fix raw measuement

read_pcf8591.py

@@ -72,19 +72,16 @@ def get_raw_voltage(ts_sensor):
         # AIN2 => Pin 2 (default)
         # AIN3 => Pin 3
 
-        # Configure PCF8591
-        if 'I2CVoltage' in ts_sensor:
-            if int(ts_sensor['I2CVoltage']) == 5:
-                factor = 1.5151515151515151
-            else:
-                factor = 1
-        else:
-            factor = 1
+        #factor = 0.09765625 # 25V/256 (=5V analog output signal)
+        factor = 16.5/256 # 16.5V/256 | 16.5V max voltage for 0xff (=3.3V analog output signal)
+        if 'I2CVoltage' in ts_sensor and ts_sensor['I2CVoltage'] is not None:
+            # convert 8 bit number to voltage
+            factor = float(ts_sensor['I2CVoltage']) / 256
 
         PCF8591.write_byte(address, 0x40+pin) # set channel to AIN0, AIN1, AIN2 or AIN3
 
         Voltage_8bit = PCF8591.read_byte(address) # = i2cget -y 1 0x48
-        voltage = Voltage_8bit*0.064453125*factor # convert 8 bit number to voltage 16.5/256 | 16.5V max voltage for 0xff (=3.3V analog output signal)
+        voltage = Voltage_8bit*factor # convert 8 bit number to voltage
 
         if isinstance(voltage, (int, float)):
             voltage=round(voltage, 4)