Making a grilling station: a few Puck.js questions

here's the code btw - very quick and dirty as i was experimenting late at night :)

var temperatura;
var spi = new SPI();
spi.setup({mosi:D2, miso:D1, sck:D27});

SPI1.setup({ sck:D31, mosi:D30, order: "lsb", baud: 4000000 });

//SPI1.setup({ miso:D1, sck:D27, baud:60000 });
var sensor=require("MAX31855").connect(spi,D2);
var temper= sensor.getTemp();
console.log(temper);
console.log(temper.temp);

var g = require("MemoryLCD").connect(SPI1, D29/*SCS*/, D28/*EXTCOMIN*/, 144/*width*/, 168/*height*/);



function onTimer() {
  temper= sensor.getTemp();
  temperatura= temper.temp.toFixed(1);
  g.clear();
  g.setFontVector(50);
//  g.drawString("Hello WORLD",30,70);
  g.drawLine(0,30,g.getWidth(),30);
  g.drawLine(0,31,g.getWidth(),31);
  g.drawLine(0,137,g.getWidth(),137);
  g.drawLine(0,138,g.getWidth(),138);
  g.drawString(temperatura, 0, 55);
  g.setFontVector(20);
  g.drawString("Battery: "+Puck.getBatteryPercentage(), 0, 143);
  g.flip();
}

// Update temperature every 2 seconds
setInterval(onTimer,10000);
// Update temperature immediately
onTimer();