Arduino with a DHT11 and RGB LED which changes colour based on temperature - prints temperature and humidity to PLX-DAQ Excel spreedsheet and serial monitor

Code gets:

- Temperature and Humidity from a DHT11 sensor

and

 RGB LED changes colour depending on the Temperature

Prints the data to the Serial Monitor

Data is sent to an Excel spreadsheet through data acquisition software, PLX-DAQ, Download here

Please let me know if you experience any problems with this code. Be sure to check back for more Arduino code.

Schematic:

Code:

 /*  
   
 Oliver Holden  
 Created 28/10/2014  
   
 Components:  
 * Arduino UNO  
 * DHT11  
 * 4.7K resistor  
 * RGB LED  
 * 3x 220 ohm resistors  
   
 - Gets Temperature and Humidity from a DHT11 sensor  
   
 - RGB LED changes colour depending on the Temperature   
   
 Prints the data to the Serial Monitor  
   
 Data is sent to an Excel spreadsheet through data   
 acquisition software, PLX-DAQ, Download http://www.parallax.com/downloads/plx-daq  
   
 Schematic for this project is on  
 http://breadboarder.blogspot.co.uk/  
   
 */  
   
 #include <dht.h>   // Including libary to read DHT11   
    
 dht DHT;   // Need this   
   
 int x = 0;   // For PLX-DAQ  
 int row = 0;   // For PLX-DAQ  
   
 int redPin = 11;   // Red LED,  connected to digital pin 11  
 int grnPin = 10;  // Green LED, connected to digital pin 10  
 int bluPin = 9;  // Blue LED, connected to digital pin 9  
   
 int dht_dpin = A0;   // DHT11 data pin attached to A2   
    
 void setup(){     
    
  Serial.begin(9600);   // Opening serial connection at 9600bps   
  Serial.println("Humidity and temperature");   // Printing Serial Monitor header  
  Serial.println("LABEL, Time, T (C)");   // Setting headers of colums in PLX-DAQ spreadsheet  
  delay(1000);   // Wait 1 second before printing data to Serial Monitor  
    
  pinMode(redPin, OUTPUT);   // Sets the pins as output for RGB LED  
  pinMode(grnPin, OUTPUT);  
  pinMode(bluPin, OUTPUT);  
    
  }  
    
 void loop(){     
    
  DHT.read11(dht_dpin);   // Reading data from DHT11  
    
   Serial.print("Current humidity = ");   // Printing text  
    
   Serial.print(DHT.humidity);     
   Serial.print("% ");     
   Serial.print("temperature = ");     
   Serial.print(DHT.temperature);     
   Serial.println("C ");     
    
  // Setting the colours of the RGB LED based on temperature,  
 // Colour is shown for 0.1s before checking temperature again.  
   
 if((DHT.temperature < 26) && (DHT.temperature >= 23.2))   // Writing the LED colour pins HIGH or LOW to set colours  
  {  
   digitalWrite(redPin, HIGH);  // yellow  
   digitalWrite(grnPin, HIGH);  
   delay(100);  
     
   digitalWrite(bluPin, LOW);  
   
  }  
    
  if((DHT.temperature < 23) && (DHT.temperature > 20.2))  
  {  
   digitalWrite(grnPin, HIGH);  // green  
   delay(100);  
     
   digitalWrite(redPin, LOW);  
   digitalWrite(bluPin, LOW);  
    
  }  
   
 if((DHT.temperature < 20) && (DHT.temperature > 17.2))  
  {  
   digitalWrite(grnPin, HIGH);  // aqua  
   digitalWrite(bluPin, HIGH);  
   delay(100);  
     
   digitalWrite(redPin, LOW);  
     
   
  }  
   
  if(DHT.temperature <= 17)  
  {  
   digitalWrite(bluPin, HIGH);  // blue  
   delay(100);  
     
   digitalWrite(grnPin, LOW);  
   digitalWrite(redPin, LOW);  
    
  }  
    
 row++;   // For PLX-DAQ  
 x++;   // For PLX-DAQ  
    
  delay(1000);   // Sensor shouldn't be read too frequently so delay of 1s  
    
  }