import conf, json, time, math, statistics
from boltiot import Sms, Bolt
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]
mybolt = Bolt(conf.API_KEY, conf.DEVICE_ID)
sms = Sms(conf.SSID, conf.AUTH_TOKEN, conf.TO_NUMBER, conf.FROM_NUMBER)
history_data=[]
while True:
response = mybolt.analogRead('A0')
data = json.loads(response)
if data['success'] != 1:
print("There was an error while retriving the data.")
print("This is the error:"+data['value'])
time.sleep(10)
continue
print ("This is the value "+data['value'])
sensor_value=0
try:
sensor_value = int(data['value'])
except e:
print("There was an error while parsing the response: ",e)
continue
bound = compute_bounds(history_data,conf.FRAME_SIZE,conf.MUL_FACTOR)
if not bound: required_data_count=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)
continue
try:
if sensor_value > bound[0] :
print ("The temp level increased suddenly. Sending an SMS.")
response = sms.send_sms("Someone open fridge door")
print("This is the response ",response)
elif sensor_value < bound[1]:
print ("The temperature level decreased suddenly. Sending an SMS.")
response = sms.send_sms("Someone decrease the temperature of fridge.")
print("This is the response ",response)
history_data.append(sensor_value);
except Exception as e:
print ("Error",e)
time.sleep(10)
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