Temperature Sensor

micro_ondes/esp_wifi/sensors/temperature_sensor.py

@@ -0,0 +1,62 @@
+import ustruct
+
+class SensorBase:
+
+	def read16(self, register):
+		data = self.i2c.readfrom_mem(self.address, register, 2)
+		return ustruct.unpack('<H', data)[0]
+
+	def read_temp(self, register):
+		temp = self.read16(register);
+		# apply measurement resolution (0.02 degrees per LSB)
+		temp *= .02;
+		# Kelvin to Celcius
+		temp -= 273.15;
+		return temp;
+
+	def read_ambient_temp(self):
+		return self.read_temp(self._REGISTER_TA)
+
+	def read_object_temp(self):
+		return self.read_temp(self._REGISTER_TOBJ1)
+
+	def read_object2_temp(self):
+		if self.dual_zone:
+			return self.read_temp(self._REGISTER_TOBJ2)
+		else:
+			raise RuntimeError("Device only has one thermopile")
+
+	@property
+	def ambient_temp(self):
+		return self.read_ambient_temp()
+
+	@property
+	def object_temp(self):
+		return self.read_object_temp()
+
+	@property
+	def object2_temp(self):
+		return self.read_object2_temp()
+
+class MLX90614(SensorBase):
+
+	_REGISTER_TA = 0x06
+	_REGISTER_TOBJ1 = 0x07
+	_REGISTER_TOBJ2 = 0x08
+
+	def __init__(self, i2c, address=0x5a):
+		self.i2c = i2c
+		self.address = address
+		_config1 = i2c.readfrom_mem(address, 0x25, 2)
+		_dz = ustruct.unpack('<H', _config1)[0] & (1<<6)
+		self.dual_zone = True if _dz else False
+
+class MLX90615(SensorBase):
+
+	_REGISTER_TA = 0x26
+	_REGISTER_TOBJ1 = 0x27
+
+	def __init__(self, i2c, address=0x5b):
+		self.i2c = i2c
+		self.address = address
+		self.dual_zone = False