New joint DHT11/DHT22 module

When I saw you have a lot of trouble with DHT22 and the like. I decided to look into it.
So I took the datablad, and made a simulator in my propeller from Parallax.
I don't have this sensor, so I don't know if it will work.
Then I took Gordon's proposals and twisted a bit. See post #1

My connection between esp8266-01 and propeller are via a resistor of 330ohm, just to be safe.
I chanced the time from 6ms to 20ms. On my system, if I am under 13 ms I begin to lose pulses.

Try it and see if it can be used.

// DHTxx_01 - esp8266-01

// Sensor object constructor
function HT(device, pin) {
  this.device = device;
  this.pin = pin;
}
// sensor query method...
/** read sensor as either...
      read(callback);
      read(callback,number_of_tries); - default=3
      */
HT.prototype.read = function (cb,n) {
  if (!n) n=3;
  var d = ""; 
  var ht = this;
  pinMode(ht.pin); // set pin state to automatic
  digitalWrite(ht.pin,0);
  this.watch = setWatch(function(t) {
    d+=0|(t.time-t.lastTime>0.00005); // 030, 070 usec (time in sec) // PB
  }, ht.pin, {edge:'falling',repeat:true} );
  setTimeout(function() {pinMode(ht.pin,'input_pullup');},1); // (time in msec) // PB
  setTimeout(function() {
    clearWatch(ht.watch);
    delete ht.watch;
	//00+0000 0010 1000 1100 0000 0001 0101 1111 1110 1110
	//00+0000 0010 1000 1100 1000 0000 0110 0101 0111 0011
	//   r                   t                   c 
	//d='00'+'0000001010001100000000010101111111101110'; // rh=65.2 t= 35.1
	//d='00'+'0000001010001100100000000110010101110011'; // rh=65.2 t=-10.1
	//d='00'+'0000001010001100000000000110010111110011'; // rh=65.2 t= 10.1
    var cks = 
        parseInt(d.substr(2,8),2)+
        parseInt(d.substr(10,8),2)+
        parseInt(d.substr(18,8),2)+
        parseInt(d.substr(26,8),2);
    if (cks&&((cks&0xFF)==parseInt(d.substr(34,8),2))) {
      var o = { raw:d };
      if (ht.device=="DHT11") {
        o.rh = parseInt(d.substr(2,8),2);
        o.t = parseInt(d.substr(18,8),2);
      } else {
        o.rh = parseInt(d.substr(2,16),2)*0.1;
        //o.t = parseInt(d.substr(19,15),2)*0.2*(d[18]-0.5);
        o.t = parseInt(d.substr(19,15),2)*0.2*(0.5-d[18]); // PB
      }
      //cb(o);
      cb({o:o, n:n}); // PB

    } else {
      if (n>1) setTimeout(function() {ht.read(cb,--n);},500);
      //else cb({err:true, raw:d});
      else cb({err:true, checksumError:cks>0, raw:d, temp:-1, rh:-1, n:n});
    }
  //},6);
  },20); // time in msec (min 15 virker) 6 20 // PB
};


//*************** start here ******************
// esp8266
var ESP8266 = require('ESP8266');
//ESP8266.setCPUFreq(80);
console.log(ESP8266.getState());


// Test with
var dht = new HT("DHT22",D0);
setInterval(function() {
  dht.read(print);
},3000);

TVE's firmware downloaded today and used in the test.

 _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v85.1127 Copyright 2016 G.Williams
Espruino is Open Source. Our work is supported
only by sales of official boards and donations:
http://espruino.com/Donate
Flash map 512KB:256/256, manuf 0xc8 chip 0x4013
>echo(0);
{
  "sdkVersion": "1.5.3(aec24ac9)",
  "cpuFrequency": 160, "freeHeap": 10296, "maxCon": 10,
  "flashMap": "512KB:256/256",
  "flashKB": 512,
  "flashChip": "0xc8 0x4013"
 }
=undefined
{
  "o": {
    "raw": "010000000001001101000000010101111110101101",
    "rh": 7.7, "t": 35.1 },
  "n": 3 }
{
  "o": {
    "raw": "010000000001001110000000010101111110101110",
    "rh": 7.8, "t": 35.1 },
  "n": 3 }
{
  "o": {
    "raw": "010000000001001111000000010101111110101111",
    "rh": 7.9, "t": 35.1 },
  "n": 3 }
{
  "o": {
    "raw": "010000000001010000000000010101111110110000",
    "rh": 8, "t": 35.1 },
  "n": 3 }
{
  "o": {
    "raw": "010000000001010001000000010101111110110001",
    "rh": 8.1, "t": 35.1 },
  "n": 3 }
{
  "o": {
    "raw": "010000000001010010000000010101111110110010",
    "rh": 8.2, "t": 35.1 },
  "n": 3 }
{
  "o": {
    "raw": "010000000001010011000000010101111110110011",
    "rh": 8.3, "t": 35.1 },
  "n": 3 }