#include <OneWire.h>
#include <DallasTemperature.h>
#include <WiFi.h>
#include "ThingSpeak.h"

// Data wire is connected to GPIO4
#define ONE_WIRE_BUS 12

// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(ONE_WIRE_BUS);

// Pass oneWire reference to DallasTemperature library
DallasTemperature sensors(&oneWire);

// Pins for the ultrasonic sensor
#define TRIG_PIN 16
#define ECHO_PIN 17

// WiFi credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

String tbHost = "eu.thingsboard.cloud";
String tbToken = "YWHnVX5FWShNdQkhcDYM";

// ThingSpeak settings
unsigned long myChannelNumber = 2833377;
const char * myWriteAPIKey = "259L28IZVYJZV47E";

WiFiClient client;

void setup() {
  // Start serial communication
  Serial.begin(115200);

  // Start the DS18B20 sensor
  sensors.begin();

  // Initialize the ultrasonic sensor pins
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  // Connect to WiFi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Initialize ThingSpeak
  ThingSpeak.begin(client);
}

void loop() {
  // Get temperature from DS18B20 sensor
  sensors.requestTemperatures();
  float temperatureC = sensors.getTempCByIndex(0);

  // Get distance from ultrasonic sensor
  long duration, distanceCm;
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  duration = pulseIn(ECHO_PIN, HIGH);
  distanceCm = duration * 0.034 / 2;

  // Print the results to the serial monitor
  Serial.print("Temperature: ");
  Serial.print(temperatureC);
  Serial.print(" °C, Distance: ");
  Serial.print(distanceCm);
  Serial.println(" cm");

  // Send data to ThingSpeak
  ThingSpeak.setField(1, temperatureC);
  ThingSpeak.setField(2, distanceCm);
  int x = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if(x == 200){
      Serial.println("Channel update successful.");
  }
  else{
      Serial.println("Problem updating channel. HTTP error code " + String(x));
  }

  // Wait a bit before next loop
  delay(20000); // ThingSpeak allows updates every 15 seconds; setting delay to 20 seconds
}