Published November 22, 2019 © GPL3+

IOT Project: Text Theft Alarm with Light Sensing

This IOT project is used to collect data and notify the user when a safe or lockbox has been opened.

BeginnerFull instructions provided1 hour854

IOT Project: Text Theft Alarm with Light Sensing

Things used in this project

Hardware components

Particle Argon

Photo resistor

Resistor 220 ohm

Software apps and online services

Particle Build Web IDE

ThingSpeak API

IFTTT

Story

Introduction

We created an internet of things project that has two way communication between Particle Argons. These two argons will notify the user when a safe or lockbox has been opened. This is done using a IFTTT app, Groupme and Thingspeak. One of the argons has a photoresistor that monitors the light level. The other argon is used to communicate with IFTTT to send a notification to Groupme. One of the argons will also send data to a chart in Thingspeak.

Project Description

This project uses a photoresistor to constantly monitor the light level of a point of interest. The Argon in the point of interest is programmed to take an analog reading of the pin connected to the photoresistor and publish that value to Thingspeak so that a chart can be made of light level readings over time. The read value is then compared to a preset threshold value in an IF statement to determine if the door has been opened. If this is true, the Argon publishes an event titled "lightlevelchanged49" which is recieved by Argon 2 in a subscibe function. Argon 2 will then send a text via Groupme saying that the door has been opened. After this, the Argon will publish another event titled "subscription_received49" and blink its D7 LED until Argon 1 has detected that the door is closed. Particle 1

Thingspeak channel: https://thingspeak.com/channels/912527

Code

#define LIGHT_PIN A0 // Replace A0 with your pin
#define LIGHT_LEVEL_THRESHOLD 300  // Replace with your own light level
#define THRESHOLD_SENSITIVITY 100 // higher number = lower sensitivity, lower number = higher sensitivity
#define publish_delay 15000
unsigned int lastPublish = 0;
int lightlevelchanged49;
TCPClient client;
void setup() {
Particle.variable("lightlevelchanged49",&lightlevelchanged49,INT);
Particle.subscribe("subscription_recieved49", myHandler);
}
void loop() {
   int darkness = analogRead(LIGHT_PIN);
   Particle.publish("ThingSpeakWrite_", "{ \"1\": \"" + String(darkness) + "\", \"k\": \"Y6SKGBD57EBDOT63\" }", 60, PRIVATE);
   if (darkness >= LIGHT_LEVEL_THRESHOLD) {
       Particle.publish("lightlevelchanged49", "light");
   }
      delay (3000);
   }
void myHandler(const char *lightlevelchanged49, const char *data)
{
    digitalWrite(D7,HIGH);
    delay(200);
    digitalWrite(D7,LOW);
}

Credits

Cameron Klovstad

1 project • 1 follower

Ryan Williams

1 project • 0 followers

IOT Project: Text Theft Alarm with Light Sensing