// channel id : 2518283
//channel api key : JLRCVUZ6NVU667K8

#include <WiFi.h>
#include "DHTesp.h"
#include "ThingSpeak.h"
#define TRIG_PIN 18 // ESP32 pin GIOP23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN 5 // ESP32 pin GIOP22 connected to Ultrasonic Sensor's ECHO pin

float duration_us, distance_cm;

const int DHT_PIN = 15;
const int LED_PIN = 13;
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";
const int myChannelNumber =2518283 ;
const char* myApiKey = "JLRCVUZ6NVU667K8";
const char* server = "api.thingspeak.com";


DHTesp dhtSensor;
WiFiClient client;

void setup() {
  //set the resolution to 12 bits (0-4096)
  // configure the trigger pin to output mode
  pinMode(TRIG_PIN, OUTPUT);
  // configure the echo pin to input mode
  pinMode(ECHO_PIN, INPUT);
  pinMode(A0,INPUT);
  
  Serial.begin(115200);
  dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
  pinMode(LED_PIN, OUTPUT);
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);
  while (WiFi.status() != WL_CONNECTED){
    delay(1000);
    Serial.println("Wifi not connected");
  }
  Serial.println("Wifi connected !");
  Serial.println("Local IP: " + String(WiFi.localIP()));
  WiFi.mode(WIFI_STA);
  ThingSpeak.begin(client);
}

void loop() {
  // generate 10-microsecond pulse to TRIG pin
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
 
  // measure duration of pulse from ECHO pin
  duration_us = pulseIn(ECHO_PIN, HIGH);
  
  // calculate the distance
  distance_cm = 0.017 * duration_us;
  
  int volt = analogRead(A0);
  int voltage =235.6;
  TempAndHumidity data = dhtSensor.getTempAndHumidity();
  ThingSpeak.setField(1,data.temperature);
  ThingSpeak.setField(2,data.humidity);
  ThingSpeak.setField(3,voltage);
  ThingSpeak.setField(5,distance_cm);
  if (data.temperature > 50 || distance_cm < 300 ) {
    digitalWrite(LED_PIN, HIGH);
  }else{
    digitalWrite(LED_PIN, LOW);
  }
  
  int x = ThingSpeak.writeFields(myChannelNumber,myApiKey);
  
  Serial.println("Temp: " + String(data.temperature, 2) + "°C");
  Serial.println("Current: " + String(data.humidity, 1) + "A");
  Serial.println("Voltage: " + String(voltage)+ "V");
  // print the value to Serial Monitor
  Serial.println("Oil level: " + String(distance_cm, 1) + "cm");
  
  if(x == 200){
    Serial.println("Data pushed successfull");
  }else{
    Serial.println();
  }
  Serial.println("---");

  delay(1000);
}