interfacing a MCP9701

DrAzzy, yes the temp is averaging around -20C. I don't think it is a wiring issue. I was getting positive readings before I attempting to implement some kind of averaging temp reading. Well, I just made a liar out of myself. I went back to my original code without the averaging stuff and I am still receiving negative readings.

Original code:

function onInit() {
  var phValue="";

  Serial4.setup(38400);

  Serial4.onData(function (e) {
    phValue+=e.data;

    if (e.data == "\r") {
      console.log(phValue);
      phValue="";
    }
  });

  function getResTempValue() {
    var vOut = E.getAnalogVRef() * analogRead(A0); // if you attached VOUT to Ao
    var vZero = 0.4;
    var tCoeff = 19.5 / 1000;
    var temp = (vOut - vZero) / tCoeff;
    console.log(temp);

    return temp.toFixed(2);
  }

  function getPhValue() {
    var rescomp="";
    var pfloat="";
    //on = !on;
    //digitalWrite(LED1, on);
    rescomp = getResTempValue();
    pfloat = parseFloat(rescomp);
    console.log("Temp: " + pfloat);
    Serial4.print(rescomp+"\r");
    //Serial4.print("r\r");
  }

  function phCalibrate4() {
  }

  function phCalibrate7() {
  }

  function phCalibrate10() {
  }

  var interval = setInterval(getPhValue, 5000);
}

onInit();