Interfacing with DHT11 temperature + RH sensor

Thanks! It looks good... if you wanted, you could try formatting it like a module, and then we could add it so others can do var d = require("DHT11").connect(A0); d.read(callback). There's some info on that here.

I've quickly hacked it up but haven't tested so it's almost certainly buggy I'm afraid :)

The only strange bit is having to set var dht=this; because when you're in a timeout, this is set to something else.

function DHT11(pin) {
  this.pin = pin;
}

DHT11.prototype.read = function (a) {
    this.onreadf=a;
    this.i=0;
    this.out=0;
    this.badbits=0;
    digitalPulse(this.pin,1,0.08);
    var dht = this;
    setTimeout(function() {pinMode(dht.pin,'input_pullup');dht.watch=setWatch(function(t) {dht.onwatch(t);},dht.pin,{repeat:true});},0.07);
    setTimeout(function() {dht.onread(dht.endRead());},50);
};
DHT11.prototype.onread= function(d) {
    if (d.temp==-1) {
        dht.read(dht.onreadf);
    } else {
        dht.onreadf(d);
    }
};
DHT11.prototype.onwatch = function(t) {
    if (t.state) {
        this.pstart=t.time;
    } else {
        var tt=t.time-pstart;
        if (tt < 0.000044) {
            this.badbits = 1;
        }
        if (this.badbits) {
            this.out=(this.out<<1) | ((tt > 0.000044) && (tt < 0.0001));
        }
        this.i++;
    }
};
DHT11.prototype.endRead = function() {
    clearWatch(this.watch);
    if (this.badbits && this.i > 32) {
        rh=(this.out>>(this.i-10))&0xFF;
        temp=(this.out>>(this.i-26))&0xFF;
        return {"temp":temp,"rh":rh};
    } else {
        return {temp:-1,rh:-1};
    }
};

var d = new DHT11(C6);
d.read(function(a) { print(a); });

Looking at it, if it's not vital that you get exactly a 0.08ms pulse, I'd consider just writing:

pinMode(dht.pin,'output');
digitalWrite(dht.pin, 1);
setTimeout(function() {
  pinMode(dht.pin,'input_pullup');
  ...
}, 0.1);

I'm not sure if that does quite what you want - but it's not guaranteed that the setTimeout will happen at exactly the same time as the digitalPulse ends (because another task might jump in there first)