function updateData() {
      console.log("Fetching Data from ESP...");
      var xhttp = new XMLHttpRequest();
      xhttp.onreadystatechange = function() {
       if (this.readyState == 4 && this.status == 200) {
        console.log("Data:", this.responseText);
        var values = JSON.parse(this.responseText);
        document.getElementById("voltage").innerHTML = values.voltage;
        document.getElementById("current").innerHTML = values.current;
		document.getElementById("power").innerHTML = values.power;
		document.getElementById("Ah").innerHTML = values.Ah;
		document.getElementById("Wh").innerHTML = values.Wh;
		document.getElementById("battery").innerHTML = values.battery;
		document.getElementById("run").innerHTML = values.run;
       }
      };
      xhttp.open("GET", "/meas/values", true);
      xhttp.send();
     }
      updateData();
      window.setInterval(updateData, 3000);