#include <WiFi.h>
#include "DHTesp.h"
#include "ThingSpeak.h"
#include <Adafruit_Sensor.h>
#define SOUND_SPEED 0.034
#define CM_TO_INCH 0.393701


const int DHT_PIN = 15;
const char* ssid = "Wokwi-GUEST";
const char* pass = "";

WiFiClient client;

unsigned long myChannelNumber = 2;
const char* myWriteAPIKey = "T78U2J4YWMURK1GC";
const char* server = "api.thingspeak.com";

unsigned long lasttime = 0;
unsigned long timeDelay = 30000;

const int trigPin = 5;
const int echoPin = 18;
long duration;
float distanceCm;
float distanceInch;
int temperatureC;
int humidity;
int distance;

DHTesp dhtSensor;

void setup () {
Serial.begin(115200);
pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output
pinMode(echoPin, INPUT); // Sets the echoPin as an Input
dhtSensor.setup(DHT_PIN, DHTesp::DHT22);
dhtSensor.getPin();
delay(10);
WiFi.begin(ssid, pass);
while(WiFi.status() !=WL_CONNECTED){
  delay(100);
  Serial.println(",");
}
Serial.println("WiFi Connected!");
Serial.println(WiFi.localIP());

WiFi.mode(WIFI_STA);

ThingSpeak.begin(client);
}

void loop(){
  digitalWrite(trigPin, LOW);
  delayMicroseconds(2);
  // Sets the trigPin on HIGH state for 10 micro seconds
  digitalWrite(trigPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(trigPin, LOW);
  // Reads the echoPin, returns the sound wave travel time in microseconds
  duration = pulseIn(echoPin, HIGH);
  // Calculate the distance
  distanceCm = duration * SOUND_SPEED/2;
  // Prints the distance in the Serial Monitor
 Serial.print("Distance (cm):  ");
 Serial.println(distanceCm);
 temperatureC = dhtSensor.getTemperature();
 Serial.print("Temperature ('C): ");
 Serial.println(temperatureC);
 humidity = dhtSensor.getHumidity();
 Serial.print("Humidity (%); ");
 Serial.println(humidity);

 ThingSpeak.setField(1, temperatureC);
 ThingSpeak.setField(2, humidity);
 ThingSpeak.setField(3, 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));
 }
}