adc logic moved to separate script

software/DataAcquisitionFromDevice/datalogger.py

@@ -1,5 +1,6 @@
 from serial import Serial
 import datetime
+import mcp3425
 
 myDeviceId = '/dev/ttyUSB0'
 myBaudrate = 9600 
@@ -10,17 +11,14 @@ logFile = open('data.log', 'w')
 logFile.write("Time,Counter\n")
 
 while True:
-    #dataIn = int(ord(ser.readline().strip()))
     dataIn = ser.readline().strip()
-    msb = dataIn[0] 
-    lsb = dataIn[1]
-    voltage = ((dataIn[0] & 0xf) << 8) | lsb;
 
+    (msb, lsb) = (dataIn[0], dataIn[1])
+    voltage = mcp3425.convert(msb, lsb, mcp3425.MCP3425_RESOLUTION.R14)
     now = datetime.datetime.now()
+
     logFile.write("{0},{1}\n".format(now, dataIn))
     logFile.flush()
 
-    print(dataIn)
     print(voltage)
 
-

software/DataAcquisitionFromDevice/mcp3425.py

@@ -0,0 +1,23 @@
+# based on https://ww1.microchip.com/downloads/en/DeviceDoc/22072b.pdf
+# assumed that gain = 1
+
+from enum import Enum
+class MCP3425_RESOLUTION(Enum):
+    R12 = 1
+    R13 = 2
+    R14 = 3
+
+def convert(upperByte, lowerByte, resolution):
+    digitalToAnalog = lambda value, lsb, pga: (value * (lsb / pga))
+
+    digitalOutput = (upperByte << 8) | lowerByte;
+
+
+    if resolution == MCP3425_RESOLUTION.R12:
+        return digitalToAnalog(digitalOutput, (1 * 0.01), 1)
+        
+    if resolution == MCP3425_RESOLUTION.R13:
+        return digitalToAnalog(digitalOutput, (250 * 0.00001), 1)
+ 
+    if resolution == MCP3425_RESOLUTION.R14:
+        return digitalToAnalog(digitalOutput, (62.5 * 0.0001), 1)