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 Sensor Applications
¾ÆµàÀ̳ë ÀÀ¿ë¼Ò½º
¤ýÀÛ¼ºÀÚ avrtools¢â        
¤ýÀÛ¼ºÀÏ 2012/03/29
¤ý÷ºÎ#1 tiny-oscope.zip (2KB) (Down:123)
¤ýÃßõ: 0  ¤ýÁ¶È¸: 640   
  8ä³Î 12ºñÆ® ADC MCP3208 ¿À½Ç·Î½ºÄÚÇÁ
MCP3208 ¿À½Ç·Î½ºÄÚÇÁ
¸¸ÀÏ ¾ÆµàÀ̳뿡 ³»ÀåµÈ 10ºñÆ® ADCÀÇ ÇѰ踦 ³Ñ´Â ´õ ÁÁÀº ºÐÇØ´É°ú 󸮼ӵµ°¡ ÇÊ¿äÇÏ´Ù¸é?
±×·¸½À´Ï´Ù. MCP3208À» »ç¿ëÇϸé, ÀÌ ¹®Á¦¸¦ ÇØ°áÇÒ ¼ö ÀÖ½À´Ï´Ù.

(ÁÂÃøÀº ¾Æ³¯·Î±×¸¦ ½ÅÈ£¿Í ¿¬°áÇÏ´Â ÇÉ, ¿ìÃøÀº Àû»öÀº ¾ÆµàÀÌ³ë ±âÆÇÀÇ ¿¬°á ÇÉÀÔ´Ï´Ù)
Âü°í : D13 ¿¡ ¿¬°áµÈ ¾ÆµàÀÌ³ë ±âÆÇÀÇ ³»Àå LED´Â SPI ÀÛµ¿¿¡ ¹®Á¦°¡ ¾øÀ¸¹Ç·Î ±×´ë·Î µÐ´Ù. 
   
 
MCP3208-8 ADC´Â 12 ºñÆ® adc·Î 8 chÀÇ ¾Æ³¯·Î±× ÀԷ°ú
100 kHzÀÇ »ùÇøµ ¼Óµµ·Î ÃàÂ÷ºñ±³Çü(SAR CDAC) ADC·Î SPI ÀÎÅÍÆäÀ̽º¸¦ °¡Áö°í ÀÖ½À´Ï´Ù.

VREF ÇÉ¿¡ 5.5V ¿Ü¿¡ 4.096V¸¦ Àΰ¡Çϸé ÃÖ´ëÀÔ·Â ¹üÀ§(FS)ÀÌ 4.095V·Î µÇ¹Ç·Î
12 ºñÆ® ADC¿¡¼­ ÀÐÀº 0~4095¸¦ ±×´ë·Î mV·Î »ç¿ëÀÌ °¡´ÉÇÕ´Ï´Ù.
VREF¿¡ 2.048V¸¦ ¿¬°áÇϸé 0~2.047V ¾Æ³¯·Î±× ÀÔ·ÂÀ» 0~2047 mV ÀÐÀ» ¼ö ÀÖ½À´Ï´Ù.
 
MCP3208 DIPÀ» ¸ø»ç°í, SOP16 ÆÐŰÁö¸¦ 2,000¿ø¿¡ ±¸ÀÔ, º¯È¯±âÆÇÀº ICº¸´Ù ºñ½Ñ 3,000¿ø¿¡ »ò½À´Ï´Ù. ^^;
 
 
30x14 ÇÉ »§ÆÇÀ» ¸íÇÔÅë¿¡ ³ÖÀ¸´Ï ½ï µé¾î °¡³×¿ä, ¹Ù´Ú¿¡¼­ Àý¿¬ÀÌ Àß µÇ¾î ÁÁÀ»°Í °°½À´Ï´Ù.
À̹ø¿¡ »ç¿ëÇÑ ±âÆÇÀº M328-nmini V2.0 °ú USB2serial V2.0 À¸·Î UNO¹æ½ÄÀÇ ¾ÆµàÀÌ³ë ±âÆÇ. 
 
