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  • Author Author: jeepingoody
  • Date Created: Date Created
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First Arduino Project

jeepingoody

Completed my first project with the Arduino.

 

Display the temp and humidity from a DHT11 sensor on an LCD

 

Took me all day but finally got it done. Code is as follows

 

 

 

 

// display temp and humidity on LCD


#include <SimpleDHT.h>
#include<LiquidCrystal.h>
LiquidCrystal lcd (4,5,6,7,8,9); //pins for RS, E, DB4, DB5, DB6, DB7


// for DHT11,
//      VCC: 5V or 3V
//      GND: GND
//      DATA: 2
int sensor = 10; // sensor is on pin 10
SimpleDHT11 dht11;
#define LED 11  // LED is on pin 11


void setup() {
// LCD setup
  lcd.begin(16,2);
  lcd.clear();
  
  pinMode(LED,OUTPUT); // set led to output
}


void loop()
{
  lcd.clear(); // clear LCD
  
  // Sensor Check.
  byte temperature = 0;
  byte humidity = 0;
  if (dht11.read(sensor, &temperature, &humidity, NULL)){ 
  
  // if sensor shows no data let me know
  lcd.setCursor(1,0);
  lcd.print("**************");
  lcd.setCursor(0,1);
  lcd.print("**CHECK SENSOR**.");
  delay(1000);
  digitalWrite(LED,HIGH); // turn on LED if no data found
  return;
  }
  
 // convert c to f

float c = 0;
  float temp = 0;
  c = temperature;
  temp = (1.8 * c) + 32;
  
 // Display data

  digitalWrite(LED,LOW);   // turn LED off
  lcd.clear();


// Display Temp


  
  lcd.setCursor(0,0);
  lcd.print("TEMP ");
  lcd.print(temp,1);
  lcd.print(" F");
  delay(5000);


// Display Humidity


  lcd.clear();
  lcd.setCursor(0,1);
  lcd.print("Humidity ");
  lcd.print((int)humidity); 
  lcd.print("%");
  delay(5000);
}

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