Diff: windSensor.cpp

Revision:

1:d07f80ef7abc

Parent:

0:397523d4133e

--- a/windSensor.cpp	Thu Dec 01 00:42:08 2016 +0000
+++ b/windSensor.cpp	Sun Dec 11 21:12:18 2016 +0000
@@ -1,17 +1,31 @@
 #include "windSensor.h"
 
-windSensor :: windSensor(PinName p, NeoStrip *_strip)
-    : sensor(p), strip(_strip)
+windSensor :: windSensor(PinName p, NeoStrip *_strip, PinName p2, PinName p3)
+    : sensor(p), strip(_strip), barometer(p2, p3, (0x60<<1))
 {
-    thresh = sensor.read()*1.4;
+    //thresh = sensor.read()*1.4;
+    thresh = 0.63;
     isBreathing = false;
     breathCount = 0;
     strip->setBrightness(0.1);
+    strip->clear();
+    spike = false;
+    barometer.config();
+    wait(0.1);
+    int i; 
+    float base = 0.0;
+    for(i = 0; i<10; i++) {
+        float tempPress = barometer.getPressure();
+        base = base + tempPress;
+        //printf("%12.5f\n",val);
+    }
+    base = base/10.0; //get first pressure baseline reading
+    pressure_threshold = 0.96*base;
 }
 
 void windSensor::startReading()
 {
-    breathReader.attach(this, &windSensor::sample, .002f);
+    breathReader.attach(this, &windSensor::sample, .02f);
     //volatile float a = sensor;
     //printf("\nwindsensor reads: %f", a);
     //printf("\nthresh is: %f", thresh);
@@ -44,11 +58,11 @@
 {
     __disable_irq();
     float readVal = sensor.read();                          // sample
-
-
+    //printf("%f\n",readVal);
     //check to see if victim is breathing at all above natural variation in sensor noise
     if(readVal >= thresh) {
         breathCount++;                         //increment global counter
+        printf("Found breath");
     }
     if(breathCount >= 3) { //should set this higher if want more certainty in victim breathing
         isBreathing = true;
@@ -66,11 +80,13 @@
 
 float windSensor::give_breath(void)
 {
+    spike = false;
     strip->initialize();
     c.clear();
     t.reset();
     q.reset();
     //float a = 0.0;
+    
     float d = 0.0; //return time for fractional breathes
     float e = 0.0;
     int i;
@@ -100,7 +116,7 @@
                     e = e + c[i];
                 }
                 e = e/10.0; //provides slope of 10 most recent samples
-                float oldTimerVal = 0;
+                float oldTimerVal = 0, pressure;
                 float timerVal = q.read();
                 while( (e > thresh) && (timerVal < 1.0)) {
 
@@ -115,6 +131,14 @@
                         strip->progress(timerVal);
                         oldTimerVal = timerVal;
                     }
+                    
+                    pressure = barometer.getPressure();
+                    //printf("Pressure: %f\n", pressure);
+                    if(pressure < pressure_threshold){
+                        spike = true;
+                        //printf("SPIKE");
+                    }
+                    
                 }
                 d = q.read();
                 if(q.read() > 1.0) { //breathe was greater than thresh and lasted more than 1 sec
@@ -131,7 +155,12 @@
             return 0.0; //no breath in 3 seconds
         }
     }
+}
 
+//call this member function to see if there is a pressure spike
+bool windSensor::pressureSpikeDetected()
+{
+    return spike; //return true if spike occured during give_breath. 
 }