MCP3208À» 0~5V 1CH ¿À½Ç·Î½ºÄÚÇÁ·Î ½ÃÇèÇÏ´Â ¼Ò½º
ÀÌ ¼Ò½º´Â ¾Æ·¡ÀÇ ÇÁ·Î¼¼½ÌÀ¸·Î ¿¬µ¿ÇÏ¿© ¿À½Ç·Î½ºÄÚÇÁ·Î ¸¸µé¾î º» °ÍÀÔ´Ï´Ù.
¾ÆµàÀÌ³ë ±âÆÇ¿¡ ÀÌ ½ºÄÉÄ¡¸¦ ÄÄÆÄÀÏÇÑ ´ÙÀ½, ¾÷·ÎµåÇÏ¿© Æß¿þ¾î·Î ±Á´Â´Ù.

// ÂüÁ¶ : http://arduino.cc/playground/Code/MCP3208
// hw_oscope.pde
// Arduin-O-Scope (a tiny oscilloscope project)¿ëÀ¸·Î avrtools.co.kr ¿¡¼­ °³Á¶
// 2012. 3. 29.

 
#define SEL 10   // SPI·Î »ç¿ëÇÒ ÇÉÀÇ Á¤ÀÇ, ¶óÀ̺귯¸®´Â »ç¿ëÇÏÁö ¾Ê´Â´Ù. 
#define DOUT 11  // MOSI
#define DIN  12  // MISO
#define SCK  13  // Clock
int read_value;

 
void setup(){ 
 pinMode(SEL, OUTPUT);  // SPI ¿¡ »ç¿ëÇÒ ÇÉÀÇ ÀÔÃâ·ÂÀ» ¼³Á¤ 
 pinMode(DOUT, OUTPUT);
 pinMode(DIN, INPUT);
 pinMode(SCK, OUTPUT);
 
 digitalWrite(SEL,HIGH);  // SPI¸¦ »ç¿ëÇϱâ Àü¿¡ ¸ÕÀú Á¤Áö½ÃŲ´Ù. 
 digitalWrite(DOUT,LOW);
 digitalWrite(SCK,LOW);

 Serial.begin(115200);
}

 
int read_adc(int channel){  // channel º¯¼ö·Î µé¾î¿Â °ªÀ¸·Î mcp3208ÀÇ Ã¤³ÎÀ» ¼±ÅÃÇÑ´Ù.
  int adc_value = 0;
  byte command_bits = B11000000;
// MCP3208ÀÇ ¸í·ÉºñÆ®  start, mode, chn (3), dont care (3)
 
  command_bits|=((channel-1)<<3);   // mcp3208ÀÇ Ã¤³ÎÀ» °è»ê 
  digitalWrite(SEL,LOW); //  cs ÇÉÀ» low·Î ÇÑ´Ù.

  for (int i=7; i>=3; i--){   // ÀÌÁ¦ mcp3208ÀÇ Ã¤³ÎÀ» ¼±ÅÃÇÑ´Ù
    digitalWrite(DOUT,command_bits&1<<i);
    digitalWrite(SCK,HIGH);   // cycle clock = SCK ÆÞ½º¸¦ ¸¸µç´Ù.
    digitalWrite(SCK,LOW);   
  }

 
  digitalWrite(SCK,HIGH);    //  2°³ÀÇ SCK ÆÞ½º¸¦ ¸¸µç´Ù.
  digitalWrite(SCK,LOW);
  digitalWrite(SCK,HIGH); 
  digitalWrite(SCK,LOW);

 
  for (int i=11; i>=0; i--){     // ¼±ÅÃµÈ Ã¤³ÎÀÇ ¾Æ³¯·Î±× °ªÀ» Àд´Ù.
    adc_value+=digitalRead(DIN)<<i;  
    digitalWrite(SCK,HIGH);  // cycle clock = SCK ÆÞ½º¸¦ ¸¸µç´Ù.
    digitalWrite(SCK,LOW);
  }
  digitalWrite(SEL, HIGH); // mcp3208ÀÇ cs ÇÉÀ» high·Î ÇÑ´Ù.
  return adc_value;  // ÀÐÀº °ªÀ» ÁÖÇÔ¼ö·Î °¡Áö°í ³ª°£´Ù.
}

