Published July 2, 2021 © GPL3+

IoT Smart Safe Securiy

An alert system that sends a notification to your mobile phone when anyone accesses the safe.

IntermediateFull instructions provided4 hours241

Things used in this project

Hardware components

Particle Photon

Ultrasonic Sensor - HC-SR04 (Generic)

Jumper wires (generic)

Breadboard (generic)

USB-A to Mini-USB Cable

power brick 5V 1A

Software apps and online services

Particle Build Web IDE

Blynk

Story

This project is an IoT based Smart Security System for your safe. It is essentially

an alert system in which the device alerts us via mobile phone that someone is

accessing the safe. The process by which this is done is by interfacing a SoC IoT

board to an Ultrasonic Sensor that is used to measure the distance or

proximity of objects, and this board is programmed to retrieve the data from

the sensor and send it to the cloud. This cloud data can be viewed in your

mobile phone in all platforms including Android and IOS. Now we use the Blynk

cloud in this device and it is coded to send an alert to our mobile phone if the

distance value is more than a feet which means that if anyone tries to access it.

This IoT board requires Internet Connection to sustain this alerting. The

connectivity type which we use in this device is Wi-Fi. The IoT board which is

used here is Particle Photon and it has Inbuilt Wi-Fi connectivity.The cloud will

also automatically send an alert if this device goes offline during anytime or

reconnects to the Wi-Fi. Total control is established very easily to the user once

this device is setup. The board can be further customized to provide many

more functions as per the user’s need such as taking immediate action

automatically or something else entirely.

1 / 2 • Smart Safe Security

Send_Data_to_Blynk

// This #include statement was automatically added by the Particle IDE.
#include <blynk.h>

#define echoPin 2 // attach pin D2 Arduino to pin Echo of HC-SR04
#define trigPin 3 //attach pin D3 Arduino to pin Trig of HC-SR04
#define BLYNK_PRINT Serial

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "authtoken";


// defines variables
long duration; // variable for the duration of sound wave travel
int distance; // variable for the distance measurement

void setup() {
  pinMode(trigPin, OUTPUT); // Sets the trigPin as an OUTPUT
  pinMode(echoPin, INPUT); // Sets the echoPin as an INPUT
  Serial.begin(9600); // // Serial Communication is starting with 9600 of baudrate speed
  // Debug console

  delay(5000); // Allow board to settle
  Blynk.begin(auth);


}
void loop() {
  // Clears the trigPin condition
  digitalWrite(trigPin, LOW);

  // Sets the trigPin HIGH (ACTIVE) for 10 microseconds
  digitalWrite(trigPin, HIGH);

  digitalWrite(trigPin, LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  // Calculating the distance
  distance = duration * 0.034 / 2; // Speed of sound wave divided by 2 (go and back)
  // Displays the distance on the Serial Monitor
  Particle.publish("Distance",String (distance),60,PRIVATE);
  Serial.print("Distance: ");
  Serial.print(distance);
  Serial.println(" cm");
  delay(300);
  Blynk.run();
  
  if (distance>30) {
    Serial.println("Button is pressed.");

    // Note:
    //   We allow 1 notification per 5 seconds for now.
    Blynk.notify("Access Is done");
    }
}