python serial read.

code/python_serial/serial.pi

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+#!/usr/bin/python
+
+'''
+Original data collection script by Ben Kenney - July 2012
+This program reads data coming from the serial port and saves that data to a text file. It expects data in the following format with a comma (,) as a separator:
+"value1,value2"
+It assumes that the Arduino shows up in /dev/ttyACM0 on the Raspberry Pi which should happen if you're using Debian.
+'''
+
+import serial
+from time import strftime
+from datetime import datetime, time
+
+ser = serial.Serial('/dev/ttyACM0',9600)
+
+startTime = datetime.now()
+try:
+    while 1:
+        line=ser.readline().rstrip()
+#        temp,outsidetemp=line.split(",")
+#	we have more data. 
+#	I don't know what they are yet...
+	read1,read2,read3=line.split(",");
+        now = datetime.now()
+        elapsedTime = now-startTime
+        elapsedSeconds = (elapsedTime.microseconds+(elapsedTime.days*24*3600+elapsedTime.seconds)*10**6)/10**6
+#this is the original
+#
+ #       f=open('/home/pi/sensors/sensordata/temperaturedata.csv','a')
+#
+        f=open('./temperaturedata.csv','a')
+        print >>f,("%s,%s,%s,%s,%s"%(now.strftime("%Y-%m-%d %H:%M:%S"),elapsedSeconds,read1,read2,read3))
+	f.close()
+except KeyboardInterrupt:
+	print "\ndone"

code/python_serial/temperaturedata.csv

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+2019-01-05 19:59:18,27,112105,0.37,194.46
+2019-01-05 19:59:48,58,104586,0.35,181.49