The Story

Weston Bartlett, Gunner Molek, O'Hodge Garvin

Published December 1, 2022

Pet Monitoring System

Temperature, food, and water bowl level sensors to make sure your pets are taken care of when you are away.

BeginnerFull instructions provided20 hours78

Things used in this project

Hardware components

Arduino Ky-028 Digital Temperature Sensor

Ultrasonic Sensor - HC-SR04 (Generic)

Adafruit Water Level Sensor

Jumper wires (generic)

Particle Argon

Resistor 100 ohm

Story

The Story

It can be stressful leaving your pet behind when you need to go to work or go away for the weekend. The pet monitoring system helps ease that stress by keeping you up to date on your pets status. The three piece sensor system sends notifications to your phone when your pet is in need of food or water. The system also notifies you the live temperature in your home and will ping your phone if it is too hot or cold depending on the season.

Video Demonstration

FoodLevelSensor

An Ultrasonic Sensor uses sound waves to determine the level of food present in a bowl. The user can set the threshold level in which the code triggers "FoodLow" which sends a notification to your phone. Depending on the size of the bowl the distance will change. The Ultrasonic Sensor requires 5V of power to run. In the interest of time and money we used the myDAQ device as a power supply but there are more space efficient ways of powering the sensor such as a portable charger.

Ultrasonic Sensor Setup

The distance data was graphed via adafruit and is shown below.

Food Level Sensor Graph

TemperatureSensor

The thermistor based temperature sensor (Ky-028) will record the temperature of the room. The user can set a value in the code in which "TempThreshold" is triggered and you are notified. The live temperature graph can be viewed on adafruit.io. The temperature sensor runs on 3.3V of power so the argon output was sufficient.

Temperature Sensor Setup

To show that this sensor works data collection was started inside and then the sensor was placed outside. The graph of live data below shows the result. The thermistor is properly measuring temperature.

Temperature Measurement Test

WaterLevelSensor

The water Level sensor uses a bobber to detect when the water is low. When the water is low the circuit will be completed which will prompt a webhook to your phone. The water level sensor also runs on 3.3V power from the argon power port.

Water Level Sensor Setup

Because the water level sensor is built off of completing a circuit, it is either on or off. The spikes in the live data graph shown below indicate that the water is low at those points.

Water Level Sensor Live Data

Cross Communication

While the communication of the three argons was not necessary to make our project function, it was required to be demonstrated. To do this we created a new variable called "GotIt" to prove that the argons were talking to each other. We had one argon publish the "GotIt" data and the other two were subscribed to this data. As shown below the "GotIt" data appeared in the console of the other two argons. Shown below is the code from the water level sensor (See code section for full code) which publishes our variable.

GotIt Particle Publish Code

And then the other two codes subscribe to it:

Food Level Sensor Subscribe Code

This resulted in the "GotIt" data showing up in between the measurements that the particular argon was taking. For example the food level would output a distance measurement followed by "GotIt" and then another distance measurement. The temperature sensor behaved the same way.

Temperature Sensor Receiving GotIt Variable

Code

#include <math.h>
// Declaration and initialization of the input pins
int Analog_Input = A0; // Analog output of the sensor
int Digital_Input = 3; // Digital output of the sensor
float TempreadKelvin;
float TempreadCelcius;
float TempreadF;
float TemperatureHigh;


void setup ()
{
  pinMode (Analog_Input, INPUT);
  pinMode (Digital_Input, INPUT);
       
  Serial.begin (9600); // Serial output with 9600 bps
}
  
// The program reads the current values of the input pins
// and converts them to voltage and then to temperature
void loop ()
{
  float Analog;
  int Digital;
    
  //Actual values are read, converted to the voltage value....
  Analog = analogRead (Analog_Input) * (3.3 / 4095.0); 
  Digital = digitalRead (Digital_Input);
  
  //Assuming constant current (I = 1A to make calcualtions easier) this means that outputvoltage = resistance for a given temp measurement
  //A = 0.005997 B = -0.005210 C = 0.003081; 
  TempreadKelvin = 1.0/(0.0059973329-0.0052101143*log(Analog)+0.0030811518*pow(log(Analog), 3));
  TempreadCelcius = TempreadKelvin-273.15;
  TempreadF = (TempreadCelcius*1.8)+32;
  
  //Insert the temperature in which you want to be notified. Use > or < to determine if notification will be for values greater than or less than the specified value
  if(TempreadF<65)
  {
      Serial.println (" reached");
      Particle.publish("TemperatureThreshold", String(TemperatureHigh));
     delay(30000);
  }
  else
  {
      
      Serial.println (" not yet reached");
      Particle.publish("Temperature", String(TempreadF));
      delay(2300);
  }

 Particle.subscribe("CommsCheck", "GotIt", ALL_DEVICES); 
  
}

//Defining variables
float duration, cm, setdistance, setdistanceinch, diff, FoodLow;
int trigPin = 2;
int echoPin = 6;


void setup()
{
  
    pinMode(trigPin, OUTPUT);
    pinMode(echoPin, INPUT);
   // Particle.subscribe("ClayPetersonLED",LEDOn,"4b0023000351353530373132");

    Serial.begin(9600);
}

void loop()
{
     //lines 23 - 30 output and collect the soundwave, get a duration in
    //terms of microseconds, convert that time to distance since we know how fast sound travels
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(100);
    digitalWrite(trigPin, LOW); 
    duration = pulseIn(echoPin, HIGH);
    cm = (duration/2) / 29.1; //divides time in half because the wave goes to target and back. 29.1cm/millisecond converts the time to distance in centimeters.
    
    if(cm > 8)
    {
        Particle.publish("FoodLow", String(FoodLow));
        delay(30000);
    }
    else
    {
       Particle.publish("Distance", String(cm));
       delay(5000);
    }
    Particle.subscribe("GotIt", ALL_DEVICES);
}

int analogPin = A1;
int level = 0;
int TempInt =0; //global int var
int Dist =0;//float receivedfloat = 0; //global float variable
int FoodLow =0;


void setup()
{
    Particle.variable("Water Level", level);
    pinMode(analogPin, INPUT);
}


void loop()
{

    level = analogRead(analogPin);
    delay(200);

    if (level>8)
    {
        
        Particle.publish("Water Level", String(level));
       
    }
    else 
    {
    
    Particle.publish("Water Level", String(level));
    }
    delay(500);
    
   Particle.publish("CommsCheck","GotIt", PRIVATE);
  
    delay(500);
}

Pet Monitoring System

Things used in this project

Hardware components

Story

The Story

Schematics

Food Level Sensor

Temperature Sensor

Water Level Sensor Diagram

Code

Temperature Sensor

Food Level Sensor

Water Level Sensor

Credits

Weston Bartlett

Gunner Molek

O'Hodge Garvin

Comments

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Pet Monitoring System

Pet Monitoring System

Things used in this project

Hardware components

Story

The Story

Schematics

Food Level Sensor

Temperature Sensor

Water Level Sensor Diagram

Code

Temperature Sensor

Food Level Sensor

Water Level Sensor

Credits

Weston Bartlett

Gunner Molek

O'Hodge Garvin

Comments

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