Published November 23, 2019 © GPL3+

MEGR 3171 - Fall 2019 - Shower Temperature Measurement

This project involves incorporating two particle argon devices and measuring the ideal shower temperature.

BeginnerShowcase (no instructions)15 hours609

MEGR 3171 - Fall 2019 - Shower Temperature Measurement

Things used in this project

Hardware components

Particle Argon

USB-A to Micro-USB Cable

Breadboard (generic)

Resistor 220 ohm

Resistor 10k ohm

Adafruit 10K Precision Epoxy Thermistor

Jumper wires (generic)

LED (generic)

Red, Green, Yellow

Software apps and online services

ThingSpeak API

Particle Build Web IDE

Hand tools and fabrication machines

Wire Stripper & Cutter, 18-10 AWG / 0.75-4mm² Capacity Wires

Story

Prologue

Everyone knows the pain of getting in a shower that is too cold or scalding hot. No longer will this be an issue with our project. It utilizes two Particle Argons communicating with each other, and displaying different lights to find a temperature that is just right for you.

HowItWorks

One argon will have an epoxy thermistor that is placed under the shower head and will be constantly taking temperature data as the water runs. The temperature will be gathered roughly every 5 seconds. Once the temperature has been gathered, two things will happen. First, the argon will talk to the second argon that has the different colored lights. Secondly, the temperature data will be delivered to a real-time graph. The average temperature for a shower is roughly 41°C, however we have made a range from 37° - 43°C for a satisfactory spectrum. If the temperature is below 37°C, the yellow light will activate meaning that is too cold. If the reading is above 43°C, then the red light will turn on indicating that the water is too hot. Otherwise, the green light will be on meaning that the temperature is just right. If the temperature range set in our code does not agree with your desire, you may go and alter our code that is provided.

Video

The following video gives a visual representation of how our project operates while explaining some specifics.

IOT Project Video

Graph

Below is a graph that shows the real time data collected by the Argon as it reads the temperature. This data can be accessed through ThingSpeak which is a live graphing application.

Code

#include <math.h>

int ThermistorPin = A5;
int Vo;
double R1 = 9970;
double logR, R2, T, Tc;
double c1 = 0.001129148, c2 = 0.000234125, c3= 0.0000000876741; 

void setup() {
   pinMode(D7, OUTPUT);
    Particle.subscribe ("light_on_accr", Lightaccr);
    pinMode (ThermistorPin, INPUT);
}

void loop() {
  // Gets data from the Thermistor and converts it into usable temperature data
  Vo = analogRead(ThermistorPin);
  R2 = R1/(4096.0/((double)Vo-1));
  logR = log(R2);
  T = (1.0 / (c1 + (c2 * logR) + c3 *( logR * logR * logR)));
  Tc = T - 273.15; 
  // Sends the data to the other argon
  Particle.publish("accr_temperature", String(Tc));
  //Sends the data to the live graph
  Particle.publish("temperature_in_C", String(Tc));
  // Wait 15 seconds
  delay(15000);
}
 // Acknowledgement that the data was received by the other Argon
void Lightaccr(const char *eventName, const char *data)
{ 
    digitalWrite(D7, HIGH);
 }

float V=1;
int led1;
void setup() {
    pinMode(D6, OUTPUT);
    pinMode(D5, OUTPUT);
    pinMode(D4, OUTPUT);
    Particle.subscribe ("accr_temperature", Light);
}
 // Turns on the lights depending on the temperature range
void Light(const char *event, String data) {
    led1=data.toInt();
    if (led1<=37.7){
        digitalWrite(D6, HIGH);
        digitalWrite(D5, LOW);
        digitalWrite(D4, LOW);
    }
    else if (led1>=37.7 && led1<= 43.3){
        digitalWrite(D5, HIGH);
        digitalWrite(D4, LOW);
        digitalWrite(D6, LOW);  
    
    }
    else if (led1 >= 43.3){
        digitalWrite(D4, HIGH);
        digitalWrite(D5, LOW);
        digitalWrite(D6, LOW);   
    }
    else {
        digitalWrite(D6, LOW);
        digitalWrite(D5, LOW);
        digitalWrite(D4, LOW);
    }
    String connect = String(V);
Particle.publish("light_on_accr");

}

Credits

Connor Rice

1 project • 0 followers

Alexa Caldwell

1 project • 0 followers

Thanks to Kyle Tucker, Dylan Duplessis, Jerry Autry, and Douglas Lawrence .

MEGR 3171 - Fall 2019 - Shower Temperature Measurement