text: var ctx = $("#temperature")[0].getContext('2d');
  var myChart = new Chart(ctx, {
      type: 'line',
      data: {
          labels: ["", "", "", "", "", ""],
          datasets: [{
              label: 'Temperature',
              data: tempdata,
              borderWidth: 1
          }]
      },
  });
  
  var ctx2 = $("#pressure")[0].getContext('2d');
  var myChart = new Chart(ctx2, {
      type: 'line',
      data: {
          labels: ["", "", "", "", "", ""],
          datasets: [{
              label: 'Pressure',
              data: presdata,
              borderWidth: 1
          }]
      },
      options: {
      }
  });
  
  var ctx3 = $("#humidity")[0].getContext('2d');
  var myChart = new Chart(ctx3, {
      type: 'line',
      data: {
          labels: ["", "", "", "", "", ""],
          datasets: [{
              label: 'Humidity',
              data: humdata,
              borderWidth: 1
          }]
      },
      options: {
      }
  });
  
  var ctx4 = $("#co2")[0].getContext('2d');
  var myChart = new Chart(ctx4, {
      type: 'line',
      data: {
          labels: ["", "", "", "", "", ""],
          datasets: [{
              label: 'Co2',
              data: co2data,
              borderWidth: 1
          }]
      },
      options: {
      }
  });
  