);
}
 
 
void WakeUpR()
{
  maxOne(1,max7219_reg_shutdown, 0x01);
}
 
void WakeUpB()
{
  maxOne(2,max7219_reg_shutdown, 0x01);
}

I'm sure ISR would be cleaner and more efficient.
But I DON'T have any flicker or very bad effects
It works fine

But the target is 8x8.
Do you think the fact the matrix is greater could create problems?


I tested this code with 3 colors... doesn't work  :o :o probably my messsssy breadboard  ;D
10  Forum 2005-2010 (read only) / Interfacing / Re: arduino simulator on: April 22, 2008, 03:29:35 pm
Quote
Check this project: http://www.fritzing.org/
it isn't a simulator
only a circuit designer ... but very very powerful, export pcb etc
VERY nice project

but not a simulator  :'(
11  Forum 2005-2010 (read only) / Development / new project/architecture questions on: January 15, 2011, 03:58:04 pm
hello,
I begin a project of sound machine.
I'd need to target the optimal micro-controller for this.
I'd probably build my PCB.

The project requires few buttons, few leds, 1 LCD and severa potentiometers. I/O aren't the main constraint ; I can use mux/demux too.

The main constraint is I want to use 2 sound creation mode:
- based on digital synthesis (algorithms making sounds rock !)
- based on audio samples stored inside a memory (?) and which could be replaced through an interface offered with the machine (interface would be a Max5 patch probably)

any ideas? thoughts?

all the best,
julien
12  Forum 2005-2010 (read only) / Interfacing / Re: ArDeci -> MAX7219 (x3) -> RGB 8x8 LED Matrix p on: May 19, 2008, 10:29:06 am
I probably disturbed people with my posts... I'm sorry  :'(
But I'm a little bit lost.

Of course I'm free, as everyone of us, to try what I want to smiley-wink
But if I share, ask, write, the reason is: I need some help.
I studied your answers. Of course, I'm not a specialist of this domain of knowledge. So, I probably asked the same kind of questions more than one times...
please, be indulgent  8-)

so, what do you think about the last solution with the wiring board?
Is it a way?
I ask that in order not to damage my board & to share my ideas too


Quote
to the embarrassing extent that I sound like I'm promoting it.
I don't understand
13  Forum 2005-2010 (read only) / Interfacing / Re: ArDeci -> MAX7219 (x3) -> RGB 8x8 LED Matrix p on: May 19, 2008, 09:18:17 am
Another idea.

as I own a Wiring Board which own itself: 48 ports DIN/DOUT.
let's read here
for one column in the sparkfun matrix PCB (the one with buttons..): 3 anodes.
for 8 columns: 3x8=24 anodes

for one line 1 pin with all the cathodes connected.
for 8 lines : 8 pins used.

8 + 24 = 32 pins needed.

Could it be possible to use only the board to drive the matrix ?
Digital Pins in "IN" mode for the DIG
Digital Pins in "OUT" mode for the SEG
 etc etc

Does it mean something?
I may have too much current to the DIN...

14  Forum 2005-2010 (read only) / Interfacing / Re: ArDeci -> MAX7219 (x3) -> RGB 8x8 LED Matrix p on: May 19, 2008, 08:08:15 am
BroHogan,

1 case (in my little head)
I use 3 max7221, one for each color.
in a column: all the same color are connected (PCB) and for one color, SEGDP to SEGA for the respective max are connected... ok.
in a line, all the ground are connected and for that line, all the max are connected on DIG0 to DIG7.
it means all the DIG are shared.
does it work ?
do I have to use cycling of the max in order to power off cyclicly one max at a time ?
(your tips about extern word works but the lib requires wiring.h... strange!)

2nd case (in my still little head  smiley-razz ) : the case steffensen and I has discussed:
I use 3 max7221, one for each color.
in a column: all the same color are connected (PCB) and for one color, SEGDP to SEGA for the respective max are connected... ok, all the same as in the first case!
in a line, all the ground are connected ; for each line: only one max is connected on DIG0 to DIG7....
does it work ? I guess it is impossible.

others cases: transistor to avoid DIG/dink sharing
no schematics in my head
but unsped may know more about that smiley
it is a thing like that: transistor are remoted by a max or the arduino to shutdown and power on the DIGs cyclically
15  Forum 2005-2010 (read only) / Interfacing / Re: ArDeci -> MAX7219 (x3) -> RGB 8x8 LED Matrix p on: May 19, 2008, 06:21:52 am
steffensen,

2 hypothesis:
- as i described: only one max is connected to the lines (I guess it is impossible to drive the color on the other lines)
- as you describe: all the max are connected to lines (DIG0 for R linked to DIG0 for G and for B .... the whole connected to line 0 (seems impossible as the guys wrote=> they use cycling or other method)

...
asap, i'll test it at home!!!


Quote
I dont see why 3 chips cant share the same GND row?
Do you mean the row would take too much incoming current?

probably too much current...

transistors could help
or
cycling


I guess... not sure!
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