Joel Eldoe
Published

Locker Alert System

A beginner level but a cool IoT project which will send a SMS on your phone whenever your precious locker is opened by someone.

IntermediateFull instructions provided2 hours563
Locker Alert System

Things used in this project

Hardware components

Bolt WiFi Module
Bolt IoT Bolt WiFi Module
×1
LDR, 5 Mohm
LDR, 5 Mohm
×1
Resistor 10k ohm
Resistor 10k ohm
×1
Buzzer
Buzzer
×1
Male/Female Jumper Wires
Male/Female Jumper Wires
×2

Software apps and online services

Bolt Cloud
Bolt IoT Bolt Cloud
VMware Workstation
Ubuntu OS
SMS Messaging API
Twilio SMS Messaging API

Story

Read more

Code

Configurations File

Python
All the important credentials have to be stored inside this file.
Save this file as conf.py
SID = 'You can find SID in your Twilio Dashboard' 
AUTH_TOKEN = 'You can find  on your Twilio Dashboard' 
FROM_NUMBER = 'This is the no. generated by Twilio. You can find this on your Twilio Dashboard'
TO_NUMBER = 'This is your number. Make sure you are adding +91(your country code) in beginning'
API_KEY = 'This is your Bolt Cloud accout API key'
DEVICE_ID = 'This is the ID of your Bolt device' 
FRAME_SIZE = 10
MUL_FACTOR = 3   # You can tune it according to your desired results.

Locker Alert System File

Python
Source Code
Save this file as locker_alert.py
import conf                     #Importing the sms configuration file
import json,time,math,statistics #Importing required python libraries
from boltiot import Bolt,Sms    #Importing from Bolt python libraries

# A function to calculate the Z-score
def calc_limit(data_history,framesize,factor):
  if(len(data_history) < framesize):
    return None
  if(len(data_history) > framesize):
    del data_history[0:len(data_history)-framesize]
  X = statistics.mean(data_history)
  Variance = 0
  for data in data_history:
    Variance = Variance + math.pow((data - X),2)
  Z = factor * math.sqrt(Variance/framesize)
  # Calculating the threshold value
  alert_value = data_history[framesize-1] + Z
  return alert_value
  
# Creating an object to access the Bolt WiFi module
device = Bolt(conf.API_KEY,conf.DEVICE_ID)
# Creating an Sms object to send SMS
sms = Sms(conf.SID,conf.AUTH_TOKEN,conf.TO_NUMBER,conf.FROM_NUMBER)

data_history = []  # A list to store the sensor data values

while(True):
  # Reading the sensor value from the cloud
  response = device.analogRead('A0') 
  # Converting the data into JSON format
  data = json.loads(response)
  try:
    sensor_value = int(data['value'])
    # Printing the sensor value
    print("The current sensor value is: ",sensor_value)
  except Exception as e:
    print("There was an error while retrieving the data!")
    # Printing the error
    print("Error: ",e)
    time.sleep(10)
    continue
  
  # Calling the function to calculate the Z-score
  limit = calc_limit(data_history,conf.FRAME_SIZE,conf.MUL_FACTOR)
  
  if(not limit):
    req_count = conf.FRAME_SIZE - len(data_history)
    print("Not enough data to compute Z-score.")
    print("Need ",req_count," more data points.")
    data_history.append(int(data['value']))
    time.sleep(10)
    continue
  
  try:
    # If an anomaly in the readings is detected
    if(int(data['value']) > limit):
      print("Sensor value has increased suddenly!")
      print("Sending an alert message...")
      device.digitalWrite(1,'HIGH')
      device.digitalWrite(2,'LOW')
      # Sending an alert message
      sms_response = sms.send_sms("ALERT! Someone has opened your locker!")
      print("This is the message report:",sms_response)
    data_history.append(int(data['value']))
  except Exception as e:
    print("An error occurred!")
    print("Error: ",e)
    
  device.digitalWrite(1,'LOW')
  device.digitalWrite(2,'LOW')
  # Taking a break of 10 seconds for the next API request
  time.sleep(10)

# Press Ctrl+C to stop the program
      
    

Credits

Joel Eldoe

Joel Eldoe

1 project • 0 followers
Engineering Student at MIT Academy of Engineering
Thanks to Bolt IoT and Pranav Pai Vernekar.

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