#include "DHTesp.h"
#include <WiFi.h>
#include <ThingSpeak.h> 
const int trig = 14;
const int echo = 27;

long duration;
float distance;
#define SECRET_SSID "Wokwi-GUEST"    
#define SECRET_PASS "" 

#define SECRET_CH_ID  3130254  
#define SECRET_CH_IDr 3130254
#define SECRET_WRITE_APIKEY "RK7PIO9A4WJIV81B"   
#define SECRET_READ_APIKEY "X0MMJNCUWTTASN9X"   

char ssid[] = SECRET_SSID;  
char pass[] = SECRET_PASS;   
int keyIndex = 0;            
WiFiClient  client;
unsigned long myChannelNumber = SECRET_CH_ID;
unsigned long readmyChannelNumber = SECRET_CH_IDr;
const char * myWriteAPIKey = SECRET_WRITE_APIKEY;
const char * myReadAPIKey = SECRET_READ_APIKEY;
unsigned int dataFieldOne = 2; 

float aConst = 2.25E-02;
const int DHT_PIN = 15;

DHTesp dhtSensor;

void setup() {
  Serial.begin(115200);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(18, OUTPUT);
  pinMode(5, OUTPUT);
  while (!Serial) {
    ;
  }
  WiFi.mode(WIFI_STA);   
  ThingSpeak.begin(client);  
}

void loop() {
  if(WiFi.status() != WL_CONNECTED)
  {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(SECRET_SSID);
    while(WiFi.status() != WL_CONNECTED)
    {
      WiFi.begin(ssid, pass); 
      Serial.print(".");
      delay(5000);     
    } 
    Serial.println("\nConnected.");
  }
  int statusCode;
  //DHT11
  TempAndHumidity  data = dhtSensor.getTempAndHumidity();
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Humidity: " + String(data.humidity, 1) + "%");
  //Ultrasonic
  digitalWrite(trig,LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);

  duration = pulseIn(echo, HIGH);
  //Serial.println(duration);
  distance = duration*0.034/2;
  Serial.println(distance);
  Serial.println("---");

  //Thingspeak

  ThingSpeak.setField(1,data.humidity);
  ThingSpeak.setField(2, data.temperature);
  ThingSpeak.setField(3, distance);
  statusCode = ThingSpeak.writeFields(myChannelNumber,SECRET_WRITE_APIKEY);

  aConst = readTSData( readmyChannelNumber, dataFieldOne );
  Serial.println(aConst);
  if(aConst == 1){
    digitalWrite(5, HIGH);
    Serial.println("Relay on");
  }
  else{
    digitalWrite(5,LOW);
    Serial.println("Relay off");
  }

  if(statusCode == 200) { //successful writing code
      Serial.println("Channel update successful.");
  }
  else {
      Serial.println("Problem Writing data. HTTP error code :" + String(statusCode));
  }
  delay(15000); // data to be uploaded every 15secs 
 
  
}

float readTSData( long TSChannel, unsigned int TSField ) {

  float data =  ThingSpeak.readFloatField( TSChannel, TSField, SECRET_READ_APIKEY );
  Serial.println( " Data read from ThingSpeak: " + String( data, 9 ) );
  return data;

}