Temperature and humidity sensor

1// include the library code:
2#include <LiquidCrystal.h>
3#include  "DHT.h"
4
5// set the DHT Pin
6#define DHTPIN 8
7
8// initialize the  library with the numbers of the interface pins
9LiquidCrystal lcd(12, 11, 5, 4,  3, 2);
10#define DHTTYPE DHT11
11DHT dht(DHTPIN, DHTTYPE);
12
13void setup()  {
14  // set up the LCD's number of columns and rows: 
15  lcd.begin(16, 2);
16  dht.begin();
17  
18  // Print a message to the LCD.
19  lcd.print("Temp:  Humidity:");
20}
21
22void loop() {
23  delay(500);
24  // set the cursor  to column 0, line 1
25  // (note: line 1 is the second row, since counting begins  with 0):
26  lcd.setCursor(0, 1);
27  // read humidity
28  float h = dht.readHumidity();
29  //read temperature in Fahrenheit
30  float f = dht.readTemperature(true);
31
32  if (isnan(h) || isnan(f)) {
33    lcd.print("ERROR");
34    return;
35  }
36
37  lcd.print(f);
38  lcd.setCursor(7,1);
39  lcd.print(h);  
40}
41