code error

Other Hardware Home Automation
1

I am working on automating a humidifier from the arduino projects site. The code given seems to have an error. Can anyone help me fix it? (I'm no good at programming.)

#include <dht.h>

#include <LiquidCrystal.h>

// include the library code:
#include <LiquidCrystal.h>
#include "DHT.h"

// set the DHT Pin
#define DHTPIN 8

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);
#define DHTTYPE DHT11
DHT (DHTPIN, DHTTYPE);

void setup() {
  // set up the LCD's number of columns and rows: 
  lcd.begin(16, 2);
  dht.begin();
  
  // Print a message to the LCD.
  lcd.print("Temp:  Humidity:");
}

void loop() {
  delay(500);
  // set the cursor to column 0, line 1
  // (note: line 1 is the second row, since counting begins with 0):
  lcd.setCursor(0, 1);
  // read humidity
  float h = dht.readHumidity();
  //read temperature in Fahrenheit
  float f = dht.readTemperature(true);

  if (isnan(h) || isnan(f)) {
    lcd.print("ERROR");
    return;
  }

  lcd.print(f);
  lcd.setCursor(7,1);
  lcd.print(h);  
}

sketch_aug26b:15: error: expected constructor, destructor, or type conversion before '(' token

DHT (DHTPIN, DHTTYPE);

^

C:\Users\user\Documents\Arduino\sketch_aug26b\sketch_aug26b.ino: In function 'void setup()':

sketch_aug26b:20: error: expected unqualified-id before '.' token

dht.begin();

^

C:\Users\user\Documents\Arduino\sketch_aug26b\sketch_aug26b.ino: In function 'void loop()':

sketch_aug26b:32: error: expected primary-expression before '.' token

float h = dht.readHumidity();

^

sketch_aug26b:34: error: expected primary-expression before '.' token

float f = dht.readTemperature(true);

^

Using library DHTLib in folder: C:\Users\user\Documents\Arduino\libraries\DHTLib (legacy)
Using library LiquidCrystal at version 1.0.5 in folder: C:\Users\user\Downloads\arduino-1.6.10-windows (1)\arduino-1.6.10\libraries\LiquidCrystal
exit status 1
expected constructor, destructor, or type conversion before '(' token

2

You run the DHT () function out of the main functions (setup or loop). That is not allowed. Put it in the setup instead.

3

Please post a link to where you downloaded the DHTlib library.

Thanks for using code tags for your sketch! Please also do so when you post error/warning messages or other console output on the forum. This will ensure that it is properly formatted and make it easy for us to read.

4

shelbykate19:

DHT (DHTPIN, DHTTYPE);

This is wrong: you've written it as if it were a function. It's not, it's a class. You need to create an instance of that class:

DHT dht(DHTPIN, DHTTYPE);