Check the DHT library for what you are meant to include.
how could I check that? I am sorry for asking but I am a beginner at this.
what do you mean "nothing happens"?
does your LCD display anything?
i don't see and DHT related function calls
and please edit you're original post using the <code> icon to paste your code in the highlight area rather than posting a screen shot image
My Lcd does not display anything because the code has an error. And here is a copy of the code I used.
#include <dht.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
dht DHT;
#define DHT11_PIN 7
void setup(){
lcd.begin(16, 2);
}
void loop(){
int chk = DHT.read11(DHT11_PIN);
lcd.setCursor(0,0);
lcd.print("Temp: ");
lcd.print(DHT.temperature);
lcd.print((char)223);
lcd.print("C");
lcd.setCursor(0,1);
lcd.print("Humidity: ");
lcd.print(DHT.humidity);
lcd.print("%");
delay(1000);
}
In the Examples tab of the drop down menu File, look for DHT tab and there should be your examples for the library.
can you copy&paste the error just like you did the code (good job!)
Arduino: 1.8.9 (Windows 10), Board: "Arduino/Genuino Uno"
sketch_jun24a:1:17: error: dht.h: No such file or directory
compilation terminated.
exit status 1
dht.h: No such file or directory
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
but if you just want to see that the LCD is working, comment out that line for now
In the dht sensor library there were two more options shich one should I pick? dht_unified_sensor or dhttester
Give this one a try.
How should I do that? Please tell me what should I do, I've been trying for this to work an I only have one more day to finish this.
This was inside the dhttester
// Example testing sketch for various DHT humidity/temperature sensors
// Written by ladyada, public domain
// REQUIRES the following Arduino libraries:
// - DHT Sensor Library: https://github.com/adafruit/DHT-sensor-library
// - Adafruit Unified Sensor Lib: https://github.com/adafruit/Adafruit_Sensor
#include "DHT.h"
#define DHTPIN 2 // Digital pin connected to the DHT sensor
// Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
// Pin 15 can work but DHT must be disconnected during program upload.
// Uncomment whatever type you're using!
//#define DHTTYPE DHT11 // DHT 11
#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
// Connect pin 1 (on the left) of the sensor to +5V
// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
// to 3.3V instead of 5V!
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 3 (on the right) of the sensor to GROUND (if your sensor has 3 pins)
// Connect pin 4 (on the right) of the sensor to GROUND and leave the pin 3 EMPTY (if your sensor has 4 pins)
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor
// Initialize DHT sensor.
// Note that older versions of this library took an optional third parameter to
// tweak the timings for faster processors. This parameter is no longer needed
// as the current DHT reading algorithm adjusts itself to work on faster procs.
DHT dht(DHTPIN, DHTTYPE);
void setup() {
Serial.begin(9600);
Serial.println(F("DHTxx test!"));
dht.begin();
}
void loop() {
// Wait a few seconds between measurements.
delay(2000);
// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);
// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println(F("Failed to read from DHT sensor!"));
return;
}
// Compute heat index in Fahrenheit (the default)
float hif = dht.computeHeatIndex(f, h);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);
Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% Temperature: "));
Serial.print(t);
Serial.print(F("°C "));
Serial.print(f);
Serial.print(F("°F Heat index: "));
Serial.print(hic);
Serial.print(F("°C "));
Serial.print(hif);
Serial.println(F("°F"));
}
Also when I tried verifying this code this error messaged appeared
Arduino: 1.8.9 (Windows 10), Board: "Arduino/Genuino Uno"
In file included from C:\Users\Admin\OneDrive\Documents\Arduino\libraries\DHT_sensor_library\DHT_U.cpp:15:0:
C:\Users\Admin\OneDrive\Documents\Arduino\libraries\DHT_sensor_library\DHT_U.h:36:29: fatal error: Adafruit_Sensor.h: No such file or directory
compilation terminated.
exit status 1
Error compiling for board Arduino/Genuino Uno.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
Change this into #include <DHT.h>.
And perhaps install the Adafruit_Sensor library.
I've done what you said and the error changed to
Arduino: 1.8.9 (Windows 10), Board: "Arduino/Genuino Uno"
In file included from C:\Users\Admin\OneDrive\Documents\Arduino\libraries\DHT_sensor_library\DHT_U.cpp:15:0:
C:\Users\Admin\OneDrive\Documents\Arduino\libraries\DHT_sensor_library\DHT_U.h:36:29: fatal error: Adafruit_Sensor.h: No such file or directory
compilation terminated.
exit status 1
Error compiling for board Arduino/Genuino Uno.
This report would have more information with
"Show verbose output during compilation"
option enabled in File -> Preferences.
Also I've already downloaded that in the library and still it did not changed. Do you think it was because of the version?
No, just looked the libraries are still compatible.
How did you install the libraries?
I have installed the latest version. I also installed it through the library manager. Could I ask how would I know if its compatible?
I looked on github and they still appear to be compatible.
Perhaps search for another library?