relay.js

const matrix = require("@matrix-io/matrix-lite");
var methods = {}; //methods object
var relayPin1 = 0;
var relayPin2 = 1;
//initialize the global variables//
var currentTemperature = 20; //store the current temperature
//create the offset temperatures (usually 1 degree above and below the desired temperature)
var temperatureOffset1 = 0;
var temperatureOffset2 = 0;
//create variables that hold the humidity and pressure temperature sensor readings
var humidityTemperature = 0;
var pressureTemperature = 0;
var waitingToggle = false;
var lowestTemperature = 10; //holds the lowest temperature wanted (be mindful of farenheit /celsius conversions)
var highestTemperature = 30; //holds the highest temperature wanted (be mindful of farenheit /celsius conversions)
var list = ['blue'];
matrix.gpio.setFunction(relayPin1, "DIGITAL");
matrix.gpio.setFunction(relayPin2, "DIGITAL");
matrix.gpio.setMode(relayPin1, "output");
matrix.gpio.setMode(relayPin2, "output");
matrix.gpio.setDigital(relayPin1, "ON");
matrix.gpio.setDigital(relayPin2, "ON");
setInterval(function(){
   humidityTemperature = matrix.humidity.read().temperature;
   pressureTemperature = matrix.pressure.read().temperature;
   currentTemperature = (humidityTemperature + pressureTemperature)/2 - 13;
   //console.log(currentTemperature);
},50);
methods.sleep = function(milliseconds) {
   var start = new Date().getTime();
   while ((new Date().getTime() - start) < milliseconds){
   }
 }
setInterval(function(){
   if (!waitingToggle) {
       matrix.led.set({});
       list = ['blue'];
   };
   // Creates pulsing LED effect
   if (waitingToggle) {
       if(list.length < 35){
       for (var i = 0; i < 35; ++i) {
           // Set individual LED value
           matrix.led.set(list);
          methods.sleep(10);
          list.push('blue');
       }
   }
}
},50);
methods.startWaiting = function() {
   waitingToggle = true;
 };
 methods.stopWaiting = function() {
   waitingToggle = false;
 };
methods.makeTemp = function(temp1, temp2){
   //set the first and second temperature offsets to a degree greater and less than the desired temperature
  temperatureOffset1 = temp1;
  temperatureOffset2 = temp2;
  if(currentTemperature < temperatureOffset1)
  {
          //set the first relay on and turn off the other
          matrix.gpio.setDigital(relayPin1, "OFF");
          matrix.gpio.setDigital(relayPin2, "ON");
          //log the current temperature and the offsets
          console.log(currentTemperature);
          console.log(temperatureOffset1);
          console.log(temperatureOffset2);
          //wait a second and then call the makeTemp function again to check the temperature
          setTimeout(function(){
             methods.makeTemp(temperatureOffset1,temperatureOffset2);
          }, 1000);
  }
  else if(currentTemperature > temperatureOffset2)
  {
          //set the second relay on and turn off the other
          matrix.gpio.setDigital(relayPin1, "ON");
          matrix.gpio.setDigital(relayPin2, "OFF");
          //log the current temperature and the offsets
          console.log(currentTemperature);
          console.log(temperatureOffset1);
          console.log(temperatureOffset2);
          //wait a second and then call the makeTemp function again to check the temperature
          setTimeout(function(){
             methods.makeTemp(temperatureOffset1,temperatureOffset2);
          }, 1000);
  }
  else{
      //log the current temperature
      console.log(currentTemperature);
      //turn off both relays
       matrix.gpio.setDigital(relayPin1, "ON");
       matrix.gpio.setDigital(relayPin2, "ON");
      //after a second check the temperature again for any changes
      setTimeout(function(){
          methods.makeTemp(temperatureOffset1,temperatureOffset2);
       }, 1000);
  }
};
methods.currentTemperature = function(){
  return currentTemperature;
}
methods.tellTemp = function(){
   var list = ["blue"];    
   for (var i = 0; i < 35; ++i){
       if((currentTemperature <= highestTemperature && currentTemperature >= lowestTemperature))
       {
           if(i <= ((currentTemperature-lowestTemperature)*(35/(highestTemperature-lowestTemperature)))) //represent temperature through leds
           {
               matrix.led.set(list);
               list.push({
                   r: (255)/(Math.exp(-0.3*i+5)+1) - 1,
                   g: 0,
                   b: -255/(Math.exp(-0.3*i +5) +1) +255,
                   w: 0
                   });
           }
           else{
               //make the rest of the leds blank
               matrix.led.set(list);
               list.push({});
           }
       }
   }
       if(currentTemperature > highestTemperature)
       {
           //change all leds to red
           matrix.led.set("red");
       }
       else if(currentTemperature < lowestTemperature)
       {
           //change all leds to blue
           matrix.led.set("blue");
       }
};
module.exports = methods;
// Export methods in order to make them avaialble to other files