 
// CH1 ÀÌ¿ÜÀÇ ÀÔ·ÂÀ» ÀÐÀ¸·Á¸é ¾Æ·¡ÀÇ ÇÔ¼ö¸¦ ¼öÁ¤ÇÑ´Ù.
void loop() {
 read_value = read_adc(1); 
 // Serial.write((read_value >>8) & 0xFF);  // »óÀ§ 8 ºñÆ® ¼Û½Å
 // Serial.write(read_value &0xFF);  // ÇÏÀ§ 8 ºñÆ® ¼Û½Å
 Serial.write((read_value >>4) & 0xFF); // 12 ºñÆ®¸¦ 8ºñÆ®·Î °³Á¶ÇÏ¿© ¼Û½Å
 // ¸¶Áö¸· 1ÁÙÀ», Serial.println(read_value,DEC); ·Î ¹Ù²Ù¸é ASCII °ªÀ¸·Î PC¿¡¼­ ½±°Ô º¼ ¼ö ÀÖ´Ù.


¾ÆµàÀ̳ë ÇÁ·Î¼¼½Ì ¼Ò½º
// ÂüÁ¶ »çÀÌÆ® : http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1233536778
// Arduino Forum › General › Exhibition ›
// Arduin-O-Scope (a tiny oscilloscope project)
// ÀúÀÚ : Autor : estiers
 
import processing.serial.*;
Serial inPort;                           // the port to read from
int BAUD_RATE = 115200;                  // set baud rate here, needs to be the same value as in the arduino code
int BUFFER_SIZE=200;                     // data buffer size
int GRIDS=10;                            // number of grids to draw
int inVal;                               // y-data read in from the arduino
int lastVal;                             // old value of y-data
int[] yVals = new int[BUFFER_SIZE];      // y-data buffer, scaled to the screen size
int[] xVals = new int[BUFFER_SIZE];      // x-data buffer, scaled to the screen size
int trigger;                             // trigger, when the incoming data passes this value a frame starts
int timeOut;                             // if no trigger is detected by timeOut samples, plot what is at input port
int i;                                   // counter
boolean blinker;                         // blinks a light on each frame update so you know when program is running   
boolean noTrigger;                       // true until trigger is detected
boolean noTimeOut;                       // true until timeout runs out if no trigger is found first

void setup(){
 // Àû»öÀ¸·Î µÈ ¼ýÀÚ 2 ´Â ¾ÆµàÀ̳뿡 »ç¿ëµÈ Á÷·ÄÆ÷Æ®ÀÇ ¼ø¼­ÀÌ´Ù. (³ªÅ¸³­ Æ÷Æ®¼ø¼­·Î 0, 1, 2, 3,,,,À» ¼³Á¤)
 // ¾ÆµàÀ̳ë com Æ÷Æ®¿¡ Áï com3, com4, com5°¡ ÀÖ°í, ±×Áß¿¡ com5¸¦ »ç¿ëÇÑ´Ù¸é 2·Î ¼³Á¤.                                        
  inPort = new Serial(this, Serial.list()[2], BAUD_RATE);   
  size(600, 400);                                           
  background(0);
  stroke(255);
  trigger=100;
  timeOut=2*BUFFER_SIZE;
}
 
void draw()
{
  // dump any old data sent while program wasn't running or was busy
  inPort.clear();
 
  // wait for trigger event or timeout
  noTrigger=true;
  noTimeOut=true;
  lastVal=1023;
  i=0;
  while(noTrigger & noTimeOut){
     if (inPort.available()>1){                                    // wait for a byte to appear on serial port
         inVal=(inPort.read());                                    // read the byte
         if((inVal>trigger)&(lastVal<=trigger)) noTrigger=false;   // check for trigger event
         lastVal=inVal;
         i++;
         if (i>timeOut) noTimeOut=false;                           // check for timeout event
      }
      else{
        delay(1);
      }
  }
 
  // collect a frame of data
  i=0;
  while(i<BUFFER_SIZE){                                            // read a buffer full of date                 
    if (inPort.available()>1){
          inVal=( inPort.read());
          yVals[i]=height-((height)*inVal)/254;                    // scale data to screen height
          xVals[i]=(width*i)/BUFFER_SIZE;                          // scale x-value to screen width
          i++;
      }
      else{
        delay(1);
      }
  }
 
