new app called stethoscope

apps/stetho/stetho-icon.js

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+require("heatshrink").decompress(atob("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"))

apps/stetho/stetho.js

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+Bangle.setLCDPower(1);
+Bangle.setLCDTimeout(0);
+Bangle.ioWr(0x80,0)
+x=0;
+var min=0,max=0;
+var wasHigh = 0, wasLow = 0;
+var lastHigh = getTime();
+var hrmList = [];
+var hrm;
+
+function readHRM() {
+  var a = analogRead(D29);
+  var h = getTime();
+  min=Math.min(min*0.97+a*0.03,a);
+  max=Math.max(max*0.97+a*0.03,a);
+  y = E.clip(170 - (a*960*4),100,230);
+  if (x==0) {
+    g.clearRect(0,100,239,239);
+    g.moveTo(-100,0);
+  }
+  /*g.setColor(0,1,0);
+  var z = 170 - (min*960*4); g.fillRect(x,z,x,z);
+  var z = 170 - (max*960*4); g.fillRect(x,z,x,z);*/
+  g.setColor(1,1,1);
+  g.lineTo(x,y);
+  if ((max-min)>0.005) {
+    if (4*a > (min+3*max)) { // high
+      g.setColor(1,0,0);
+      g.fillRect(x,230,x,239);
+      g.setColor(1,1,1);
+      if (!wasHigh && wasLow) {
+        var currentHrm = 60/(h-lastHigh);
+        lastHigh = h;
+        if (currentHrm<250) {
+          while (hrmList.length>12) hrmList.shift();
+          hrmList.push(currentHrm);
+          // median filter
+          var t = hrmList.slice(); // copy
+          t.sort();
+          // average the middle 3
+          var mid = t.length>>1;
+          if (mid+2<t.length)
+            hrm = (t[mid]+t[mid+1]+t[mid+2])/3;
+          else if (mid<t.length)
+            hrm = t[mid];
+          else
+            hrm = 0;
+          g.setFontVector(40);
+          g.setFontAlign(0,0);
+          g.clearRect(0,0,239,100);
+          var str = hrm ? Math.round(hrm) : "?";
+          var px = 120;
+          g.drawString(str,px,40);
+          px += g.stringWidth(str)/2;
+          g.setFont("6x8");
+          g.drawString("BPM",px+20,60);
+        }
+      }
+      wasLow = 0;
+      wasHigh = 1;
+    } else if (4*a < (max+3*min)) { // low
+      wasLow = 1;
+    } else { // middle
+      g.setColor(0.5,0,0);
+      g.fillRect(x,230,x,239);
+      g.setColor(1,1,1);
+      wasHigh = 0;
+    }
+  }
+  x++;
+  if (x>239)x=0;
+}
+
+setInterval(readHRM,50);

apps/stetho/stetho.json

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+{
+  "name":"Stethoscope","type":"app",
+  "icon":"*stetho",
+  "src":"-stetho"
+}