/*	Lab Test Jul 2024
	 *	Name:	CHIA HOOI BOOY
   * Class:DEEC2
	 *	Date:17-July-2024
	*/ 

#include <WiFi.h>
#include <PubSubClient.h>

#define ADC_IN A5
#define ADC_REF 3.3


char led_green = 18;
char led_green_state = LOW;

long led_green_previous_millis = 0;
int led_green_interval = 1500;

long ADC_previous_millis = 0;
int ADC_interval = 2500;
int ADC_value;

const char* ssid = "Wokwi-GUEST";
const char* password = "";

WiFiClient espClient;
PubSubClient client(espClient);

const char* hostname = "broker.hivemq.com";
const char* espClientName = "maymaychia"; // yourStudentID must be unique
int PORTNUM = 1883;

void setup_wifi() 
{
  WiFi.begin(ssid, password);
  while(WiFi.status() != WL_CONNECTED )
  {
    delay(1000);
    Serial.print(".");
  }
  Serial.println();
  Serial.print("Connected to ");
  Serial.println(ssid);
  Serial.print("Given IP by the router to ESP32 is ");
  Serial.println(WiFi.localIP());
} 

void connectMQTT()
{
  while(!client.connected() )
  {
    Serial.println("Connecting to MQTT ...");
    if (client.connect(espClientName) ) //, mqttUser, mqttPassword) )
    {
      Serial.print("Failed with state ");
      Serial.print(client.state() );
      delay(5000);
    }
  }
}

void setup_MQTT() 
{
  client.setServer(hostname, PORTNUM);
}


void setup()
{ 
 pinMode(led_green, OUTPUT);
  Serial.begin(9600);
  delay(5000);

  setup_wifi();
  setup_MQTT();
}

void loop() 
{
  if ( !client.connected() )
  {
    connectMQTT();
  }

   client.loop();

   long current_millis = millis();
   if (current_millis - led_green_previous_millis >= led_green_interval)
  {
   led_green_previous_millis = current_millis;

   if(led_green_state == LOW)
    led_green_state =HIGH;   
    

   else
    led_green_state = LOW;
     
   digitalWrite(led_green, led_green_state);
  }
   if (current_millis - ADC_previous_millis >= ADC_interval)
  {
   ADC_previous_millis = current_millis;
   ADC_value = analogRead(ADC_value); //I use A5 (pin 33)

//Print output of ADC to Serial Monitor
  Serial.print("ADC value = "); Serial.println(ADC_value);

  int adcRes = analogRead(A5);
   char str[4];
   sprintf(str, "%d", adcRes);
   client.publish("IOT/3840032A/red",str);
  
  }
 if (ADC_value <= 1000)
 {

 digitalWrite(led_green, LOW);
 }
 else if ( (ADC_value > 2500) && (ADC_value < 3500) ) 
 {
 digitalWrite(led_green,HIGH);

 }

}