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COI - Temperature Monitor

You will need an Intel Edison for Arduino, a Grove Starter Kit Plus and a computer with the Edison-Arduino IDE installed.

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COI - Temperature Monitor

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Code

Temperature_Mood_Lighting.ino

Arduino
#include <Wire.h>
#include <rgb_lcd.h>
#include <math.h>
rgb_lcd lcd;

int tempSense = 0;
int B=3975; //This is a constant used to convert between the thermistor resistance in the temperature sensor and the actual temperature in Celcius.
double minTemp = 10;
double ideal = 20;
double maxTemp = 25;

void setup() {
  lcd.begin(16, 2);
  lcd.setRGB(255, 255, 255);
  pinMode(tempSense, INPUT);
}

void loop() {
  lcd.setCursor(0,0);
  lcd.print("                                ");//32 spaces clears screen of all text - deals with text offset glitches
  lcd.setCursor(0,0);
  double read = analogRead(tempSense);
  double resistance=(float)(1023-read)*10000/read; 
  double temperature=1/(log(resistance/10000)/B+1/298.15)-273.15;
  lcd.print(temperature);
  
  //Set the color gradient
  temperature = min(temperature, maxTemp);
  temperature = max(temperature, minTemp);
  double fraction;
  if(temperature < ideal){
    fraction = (ideal - temperature) / (ideal - minTemp) * .5 + .5;
  } else {
    fraction = (maxTemp - temperature)/(maxTemp-ideal) * .5;
  }
  int r = 0;
  int g = 0;
  int b = 0;
  double quarter = 1.0/4.0;
  if(fraction < quarter){
    r = 255;
    g = (int)((fraction)/quarter * 255);
  } else if(fraction < 2 * quarter){
    r = (int)((2 * quarter - fraction)/quarter * 255);
    g = 255;
  } else if(fraction < 3 * quarter){
    g = 255;
    b = (int)((fraction-2*quarter)/quarter * 255);
  } else{
    g = (int)((4 * quarter - fraction)/quarter * 255);
    b = 255;
  }
  
  //Set LCD Colors
  lcd.setRGB(r,g,b);
  
  delay(500);//Wait half a second.
}

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