'dht' does not name a type

Question

I'm running this code and it keeps giving me this error. Below I'm putting the code. It's a weather station arduino code. I already added and imported the libraries but I keep getting the same error.

#include <stdlib.h>
#include <SoftwareSerial.h>
#include <DHT.h>
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP085_U.h>
#define SSID "DroidSpot" //replace XXXXX by your router SSID
#define PASS "gggg" //replace YYYYY by your router password
#define IP "184.106.153.149" // thingspeak.com IP
#define DHT22_PIN 2
String GET = "GET /update?key=GDQ0LAAXLDGYMXW1&field1="; //replace ZZZZZ by your ThingSpeak channel write key
SoftwareSerial monitor(10, 11); //Serial communication to ESP8266 module (RX, TX)


dht DHT;
Adafruit_BMP085_Unified bmp = Adafruit_BMP085_Unified(10085);

.....
    
    //read other sensors
    char buffer[10];
    //light sensor
    float luminance = analogRead(luminancePin);
    //UV sensor
    float uv = analogRead(uvPin);
    uv = uv * 0.0049; //convert values to volts
    uv = uv * 307; //convert to mW/m²
    uv = uv/200; //calculate UV index
    //temperature and humidity
    int chk = DHT.read22(DHT22_PIN);
    float humidity = DHT.humidity;
    float temperature = DHT.temperature;
    //pressure and temperature1
    sensors_event_t event;
    bmp.getEvent(&event);
    float pressure = 0;
    float temperature1 = 0;
    if (event.pressure)
    {
      pressure = event.pressure;
      bmp.getTemperature(&temperature1);
    }

The error is in the dht DHT; line. It is:

'dht' does not name a type

Answer 1

Check which library you are using. You might be trying to combine two different source code examples using two different libraries.

---

The body of your code seems to suggest you want a different library. This library defines the type you want: https://github.com/RobTillaart/DHTstable with the appropriate fields as Juraj has pointed out.

You'll have to change your header(s) as well, as here . Especially:

#include <dht.h>

---

If you do intend to use the Adafruit library, as your includes seem to suggest:

• As the error says, there's no class or type definition for dht . The class name is DHT , not dht .

  See DHT.h in the Github repo, and this example in the same repo.

Switch the tokens around:

DHT dht;

and refactor all other DHT to dht . You'll also need to make sure you're calling the right class method, as read22 is not defined in this library.