Smart ventilator example

Coming soon

The following is the code for the controller with relay module. Required libraries:

lib_deps = ITTIoT

/*
* Ventilator example - relay shield program
*
* This program is for the controller with relay shield. It is meant to work together with
* the Ventilator - DHT shield program.
* The controller subscribes to topics "temp" and "conf". The "temp" topic is meant for temperature data.
* If the received temperature is higher then tempLimit (default 28 degrees) it will switch on the relay.
* If the temperature goes under the limit again, the relay is switched off.
* For changing the tempLimit, send new limit to topic "conf" (for example: "26.3").
*
* Author: Rim Puks
* May 2018
*/
 
#include <Arduino.h>
#include <ittiot.h>
 
#define RELAY_PIN 5
float t; //for holding the received float value
float tempLimit = 28; //the temperature limit on what the relay will switch
 
void iot_received(String topic, String msg)
{
  Serial.print("MSG FROM USER callback, topic: ");
  Serial.print(topic);
  Serial.print(" payload: ");
  Serial.println(msg);
  t=msg.toFloat();
 
  if(topic=="DHT/conf")
  {
    tempLimit=t; //re-configures the limit temperature
  }
 
  if(topic=="DHT/temp")
  {
    if(t >= tempLimit)
    {
      digitalWrite(RELAY_PIN, HIGH);
    }
    else
    {
      digitalWrite(RELAY_PIN, LOW);
    }
  }
}
 
void iot_connected()
{
  Serial.println("MQTT connected callback");
  iot.subscribe("temp");
  iot.subscribe("conf");
  iot.log("Ventilator example!");
}
 
void setup()
{
  Serial.begin(115200);
  Serial.println("Booting");
 
  iot.printConfig(); // print json config to serial //Peale Serial.begin ja enne iot.setup
  iot.setup();
  pinMode(RELAY_PIN, OUTPUT);
}
 
void loop()
{
  iot.handle();
  delay(200);
}

The following is the program code for the controller with DHT module. Required libraries: