Hi,
I want to control a relay using the humidity sensor. Everything works fine, the relay turns on when the humidity is below 60% and turns off when it is above 70%.
The problem is that the code doesn't resume itself unless the relay is off. Let's say I turn my Arduino on. It'll make the initial reading, display it on the screen. If the humidity level is below 60%, then it'll be stuck on those values until the humidity reaches 70%. I hope I make sense. I want the temperature and humidity to be checked every and displayed every 2 seconds regardless of the state of the relay. How do I do that? Thanks. I've added my code. Feel free to edit it to make it more efficient.
// DHT sensor library - Version: Latest
#include <DHT.h>
#include <DHT_U.h>
#include <LiquidCrystal.h>
#define DHTPIN 12 // what pin we're connected to
#define DHTTYPE DHT11 // DHT 11
DHT dht(DHTPIN, DHTTYPE);
//Declaring the lcd pins
LiquidCrystal lcd(8, 9, 4, 5, 6, 7);
//variables
int check;
float hum; //Stores humidity value
float temp; //Stores temperature value
void setup() {
// Don't forget to choose 9600 at the port screen
pinMode(11,OUTPUT);
digitalWrite(11,HIGH);
//Telling our lcd to start up
lcd.begin(16, 2);
lcd.clear();
lcd.setCursor(4,0);
lcd.print("Reading");
lcd.setCursor(2,1);
lcd.print("DHT11 Sensor");
delay(2000);
}
void loop() {
//These serial codes are for getting readings on the port screen aswell as the LCD display, since they'll offer us a more detailed interface
//Read DHT11 data and store it to variables hum and temp
hum = dht.readHumidity();
temp = dht.readTemperature();
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Temp: ");
lcd.print(temp);
lcd.print(" ");
lcd.print((char)223);
lcd.print("C");
lcd.setCursor(0,1);
lcd.print("Hum: ");
lcd.print(hum);
lcd.print(" %");
if (hum < 60){
while(hum < 75){
digitalWrite(11,HIGH); //high means on. if the humidity is below 60, the relay will turn on.
delay(2000);
}
}
else if (hum > 70){
digitalWrite(11,LOW);//low means off. if the humidity is above 70, the relay will turn off.
delay(2000); //Delay 2 sec.
}
}
