It desn't work with ESP8266

[gosewski]

When compiled for ESP8266, this library functions return some strange readings like:
Temperature: 3080214.00 *C
Humidity: 404527.00 %

[CuriousTech]

Uninitialized variable. In DHT.cpp, line 147. Change...
word data;
to
word data = 0;

[Lucky7Chess]

Did that actually work? Didn't work for me.......

[peterodro]

dears,
i make a trial with DHT11 and DHT22.
it is working only with DHT11, with DHT22 it shows any strange value.
I check connected DHT model with "dht.getModel()".
In both cases it shows model 1 = DHT11.
I try to manualy set for model 2 (dht.setup(2,2) or dht.setup(2, DHT22) ) but it always get any error.
Then I adapt DHT.cpp file, i manualy add line model = DHT22; into "void DHT::readSensor()"
Problem solved.
How to corectly set dht.setup() to make fix model type DHT22?

[CuriousTech]

@peterodro try adding Serial.println(DHT22); and see if it prints a 2.

The latest esp8266 SDK has trouble with uninitialized variables even though it's supposed to set them to zero. The DHT_MODEL_t enum in DHT.h is uninitialized. It should begin with AUTO_DETECT = 0 to get around the bug.

If those 2 var inits don't work, make sure it's not something else like I/O pins or hardware.

[peterodro]

i'm sure about correct connection.
In my project I put a 4pin "connector" in place of DHT, so i just plug in DHT11 and then DHT22 (both have same connection i suppose). DHT11 works ok, DHT22 shows 1.0C and 0.0%.
To be sure that DHTs are OK, i test them before on Arduino UNO board, with examples from IDE.
So HW is 100% ok.
in my program is used dht.setup(2);
So DHT connect into pin2.
I need to somethink like dht.setup(2, DHT22); or dht.setup(2, 2); but it gives error.
what is correct syntax of dht.setup() with exactly selected model?

[CuriousTech]

@peterodro It should be dht.setup(pin, DHT::DHT22); For hardware, if you're powering it at 3.3V you may need a pullup resistor if the signal line is low idle. You can also change the pinMode() in readSensor() to use INPUT_PULLUP instead of INPUT, which is a little easier.

[peterodro]

@CuriousTech
thanks
dht.setup(pin, DHT::DHT22); works

so auto detection not working in this lib, but problem solved without changing lib.

[CuriousTech]

@peterodro It looks like you're probably including 2 different DHT libraries and getting some conflicts. There's another one defining DHT22 as a different value.