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

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•

Jean-Philippe_Rey
Dear all,

I just tried the module HTU21D (http://www.espruino.com/HTU21D) and it seems that I can get the temperature quite accurately but the humidity ever returns -6.
I figured out that the HTU21D may be compatible with the Sensiron SHT21. I tried to used the module SHT2xinstead. As before, temperature is correctly read but humidity returns null.
Did anyone use this/those modules recently and can confirm they work as expected?

Thank you!

my code:
```
var i2c = new I2C();
i2c.setup({scl: D17, sda: D19});//NRF52
var htu = require('HTU21D').connect( i2c );

var temperature;
var humidity;
function HTU21DRead() {
  htu.getTemperature( function(temp) {
    htu.getHumidity( function(hum) {
      temperature = temp;
      humidity = hum;
    });
  } );
}

setInterval("HTU21DRead()",1000);
```
And when I ask for temperature and humidity I get:
```
>temperature
=23.62461669921
>humidity
=-6
```

•

user122043 in reply to @Jean-Philippe_Rey

Hi Jean

I had the semi-same problem with HTU21D. It returned with open circuit humidity and temperature a lot of times. After it worked again (or not :)).
The I2C line uses 3 eeproms which work fine all time...
I reviewed my code.. the library...the eeprom... bus frequency...datasheet... my 4 htu sensors, everything... the fault and instability stayed the same.

The final solution was: I used 1K resistors to pull up the bus lines because of 4 devices on it. This was the mistake. with 0.5K it also did not worked, but with 2.7K all of my sensors became available immediately.

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