science.html

<h1 id="page-title">CO2 Calculation</h1>
<p>Select the ppm in the first box, and the lux in the second</p>
<select id="ppm" onchange="calculatePpm()">
    <option value="0">0</option>
    <option value="300">300</option>
    <option value="600">600</option>
    <option value="1200">1200</option>
  </select>
  <select id="lux" onchange="calculateLux()">
    <option value="5000">5000</option>
    <option value="15000">15000</option>
    <option value="25000">25000</option>
  </select>

  <button onclick="calculate()">Re-run</button>
<p id="result"></p>
<script>
    var freqArr = [[[0,0],[4,3],[9,4],[13,6]],[[0,0],[9,4],[13,6],[17,6]],[[0,0],[10,5],[17,6],[19,6]]];

    var Ppm = 0;
    var Lux = 5000;
    var lLev = 1;//hanges with light level
    var cLev = 0;//changes with ppm
    
                function calculatePpm(){
                                Ppm = document.getElementById("ppm").value;
                                if(Ppm=='0') cLev=0;
                                else if(Ppm=='300') cLev=1;
                                else if(Ppm=='600') cLev=2;
                                else if(Ppm=='1200') cLev=3;       
                                
                                calculate();
                }
                function calculateLux(){
                                Lux = document.getElementById("lux").value;
                               if(Lux=='5000') lLev=0;
                                else if(Lux=='15000') lLev=1;
                                else if(Lux=='25000') lLev=2;

                                calculate();
                }
                function calculate(){
                                var b1 = freqArr[lLev][cLev][0];
                                var b2 = freqArr[lLev][cLev][1];
                
                                
                                var numBubs = b1 + Math.floor(b2 * Math.random());
                                var timeBub = Math.ceil(60000 / (numBubs+1));
                                console.log(numBubs);
                                console.log(timeBub);
                                document.getElementById("result").innerHTML = numBubs;
                }
                calculate();
</script>