Decode temperature

Contributors.md

@@ -0,0 +1,3 @@
+# Contributors
+- [Nathan Faber](https://github.com/nathanfaber)
+- [Eric Thomas](https://github.com/b0naf1de)

meaterTemperature.py

@@ -0,0 +1,45 @@
+
+__all__ = ['Temperature']
+
+class Temperature:
+   def __init__(self, tempBytes):
+      self._tip = Temperature.bytesToInt(tempBytes[0], tempBytes[1])
+      self._ambient = Temperature.convertAmbient(tempBytes)
+
+   @staticmethod
+   def bytesToInt(byte0, byte1):
+      return byte1*256+byte0
+
+   @staticmethod
+   def convertAmbient(array): 
+      tip = Temperature.bytesToInt(array[0], array[1])
+      ra  = Temperature.bytesToInt(array[2], array[3])
+      oa  = Temperature.bytesToInt(array[4], array[5])
+      return int(tip+(max(0,((((ra-min(48,oa))*16)*589))/1487)))
+
+   @staticmethod
+   def toCelsius(value):
+      return (float(value)+8.0)/16.0
+
+   @staticmethod
+   def toFahrenheit(value):
+      return ((Temperature.toCelsius(value)*9)/5)+32.0
+
+   def getTip(self):
+      return self._tip
+
+   def getTipF(self):
+      return Temperature.toFahrenheit(self._tip)
+
+   def getTipC(self):
+      return Temperature.toCelsius(self._tip)
+
+   def getAmbientF(self):
+      return Temperature.toFahrenheit(self._ambient)
+
+   def getAmbient(self):
+      return self._ambient
+
+   def getAmbientC(self):
+      return Temperature.toCelsius(self._ambient)
+

readMeater.py

@@ -22,6 +22,8 @@
 import time
 import pickle
 import binascii
+
+from meaterTemperature import Temperature
 
 print "Connecting..."
 addr = sys.argv[1]
@@ -40,18 +42,18 @@ def enumerateDev(dev):
             print
 
 
-calcF = lambda Accum, Count, Slope, Intercept: (Accum+Count*255)*Slope + Intercept
-
 service=dev.services[2]
 char=service.getCharacteristics()[1]
 fp=open(addr + ".pickle", "ab")
 while True:
     r1 = bytearray(char.read())
-    tipF = calcF(r1[0], r1[1], 0.113, 31.7)
-    ambF = calcF(r1[2], r1[3], 1.04, 139)
-    print "%d,%d,%d,%d,%d,%d,%d,%d" % (r1[0], r1[1], r1[2], r1[3], r1[4], r1[5], r1[6], r1[7])
-    print "tip: %d %d (%fF) tail: %d %d (%fF)" % (r1[0], r1[1], tipF, r1[2], r1[3], ambF )
+    print ("".join("0x%02x, " % i for i in r1))
+
+    temp = Temperature(r1)
+    print "    tip: %s %d %fF (%fC)" % (hex(temp.getTip()), temp.getTip(), temp.getTipF(), temp.getTipC())
+    print "ambient: %s %d %fF (%fC)" % (hex(temp.getAmbient()), temp.getAmbient(), temp.getAmbientF(), temp.getAmbientC())
+    print ""
+
     pickle.dump((time.time(), r1), fp)
     fp.flush()
     time.sleep(1)
-