added emissivity

README.md

@@ -8,9 +8,6 @@
 | FTDI(FT2232H)  | 1.1.0    | 1.1.0         | 1.1.0                | 1.1.0                      |
 | I2C-bus(40pin) | N/A      | N/A           | 1.1.0                | 1.1.0                      |
 
-
-# mlx90632-driver 
-
 ## Intro
 
 This python driver for MLX90632 aims to facilitate the interfacing on a PC.

mlx90632/mlx90632.py

@@ -22,6 +22,7 @@ def __init__(self, hw, i2c_addr=0x3A):
         self.reload_calibration_data_on_brownout = True
         self.wait_new_data_until_end_of_full_cycle = False
         self.hw = None
+        self.emissivity = 1.0
         if hw is None or hw == 'auto':
             hw = "mlx://evb:90632/1"
         if isinstance(hw, str):
@@ -51,15 +52,29 @@ def __init__(self, hw, i2c_addr=0x3A):
         atexit.register(self.disconnect)
 
 
+    @property
+    def emissivity(self):
+        return self._emissivity
+
+
+    @emissivity.setter
+    def emissivity(self, emissivity):
+        if emissivity < 0:
+            raise ValueError("emssivity range is 0..1; {} given".format (emissivity))
+        if emissivity > 1:
+            raise ValueError("emssivity range is 0..1; {} given".format (emissivity))
+        self._emissivity = emissivity
+
+
     def init(self):
         self.read_status()
         self.clear_new_data()
         self.read_status()
         self.read_control()
         self.read_calibration_data()
 
+
     def read_calibration_data(self):
-
         trim_version = 0
         dsp_version = 0
         cal_Ea = 74.0
@@ -138,7 +153,6 @@ def read_calibration_data(self):
           EE_cal_VddMonOffset -= 2**16
         cal_VddMonOffset = EE_cal_VddMonOffset
 
-
         self.calib_data = {
                 'cal_Ea'  : cal_Ea, 
                 'cal_Eb'  : cal_Eb, 
@@ -166,26 +180,29 @@ def read_calibration_data(self):
         self.set_brownout(use_cache=False)
         return self.calib_data
 
+
     def set_vdd(self, vdd):
         """Set Vdd of the sensor"""
         # if supported...
         if callable(getattr(self.hw, 'set_vdd', None)):
             self.hw.set_vdd(vdd)
 
+
     def get_refresh_rate(self):
         return self.frame_rate
 
+
     def clear_error(self):
         if callable(getattr(self.hw, 'clear_error', None)):
             self.hw.clear_error(self.i2c_addr)
 
+
     def write_ee_refresh_rate(self, refresh_rate, unit='Hz'):
         """
         Write the refresh rate to EEPROM
         :param frame_rate: the new frame rate for the sensor
         :param unit: 'Hz' or 'code'.
         """
-
         refresh_rate_code = refresh_rate
         if unit == 'Hz':
             refresh_rate_code = 2
@@ -426,7 +443,7 @@ def do_compensation(self, raw_data):
 
         # iterate 3 times:
         for i in range (3):
-          Za = Ha * Fa * (1 + Ga * (TO_computed - 25) + Fb * (TA_computed - 25))
+          Za = self.emissivity * Ha * Fa * (1 + Ga * (TO_computed - 25) + Fb * (TA_computed - 25))
           TO_computed = (Yb/Za + (TA_computed+273.15)**4)**0.25 - 273.15 - Hb
 
         return (TA_computed, TO_computed)

setup.py

@@ -2,7 +2,7 @@
 import sys
 import platform
 
-version='1.1.1'
+version='1.2.0'
 
 requires = ['bincopy>=17.8.0',
             'pyftdi>=0.51.2',