You are using two different DHT libraries!
I have added the relay driver code to the LCD example. I have not tried it as I am not sure which libraries you have been using!
/*-----( Import needed libraries )-----*/
#include <dht11.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
/*-----( Declare objects )-----*/
// set the LCD address to 0x27 for a 20 chars 4 line display
// Set the pins on the I2C chip used for LCD connections:
// addr, en,rw,rs,d4,d5,d6,d7,bl,blpol
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // Set the LCD I2C address
dht11 DHT11;
#define CH1 8 //<<<<
#define CH2 9 //<<<<
/*-----( Declare Constants, Pin Numbers )-----*/
#define DHT11PIN 2
void setup() /*----( SETUP: RUNS ONCE )----*/
{
pinMode(CH1, OUTPUT); //<<<<
pinMode(CH2, OUTPUT); //<<<<
Serial.begin(9600); //(Remove all 'Serial' commands if not needed)
lcd.begin(20,4); // initialize the lcd for 20 chars 4 lines, turn on backlight
lcd.backlight();
// Print a message to the LCD.
//lcd.setCursor(0, 1);
lcd.print("Temp en lucht");
}/*--(end setup )---*/
void loop() /*----( LOOP: RUNS CONSTANTLY )----*/
{
int chk = DHT11.read(DHT11PIN);
Serial.print("Read sensor: ");
switch (chk)
{
case 0: Serial.println("OK"); break;
case -1: Serial.println("Checksum error"); break;
case -2: Serial.println("Time out error"); break;
default: Serial.println("Unknown error"); break;
}
lcd.setCursor(0, 1);
lcd.print("C=");
lcd.print((float)DHT11.temperature, 0);
Serial.print("Temperature (oC): ");
Serial.println((float)DHT11.temperature, 2);
lcd.print(" F=");
lcd.print(Fahrenheit(DHT11.temperature), 0);
Serial.print("Temperature (oF): ");
Serial.println(Fahrenheit(DHT11.temperature), 2);
lcd.print(" H=");
lcd.print((float)DHT11.humidity, 0);
lcd.print("%");
Serial.print("Humidity (%): ");
Serial.println((float)DHT11.humidity, 2);
Serial.print("Temperature (K): ");
Serial.println(Kelvin(DHT11.temperature), 2);
Serial.print("Dew Point (oC): ");
Serial.println(dewPoint(DHT11.temperature, DHT11.humidity));
Serial.print("Dew PointFast (oC): ");
Serial.println(dewPointFast(DHT11.temperature, DHT11.humidity));
// Added these lines
if (DHT11.temperature < 30)
digitalWrite(CH1, HIGH); // If so, turn on the relay.
else
digitalWrite(CH1, LOW); // Otherwise, turn the relay off.
delay(2000);
if (DHT11.temperature > 30)
digitalWrite(CH1, LOW); // If so, turn on the relay.
else
digitalWrite(CH1, HIGH); // Otherwise, turn the relay off.
if (DHT11.humidity > 70)
digitalWrite(CH2, LOW); // If so, turn on the relay.
else
digitalWrite(CH2, HIGH); // Otherwise, turn the relay off.
delay(2000);
if (DHT11.humidity < 70)
digitalWrite(CH2, HIGH); // If so, turn on the relay.
else
digitalWrite(CH2, LOW); // Otherwise, turn the relay off.
}/* --(end main loop )-- */
/*-----( Declare User-written Functions )-----*/
//
//Celsius to Fahrenheit conversion
double Fahrenheit(double celsius)
{
return 1.8 * celsius + 32;
}
//Celsius to Kelvin conversion
double Kelvin(double celsius)
{
return celsius + 273.15;
}
// dewPoint function NOAA
// reference: http://wahiduddin.net/calc/density_algorithms.htm
double dewPoint(double celsius, double humidity)
{
double A0= 373.15/(273.15 + celsius);
double SUM = -7.90298 * (A0-1);
SUM += 5.02808 * log10(A0);
SUM += -1.3816e-7 * (pow(10, (11.344*(1-1/A0)))-1) ;
SUM += 8.1328e-3 * (pow(10,(-3.49149*(A0-1)))-1) ;
SUM += log10(1013.246);
double VP = pow(10, SUM-3) * humidity;
double T = log(VP/0.61078); // temp var
return (241.88 * T) / (17.558-T);
}
// delta max = 0.6544 wrt dewPoint()
// 5x faster than dewPoint()
// reference: http://en.wikipedia.org/wiki/Dew_point
double dewPointFast(double celsius, double humidity)
{
double a = 17.271;
double b = 237.7;
double temp = (a * celsius) / (b + celsius) + log(humidity/100);
double Td = (b * temp) / (a - temp);
return Td;
}
Is it LCD 16x2 with I2C?
