Editing Pulse Necklace 15Nov2009

=Hack Notes, pulse choker, Nov 15th, 2009=

==TENS Pad Electrodes==



==Op-Amp Experiment==





==Oscillascope Code==

We got amazing code for a virtual Arduino oscilloscope from [http://accrochages.drone.ws/en/node/90 Poorman's oscilloscope] and juse changed the serial port name to correspond to either Eric's or mine cable: 

<pre>
// Pulse Choker
// Chung-Hay and Eric
// Oct 1st, 2009

// Control 5 different lines of LEDs based on EKG
// Center top line is 5V shared across all LEDs
// EKG input pin = pin 2

int OuterTwosLeft = 13; // Left, right w/r/t to viewer, not wearer
int MiddleLeft = 12;
int CenterGrd = 11;
int MiddleRight = 10;
int OuterTwosRight = 9;
int val = 0;
int minval = 10000;
int maxval = 0;
float avg = 160;   // common value, better than initing to zero
float stdev = 40;
int i;

void setup() {
  pinMode(OuterTwosLeft, OUTPUT);  
  pinMode(OuterTwosRight, OUTPUT);
  pinMode(MiddleLeft, OUTPUT);
  pinMode(MiddleRight, OUTPUT);
  pinMode(CenterGrd, OUTPUT);
  digitalWrite(OuterTwosLeft, 1);
  digitalWrite(OuterTwosRight, 1);
  digitalWrite(MiddleLeft, 1);
  digitalWrite(MiddleRight, 1);
  digitalWrite(CenterGrd, 1);  
  
  Serial.begin(57600);          //  setup serial
}


void loop() {
/*   digitalWrite(OuterTwosLeft, 1);
   delay(500);
   digitalWrite(OuterTwosRight, 1);
   delay(500);
   digitalWrite(MiddleLeft, 1); 
   delay(500);  
   digitalWrite(MiddleRight, 1);  
   delay(500);
   digitalWrite(CenterGrd, 1);
   delay(500);
   
   digitalWrite(OuterTwosLeft, 0);
   delay(500);
   digitalWrite(OuterTwosRight, 0);
   delay(500);
   digitalWrite(MiddleLeft, 0); 
   delay(500);  
   digitalWrite(MiddleRight, 0);  
   delay(500);
   digitalWrite(CenterGrd, 0);
   delay(500);
*/

  val = 0;
  for (i=0; i < 8; i++)
  {
    val += analogRead(2);    // read the input pin
  }
  val = val/8;
  if (val > maxval)
    maxval = val;
  if (val < minval)
    minval = val;
  avg = avg*99.0/100.0 + (float)val/100.0;
  stdev = sqrt ((stdev*99.0/100.0)*(stdev*99.0/100.0) + ((float)val-avg)*((float)val-avg)/100);
  Serial.print(val);
  Serial.print("  ");
  Serial.print(minval);
  Serial.print("  ");
  Serial.print(maxval);             // debug value
  Serial.print("     ");
  Serial.print(avg);
  Serial.print("  ");
  Serial.println(stdev);
  
  if (val < (avg-stdev))
  {
   // Serial.println(val);             // debug value
    digitalWrite(OuterTwosLeft, 0);   // 0 = lit  // this LED not working, unless you push down at wire connection area
    digitalWrite(OuterTwosRight, 0);
    digitalWrite(CenterGrd, 0);  // this LED not working
    digitalWrite(MiddleLeft, 0);
    digitalWrite(MiddleRight, 0);  // this LED not working  
  }
  else
  {
    digitalWrite(OuterTwosLeft, 1);  // 1 = off
    digitalWrite(OuterTwosRight, 1);
    digitalWrite(CenterGrd, 1);
    digitalWrite(MiddleLeft, 1);
    digitalWrite(MiddleRight, 1); 
  }
  //Serial.println("test");
}

</pre>