Javascript to read temperature with LM335, using PyArduinoProxy

read-temperature-with-lm335.js

/***********************************************************************
 * First example. Testing how to use LM335 to read temperature,
 * using PyArduinoProxy.
 ***********************************************************************/

var value = proxy.analogRead(0);
logMessage("analogRead(): " + value);

var volt = (5.0/1024.0) * value;
logMessage("volt: +" + volt +"V");

var kelvin = volt * 100; // 0.01V -> 1º K -> ºK = volt / 0.01
logMessage("K: " + volt * 100);

// C = K-273
logMessage("C1: " + (kelvin-273));

logMessage("C2: " + ((((5.0/1024.0)*proxy.analogRead(0))*100)-273));

/***********************************************************************
 * Second exampe. Using javascript functions.
 ***********************************************************************/

function readTemp(analogPort) {
    var value = proxy.analogRead(analogPort);
    var volt = (5.0/1024.0) * value;
    var kelvin = volt * 100;
    return (kelvin - 273); // return temp. in celcius
}

logMessage("Temp. on A0: " + readTemp(0));
logMessage("Temp. on A2: " + readTemp(2));

/***********************************************************************
 * Use 'toFixed()' to get a better formatting
 ***********************************************************************/

logMessage("Temp. on A0: " + readTemp(0).toFixed(1) + "º C");
logMessage("Temp. on A2: " + readTemp(2).toFixed(1) + "º C");