  // draw grid lines
  background(0);
  stroke(0,64,0);
  for(i=1;i<GRIDS;i++){
    line((width*i)/GRIDS,0,(width*i)/GRIDS,height);
    line(0,(height*i)/GRIDS,width,(height*i)/GRIDS);
  }
 
  // draw trigger level
  stroke(128,0,128);
  line(0,height-(height*trigger)/254,width,height-(height*trigger)/254);
 
  // draw scope trace
  stroke(255,255,0);
  for (i=1;i<BUFFER_SIZE;i++){
    line(xVals[i-1],yVals[i-1],xVals[i],yVals[i]);
  }
 
  // draw a dot that changes state each screen update
  // if this isnt blinking, something is wrong
  stroke(255);
  if (blinker) ellipse(10,10,5,5);
  blinker=!blinker;
 
  // draw a green dot if trigger event fired frame
  if (!noTrigger){
    stroke(0,255,0);
    ellipse(20,10,5,5);
  }
  // draw a red dot if timeout event fired frame
  if (!noTimeOut){
    stroke(255,0,0);
    ellipse(30,10,5,5);
  }
 
  // this delay seems to be needed to let the system handle random events
  delay(10);
}
// move the trigger level to wherever the user clicks the mouse
void mousePressed() {
  trigger=(height-mouseY)*255/height;
}

ÀÌ ÇÁ·Î¼¼½Ì ¼Ò½º¸¦ ÇÁ·Î¼¼½Ì ÆíÁýâ¿¡ ³Ö°í ÀÛµ¿½ÃŰ¸é ¿À½Ç·Î½ºÄÚÇÁ·Î Ç¥½ÃµÈ´Ù.
 
 
MCP3208ÀÇ AIN0ÀÇ ÀԷ¿¡ M328-mini V2.0 ±âÆÇÀÇ 3.3V Àü¾ÐÀ» ÃøÁ¤ÇÑ ¿¹.
Ȳ»öÀº ÃøÁ¤Àü¾Ð, º¸¶ó»öÀº ¸¶¿ì½º·Î ´­·¯¼­ ¼³Á¤ÇÑ Æ®¸®°Å Àü¾ÐÀÌ´Ù.

ÀÌ ÇÁ·Î¼¼½ÌÀÇ ¼º´ÉÀº 1 ¹ÙÀÌÆ®¸¸ ÆÄÇü µ¥ÀÌÅÍ·Î »ç¿ëÇϹǷΠºü¸£´Ù.
¶ÇÇÑ ¸¶¿ì½º·Î Æ®¸®°Å ·¹º§À» º¯°æÇϸé, Á¿ì·Î È帣´Â ÆÄÇüÀ» Á¤Áö½ÃÄÑ º¼ ¼öµµ ÀÖ´Ù.
Æ®¸®°Å°¡ µÇ¸é ÁÂÃø »ó´ÜÀÇ ÀÛÀº Æ®¸®°Å Ç¥½Ã°¡ ±ôºýÀÌ´Â º¯È­µµ ÀÖ´Ù. 
±×¿Ü¿¡ 0.5V ´«±ÝÀÌ ÀÖ¾î, ÁøÂ¥ ¿À½Ç·Î½ºÄÚÇÁ¸¦ »ç¿ëÇϴ ȭ¸é°ú °°´Ù. ¸ÚÁö´Ù. !!!
 
-2.5V ~ +2.5VÀÇ ±³·ùÆÄÇüÀ» ÃøÁ¤ÇÒ ¶§´Â ¾Æ·¡ÀÇ È¸·Î¸¦ Ãß°¡ÇØ¾ß ÇÑ´Ù. 


OP AMP´Â LM358, LM2904, TL082, TL062 µîµî ´ÜÀü¿ø Dual OP Amp´Â ´ëºÎºÐ »ç¿ëÇÒ ¼ö ÀÖ´Ù.
OP AmpÀÇ Àü¿ø +VC 8¹ø ÇÉÀº 5V¿¡ ¿¬°áÇϰí, -VC 4¹øÇÉÀº GND·Î ¿¬°áÇÑ´Ù.
 
