# How do I connect the dht11 library for this

**URL:** <https://forum.arduino.cc/t/how-do-i-connect-the-dht11-library-for-this/1329211>\
**Category:** IDE 1.x\
**Created:** [December 5, 2024, 11:21am UTC](https://forum.arduino.cc/t/how-do-i-connect-the-dht11-library-for-this/1329211 "2024-12-05T11:21:58Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![jzy\_xlv](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/jzy_xlv/32/1124255_2.png) [@jzy\_xlv](https://forum.arduino.cc/u/jzy_xlv)\
**Post date:** [December 5, 2024, 11:21am UTC](https://forum.arduino.cc/t/how-do-i-connect-the-dht11-library-for-this/1329211/1 "2024-12-05T11:21:59Z")

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i used chatgpt to make the code

C:\Users\jyd\Documents\Arduino\Dht11\Dht11.ino:1:10: fatal error: dht.h: No such file or directory  
#include \<dht.h\>  
^ ~~~~~~  
compilation terminated.  
exit status 1

Compilation error: dht.h: No such file or directory

```arduino
#include <dht.h>

// Define DHT sensor type and pin
#define DHTPIN 2
#define DHTTYPE DHT11 // Use DHT22 if you have one
DHT dht(DHTPIN, DHTTYPE);

// Define RGB LED pins
#define RED_PIN 9
#define GREEN_PIN 10
#define BLUE_PIN 11

void setup() {
  Serial.begin(9600);
  dht.begin();
  
  pinMode(RED_PIN, OUTPUT);
  pinMode(GREEN_PIN, OUTPUT);
  pinMode(BLUE_PIN, OUTPUT);

  Serial.println("Temperature & Humidity RGB Indicator");
}

void loop() {
  // Read temperature and humidity
  float temperature = dht.readTemperature();
  float humidity = dht.readHumidity();

  // Check if the readings are valid
  if (isnan(temperature) || isnan(humidity)) {
    Serial.println("Failed to read from DHT sensor!");
    return;
  }

  Serial.print("Temperature: ");
  Serial.print(temperature);
  Serial.print(" °C, Humidity: ");
  Serial.print(humidity);
  Serial.println(" %");

  // Determine LED color based on temperature
  if (temperature < 20) {
    setColor(0, 0, 255); // Blue for cool temperatures
  } else if (temperature >= 20 && temperature <= 30) {
    setColor(0, 255, 0); // Green for comfortable temperatures
  } else {
    setColor(255, 0, 0); // Red for high temperatures
  }

  delay(2000); // Wait 2 seconds before next reading
}

// Function to set RGB LED color
void setColor(int red, int green, int blue) {
  analogWrite(RED_PIN, red);
  analogWrite(GREEN_PIN, green);
  analogWrite(BLUE_PIN, blue);
}

```

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<div class="post-metadata">

**Author:** ![ruilviana](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ruilviana/32/722429_2.png) [@ruilviana](https://forum.arduino.cc/u/ruilviana)\
**Post date:** [December 5, 2024, 11:24am UTC](https://forum.arduino.cc/t/how-do-i-connect-the-dht11-library-for-this/1329211/2 "2024-12-05T11:24:58Z")

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Have you installed dht.h library?

in not, read:

[https://docs.arduino.cc/software/ide-v1/tutorials/installing-libraries/](https://docs.arduino.cc/software/ide-v1/tutorials/installing-libraries/)

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<div class="post-metadata">

**Author:** ![UKHeliBob](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/ukhelibob/32/215663_2.png) [@UKHeliBob](https://forum.arduino.cc/u/UKHeliBob)\
**Post date:** [December 5, 2024, 11:26am UTC](https://forum.arduino.cc/t/how-do-i-connect-the-dht11-library-for-this/1329211/3 "2024-12-05T11:26:00Z")

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Have you installed a library for the DHT11 sensor ? If so, which one ?

What does your new friend ChatGPT have to say about the error ?

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<div class="post-metadata">

**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [June 3, 2025, 11:26am UTC](https://forum.arduino.cc/t/how-do-i-connect-the-dht11-library-for-this/1329211/4 "2025-06-03T11:26:38Z")

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