@@ -49,8 +49,19 @@ import json

 import ina260 # power sensor

 import tmp102 # temperature sensor

+# Import custom libraries

+import smsalert

+

     ### ENVIRONMENT ###

+

 _USER = os.environ['USER']

+_HOSTNAME = os.uname()[1]

+

+    ### SMS RECIPIENTS ###

+

+_SMS_CALLSIGN = '{your callsign}'

+_SMS_PASSCODE = '{your passcode}'

+_SMS_PHONE_NUMBER = '{your phone number}'

     ### SENSOR BUS ADDRESSES ###

@@ -89,11 +100,16 @@ _CHART_WIDTH = 600

 _CHART_HEIGHT = 150

 # chart average line color

 _AVERAGE_LINE_COLOR = '#006600'

+# low voltage alert threshold

+_DEFAULT_CRITICAL_LOW_VOLTAGE = 12.0

    ### GLOBAL VARIABLES ###

-# Container for sensor objects.

-dSensors = {}

+# Sensor instance objects.

+power1 = None

+battemp = None

+ambtemp = None

+sms = None

 # turns on or off extensive debugging messages

 debugMode = False

@@ -107,6 +123,8 @@ chartUpdateInterval = _CHART_UPDATE_INTERVAL

 failedUpdateCount = 0

 # sensor status

 deviceOnline = False

+# sms message sent status

+bSMSmsgSent = False

   ###  PRIVATE METHODS  ###

@@ -182,11 +200,11 @@ def getSensorData(dData):

     dData["time"] = getTimeStamp()

     try:

-        dData["current"] = dSensors['power'].getCurrent()

-        dData["voltage"] = dSensors['power'].getVoltage()

-        dData["power"] = dSensors['power'].getPower()

-        dData["battemp"] = dSensors['battemp'].getTempF()

-        dData["ambtemp"] = dSensors['ambtemp'].getTempF()

+        dData["current"] = power1.getCurrent()

+        dData["voltage"] = power1.getVoltage()

+        dData["power"] =   power1.getPower()

+        dData["battemp"] = battemp.getTempF()

+        dData["ambtemp"] = ambtemp.getTempF()

     except Exception as exError:

         print("%s sensor error: %s" % (getTimeStamp(), exError))

         return False

@@ -196,6 +214,34 @@ def getSensorData(dData):

     return True

 ## end def

+def convertData(dData):

+    """

+    Converts data items and verifies threshold crossings.

+    Parameters: dData - a dictionary object that contains the sensor data

+    Returns: True if successful, False otherwise

+    """

+    global bSMSmsgSent

+

+    if not bSMSmsgSent and dData["voltage"] <= _DEFAULT_CRITICAL_LOW_VOLTAGE:

+        # Format a text alert message.

+        message = "%s %s low voltage alert: %s volts" % \

+                  (getTimeStamp(), _HOSTNAME, dData["voltage"])

+        print(message)

+        # Send the text alert to recipient phone numbers.

+        sms.sendSMS(_SMS_PHONE_NUMBER, message)

+        bSMSmsgSent = True

+    elif bSMSmsgSent and dData["voltage"] > _DEFAULT_CRITICAL_LOW_VOLTAGE:

+        # Format a text alert message.

+        message = "%s %s voltage normal: %s volts" % \

+                  (getTimeStamp(), _HOSTNAME, dData["voltage"])

+        print(message)

+        # Send the text alert to recipient phone numbers.

+        sms.sendSMS(_SMS_PHONE_NUMBER, message)

+        bSMSmsgSent = False