💬 Air Humidity Sensor - DHT

[Oli]

Could someone explain me why "Must be >1000ms for DHT22 and >2000ms for DHT11" when sampling rate is once per sec for DHT11 (once per 1000ms) and twice per sec for DHT22 (once per 500ms)?

[Amput]

In Wiring Things Up and screen are used DATA_PIN 3, but in example is wrote #define DHT_DATA_PIN 2 :-) ...please correct it.

[hek]

@Amput,

Thanks, updated.

[skywatch]

@hek

No it is not fixed!

[ramoncarranza]

@hek how do I change fro C to F?

[mfalkvidd]

@hek I think @skywatch meant that the text is updated, but not the picture. The picture is still using pin 3.

[mfalkvidd]

@ramoncarranza set your controller to use non-metric.

[hek]

Yes, didn't see that one @mfalkvidd. Hmm.. Not sure I have the source photoshop psd available any more.

[mfalkvidd]

@hek you mean you delete files? :fearful:

[hek]

Ha, probably not, just a matter of find it. :sweat:

[skywatch]

What @Skywatch meant was that "#define DHT_DATA_PIN 2" is STILL in the example code on this page. Anyone who even gets as far as working it all out and wiring it all up and it still it won't work like that! - Not when it needs to be connected to PIN 3 instead (esp if the NRF is using pin 2, which is likely).
Happy New Year to you all! :)

[Efflon]

Just a note, tried following this for adding a DHT11 to the ESP8266 MQTT gateway. The MySensors example lib does not work with esp8266 (temperatures around 17000+). However the adafruit DHT library 1.3.0 works just fine.Any reason that couldn't be used here?

[hek]

Nope. Most of the examples were only verified using Atmega. If you find a better lib working on both platforms, please create a pull request including the updated example and library.

[Efflon]

Ok! I just have to verify it on Atmega first. I'll be back..

[MLs]

DHT sketch version 2.1.0 no data i IDE seiel

And if i use DHT example sketch then I get data temp / hum

Did not have permission to post in the forum

[flopp]

@hek @mfalkvidd I read that you discussed about PIN 2 and 3.

Code say PIN 2, Wiring things up say PIN 2 and picture shows PIN 3.

It can't use PIN 2 or can it, PIN 2 is used by the radio, or am I to tired :)?

[meanmrgreen]

@flopp

thats the irq pin in the radio post.
Not used by the radio

[flopp]

@meanmrgreen said:

@flopp

thats the irq pin in the radio post.
Not used by the radio

I must have missed something or forgot. Is PIN 2 only used on Gateways?
Is it different between MyS version 1.x and 2.x?

[hek]

Tried to follow the history on the humidity file back in time on github.
At some point (2.0 release) the example was switched from HumiditySensor.ino (using pin 3) to DhtTemperatureAndHumiditySensor.ino (pin 2) created by @mozzbozz.

Not sure why the pin was switched, but you can run without the radio/IRQ-pin connection as long as not activating the MY_RX_MESSAGE_BUFFER_FEATURE.

[flopp]

@hek
All other examples are using PIN 3. Wouldn't it be easier to use PIN 3 for all examples? Maybe we shall wait and see if mozzbozz know why he changed to PIN 2.