Refrigerator Monitor

   """Code for Capstone project"""
   
import email_conf, sms_conf, json, time, math, statistics
from boltiot import Email, Bolt, Sms

#Function to set upper and lower bound by Z-score analysis
def compute_bounds(history_data,frame_size,factor):
    if len(history_data)<frame_size :
        return None
    if len(history_data)>frame_size :
        del history_data[0:len(history_data)-frame_size]
    Mn=statistics.mean(history_data)
    Variance=0
    for data in history_data :
        Variance += math.pow((data-Mn),2)
    Zn = factor * math.sqrt(Variance / frame_size)
    High_bound = history_data[frame_size-1]+Zn
    Low_Bound = history_data[frame_size-1]-Zn
    return [High_bound,Low_Bound]
    
critical_limit = 8 #the critical_value of temperature
maximum_limit = 10 #the maximum_value of temperature

# Configuring bolt device
mybolt = Bolt(email_conf.API_KEY, email_conf.DEVICE_ID)
# Configuring email alert requirement
mailer = Email(email_conf.MAILGUN_API_KEY, email_conf.SANDBOXURL, email_conf.SENDER_EMAIL, email_conf.RECIPIENT_EMAIL)
# Configuring sms alert requirement
sms = Sms(sms_conf.SSID, sms_conf.AUTH_TOKEN, sms_conf.TO_NUMBER, sms_conf.FROM_NUMBER)
# setting up empty list to save the temperature sensor readings
history_data=[]
  
  
while True:
    
    # saves bolt module response in a variable
    response = mybolt.analogRead('A0')
    
    # saves the response data in a variable
    data = json.loads(response)
    
    if data['success'] != '1':
        
        # display an error when the response in data equals to '0'
        print("There was an error while retriving the data.")
        print("This is the error:"+data['value'])
        time.sleep(10)
        continue
    
    #display the value of data while the error occured  
    print ("The is the value"+data['value'])
    
    # initialization of sensor_value to 0
    sensor_value=0
    try:
       # saves current sensor value in variable
        sensor_value = int(data['value'])
    except e:
        print("There was an error while parsing the response: ",e)
        continue
      
     # saving the upper and lower bounds by Z-score analysis in a variable named bound  
    bound = compute_bounds(history_data,email_conf.FRAME_SIZE,email_conf.MUL_FACTOR)
    
    # checks if bound is empty or not
    # if it is empty, then it will save the current sensor value in the history_data list otherwise, will directly go to try.
    if not bound:
        required_data_count=email_conf.FRAME_SIZE-len(history_data)
        print("Not enough data to compute Z-score. Need ",required_data_count," more data points")
        history_data.append(int(data['value']))
        time.sleep(10)
        
    try:
      #convert the temperature to display in degree celsus
        temp = sensor_value/10.24
        
        # condition for when the temperature crosses the maximum_limit
        if temp > maximum_limit:
            print ("The Temperature value increased suddenly. Sending an sms.")
            # display the temeprature value in degree celsus
            print ("The Current temperature is: "+str(temp)+" C")
            response = sms.send_sms("Alert ! Someone has opened the fridge door")
            print("This is the response ",response)
            
        # condition for the temperature value is between  the critical_limit and the maximum_limit     
        elif temp > critical_limit or temp < maximum_limit:
            print("Urgent! Temperature condition can destroy the tablets. Sending an email.")
            #display the temperature value in degree celsus
            print (" The Current temperature is:" +str(temp)+ "C")
            response = mailer.send_email("Alert !","The level temperature can destroy the tablets.")
            print("This is the response",response)
        history_data.append(sensor_value)
    
    # in case of any error    
    except Exception as e:
           print ("Error",e)
    time.sleep(10)