[SOLVED] Can anyone verify that HTU21D module is not buggy?

Your code adapted to pico, runs well on my pico.

// htu21d_00.js
// pico
// left 1:gnd, 2:vbat, 3:3v3, 4:b3

//I2C1.setup({scl:5,sda:4});
//pico left 7: B6, left 8: B7 //I2C1
//pico left 4: B3, right 5: B10 //I2C2
//propeller sda: P29, scl: P28



setBusyIndicator(LED1);

var i2c = new I2C();
//i2c.setup({scl: D17, sda: D19});//NRF52
i2c.setup( {scl: B6, sda: B7 } ); // pico soft i2c
var htu = require('HTU21D').connect( i2c );
var temperature;
var humidity;
function HTU21DRead() {
  htu.getTemperature( function(temp) {
    htu.getHumidity( function(hum) {
      temperature = temp;
      humidity = hum;
      console.log('tmp : ' + temperature);
      console.log('hum : ' + humidity);
    });
  } );
}
setInterval("HTU21DRead()",1000);

And output.

>
 _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v95 Copyright 2017 G.Williams
>
=undefined
tmp : 21.08276855468
hum : 35.24450683593
tmp : 21.08276855468
hum : 35.22161865234
tmp : 21.08276855468
hum : 35.23687744140
tmp : 21.08276855468
hum : 35.25213623046
tmp : 21.08276855468
hum : 35.259765625
tmp : 21.09349365234
hum : 35.28265380859
tmp : 21.08276855468
hum : 35.28265380859
tmp : 21.09349365234
hum : 35.28265380859
>reset();
=undefined
 _____                 _
|   __|___ ___ ___ _ _|_|___ ___
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v95 Copyright 2017 G.Williams
>