SSD1306 OLED - sample code isn't working

Ahh - I just tried this, and it does appear to be a bug in Espruino.

I believe it happens when you use clearInterval() (with no arguments) and debounce in a watch, as debounced watches use setTimeout behind the scenes. I'll get a fix in for this.

In the mean time, you can work around it by only clearing the interval you want:

// ...
var intr;
function interval(){
  intr = setInterval(read,500);
}
function interval2(){
  intr = setInterval(read2,500);
}
function display(){
  if(screen === 1)interval();
  if(screen === 0)interval2();
  //console.log(screen);
}

setTimeout(function(){
  display();
},2000);

setWatch(function(e) {
  if (intr) clearInterval(intr);
  intr = undefined;

  display();
  console.log(screen);
  screen = screen + 1;
  if(screen > 1) screen = 0;
}, BTN1, {repeat: true, edge: 'rising', debounce:50});