10K °¡º¯ÀúÇ×Àº ½ºÄÚÇÁÀÇ 0V ·¹º§ÀÇ Ç¥½ÃÀ§Ä¡¸¦ ¹Ù²Ù´Â DC OFFSET ADJ ÀÌ´Ù.
Áß°£ÀÇ ½ºÀ§Ä¡´Â AC-DC¸¦ ÀüȯÇÏ´Â ½ºÀ§Ä¡À̸ç, 470nF ijÆÐ½ÃÅͰ¡ ¾øÀ¸¸é ½ºÀ§Ä¡ ¾øÀÌ ¼îÆ®½ÃÄѵµ µÈ´Ù.

÷ºÎÆÄÀÏ¿¡´Â tiny-oscope Æú´õ ¾È¿¡ hw_oscope.pde¿Í Arduino_O_Scope.pde°¡ µé¾î ÀÖ´Ù.
processing¿¡¼­ »ç¿ëÇÏ´Â ¼Ò½ºÆú´õ sketchbook > libraries > tiny-oscope ¸¦ ³Ö´Â´Ù.
hw_oscope.pde´Â ¾ÆµàÀÌ³ë ±âÆÇ¿ë ¼Ò½ºÀÌ´Ù. ½º°ÙÄ¡¿¡¼­ ÄÄÆÄÀÏÇÏ¿© ¾ÆµàÀÌ³ë ±âÆÇÀ¸·Î Æß¿þ¾î¸¦ ¾÷·ÎµåÇÑ´Ù.
 
Arduino_O_scope.pde´Â ÇÁ·Î¼¼½Ì ¼Ò½ºÀÌ´Ù. ÄÄÆÄÀÏµÈ ÇÁ·Î¼¼½Ì : Oscope-win32.zip(297KB)
÷ºÎÆÄÀÏ Oscope > Oscope-win32 > Æú´õ ¾ÈÀÇ oscope.exe¸¦ ½ÇÇàÇÏ¸é ½ºÄÚÇÁ°¡ ÀÛµ¿µÈ´Ù.

°ø°³µÈ ÇÁ·Î¼¼½Ì ¼Ò½º´Â 0V¿Í 5V¿¡¼­ ¼±ÀÌ ¾Èº¸À̹ǷÎ, °á±¹ ÇÁ·Î¼¼½ÌÀ» ¼öÁ¤ÇÏ¿´´Ù.
  

¼öÁ¤ÈÄ 0V ¿Í 5VÀÇ ½ÅÈ£ÀÇ ¶óÀÎÀÌ º¸ÀδÙ. Æ®¸®°Å ·¹º§µµ ÃʱⰪÀ» 0.5V·Î º¯°æÇÏ¿´´Ù.
0.5V·Î Æ®¸®°ÅµÈ ¿ÀÇÂµÈ 1VpkÀÇ ÀÔ·ÂÀâÀ½ÀÇ ½ÅÈ£ÆÄÇüÀÌ È­¸é¿¡¼­ È帣Áö ¾Ê°í Á¤ÁöµÈ´Ù.
¼öÁ¤µÈ ÇÁ·Î¼¼½Ì ¼Ò½º¿Í ÄÄÆÄÀÏµÈ ½ÇÇàÆÄÀÏ :  sw_oscope.zip(596.7KB)
 
À§ÀÇ ÇÁ·Î¼¼½Ì ¼Ò½º¸¦ ¹Ù²Ù·Á¸é, ¾ÆµàÀ̳ë ÇÁ·Î¼¼½Ì »ç¿ë¹ýÀ» ÂüÁ¶.
http://www.avrtools.co.kr/technote7/board.php?board=download&command=body&no=122

ÀÌ ÇÁ·Î±×·¥Àº ¹«·á ¼ÒÇÁÆ®¿þ¾î·Î, ½Åü¿Í Àç»ê »óÀÇ ¾î¶² À§Çè°ú ¼ÕÇØ¸¦ º¸»óÇÏÁö ¾Ê½À´Ï´Ù.
ÀÌ ÇÁ·Î±×·¥Àº GNU ¹«·á ¼ÒÇÁÆ®¿þ¾î ¹èÆ÷±ÔÁ¤À» µû¸¨´Ï´Ù.
Free Software Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA
 AVRTOOLS¢â

   
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1

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