Получение данных с датчиков на arduino (i2c)

<script type="text/javascript">
  var otvet = "";
  var SDA = 0;
  var SCL = 2;
  var address = 0x80;
  function print(text, color) {
    document.body.innerHTML = text;
  }
  
  function createxmlhttp(method, path) {
    var xmlhttp = new XMLHttpRequest();  
    xmlhttp.open(method, localStorage["dhurl"] + "/device/" + localStorage["dhdeviceid"] + path, true);
    xmlhttp.setRequestHeader("Authorization", "Bearer " + localStorage["dhpassword"]);
    xmlhttp.setRequestHeader("Content-type", "application/json;charset=UTF-8");
    return xmlhttp;
  }
  
  function getres(id, callback) {
    var xmlhttp = createxmlhttp("GET", "/command/" + id);
    xmlhttp.onreadystatechange = function() {
      if(xmlhttp.readyState == 4){
          if(xmlhttp.status < 200 || xmlhttp.status> 299) {
            print("ERROR: Command result returned " + xmlhttp.status + " " + xmlhttp.responseText, "red");
          } else {
            var json = JSON.parse(xmlhttp.responseText);
            if(json['result'] == null || json['status'] == null) {
              getres(id, callback);
              return;
            }
            if(json['status'] != "OK") {
              print("Error - " + xmlhttp.responseText, "red");
              return;
            }
            if(callback != null)
              callback(json['result']['data']);
          }
      }
    }
    xmlhttp.send("");
  }
  
  function get_data(size, callback) {
    var xmlhttp = createxmlhttp("POST", "/command");
    xmlhttp.onreadystatechange = function() {
        if(xmlhttp.readyState == 4){
            if(xmlhttp.status < 200 || xmlhttp.status> 299) {
              print("ERROR: Can not read data " + xmlhttp.status + " " + xmlhttp.responseText, "red");
            } else {
              getres(JSON.parse(xmlhttp.responseText)["id"], callback);
            }
          }
        } 
    xmlhttp.send(JSON.stringify({"command":"i2c/master/read", "parameters":{"SDA":SDA, "SCL":SCL, "address":"0x" + address.toString(16), "count":size}}));
  }
  
  function write_register(register, callback) {
    var xmlhttp = createxmlhttp("POST", "/command");
    xmlhttp.onreadystatechange = function() {
        if(xmlhttp.readyState == 4){
            if(xmlhttp.status < 200 || xmlhttp.status> 299) {
              print("ERROR: Can not write register " + xmlhttp.status + " " + xmlhttp.responseText, "red");
            } else {
              getres(JSON.parse(xmlhttp.responseText)["id"], callback);
            }
          }
        } 
    data = btoa(String.fromCharCode(register));
    xmlhttp.send(JSON.stringify({"command":"i2c/master/write", "parameters":{"SDA":SDA, "SCL":SCL, "address":"0x" + address.toString(16), "data":data}}));
  }
  
  function unsignedInt16(data, pos) {
    return data.charCodeAt(pos) * 256 + data.charCodeAt(pos + 1);
  }
  
  function temprecevied(base64) {
    var data = atob(base64);
    outHumi = unsignedInt16(data, 0);
    valueHumi = 175.72*outHumi/65536 - 46.85; 
    otvet += valueHumi.toFixed(3);
    print(otvet, "green");
  }
  
  function measurerecevied(base64) {
    var data = atob(base64);
    outHumi = unsignedInt16(data, 0);
    valueHumi = 125.0*outHumi/65536 - 6; 
    otvet += valueHumi.toFixed(3) + ":";
    temp();
  }
  
 function readtemp(emptydata) {
    setTimeout(function() {get_data(2, temprecevied);}, 210);   
  } 
 
 function readmeasure(emptydata) {
    setTimeout(function() {get_data(2, measurerecevied);}, 210);   
  }
  
  function temp() {
    write_register(0xE0, readtemp);  
  }
  
  function measure() {
    write_register(0xE5, readmeasure);  
  }
  localStorage["dhurl"] = "---------";
  localStorage["dhdeviceid"] = "---------";
  localStorage["dhpassword"] = "---------";
  measure();
  </script>