Using a Digital Logger IoT Relay to control humidity/temperature

Projects General Guidance
1

Hello,

I have a Digital Loggers IoT Relay
(http://www.digital-loggers.com/iot.html) and I'm trying to use it to turn on a humidifier when the humidity drops below a certain level. I've got the LCD screen and DHT11 set up and working properly but I'm struggling to add the IoT relay in to it. Here is my code.

 #include <dht.h>
#include <LiquidCrystal.h>

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

dht DHT;

#define DHT11_PIN 7
//int iotRelay= 9;                 // LED connected to digital pin 13

void setup()
{
   lcd.begin(16, 2);
//  pinMode(iotRelay, OUTPUT);      // sets the digital pin as output
}

void loop()
{

  int chk = DHT.read11(DHT11_PIN);
  lcd.setCursor(0,0); 
  lcd.print("Temp: ");
  lcd.print(DHT.temperature);
  lcd.setCursor(0,1);
  lcd.print("Humidity: ");
  lcd.print(DHT.humidity);
  lcd.print("%");
  delay(1000);
  
}

I've watched the tutorial Digital Loggers did and I can make the relay work for the Blink arduino project, but I can't figure out how to connect it and code it to work with my project. Any ideas are welcomed, thank you so much.

2

I've had a quick look at those IOT not really looked at the data sheet for it, but what from I can make out you just send an high signal to turn it on/off. It just looks like there switching a relay on/off along with a breaker for protection, you could make your own quite simple.
This may help you, just a bit of simple code change the humidity variable to what your DHT sensor variable is then set min and max of it, It just some simple code thrown together and complies but un-tested, well I say untested I used something very similar to control a fish tank heater but just changed the variables

const int IOT = 5; // set pin 5 as the output
float Min_humidity   = 20.00; //min humidity  
float Max_humidity   = 35.00; //Max humidity  
float  humidity; // your DHT sensor
void setup() {
  pinMode(IOT, OUTPUT);

}

void loop() {
  
  if (humidity <  Min_humidity) { // if humidity is less than DHT reading turn IOT on 
    digitalWrite(humidity, HIGH);
  }
  if (humidity >= Max_humidity) { // if humidity is less than DHT reading turn IOT off 
    digitalWrite(humidity, LOW);
  }

}