Serial port query, response ?

Hi,

Rather than polling, this is where you want to use callback functions...

You can call a function that will handle your serial data when it is received, for example:

Serial1.on("data",function(data) {
  buffer += data;
  var i = buffer.indexOf("\r");
  while (i>=0) {
    dataReceived(buffer.substr(0,i)); // <-------  
    buffer = buffer.substr(i+1);
    i = buffer.indexOf("\r");          
    comState = 2;
  }
});

function dataReceived(str) {
  var a = Number(str);
  if(a==12.3) {LED1.write(1);} else {LED1.write(0);}
  if(a==23.4) {LED2.write(1);} else {LED2.write(0);}
  if(a==34.5) {LED3.write(1);} else {LED3.write(0);}
}

function getTemp(arg){
  Serial1.print("NTC,"+arg+"\r");
};

setInterval(getTemp, 1000); // ask for temperature every second

It'll be much more power efficient, since the board is only waking up when it has something to do. Generally you shouldn't ever really need a loop function in Espruino.

Hope that helps! In the code above, it'll ask for temperature every 1 second regardless of whether there was a response - but often this is a good idea. If the temperature sensor doesn't respond (or doesn't get the data) for whatever reason, you don't want the Espruino board to stay waiting for it!