#include <WiFi.h>
#include <ThingSpeak.h>
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
unsigned long myChannelNumber = 2040671;
const char * myWriteAPIKey = "LH5NE49HIOOAUENX";
const int TRIG_PIN = 2;
const int ECHO_PIN = 4;
const int trig1 = 5;
const int echo1 = 18;
const int relay=15;
long duration, distance;
long dur,dis;
int statusCode;
int tank=4000;
void setup() {
Serial.begin(115200);
WiFi.mode(WIFI_STA);
ThingSpeak.begin(client);
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
pinMode(relay, OUTPUT);
pinMode(trig1, OUTPUT);
pinMode(echo1, INPUT);

}
void loop() {
connectToCloud();
computeData();
writeData();

delay(1000);
}
void connectToCloud(){
if(WiFi.status() != WL_CONNECTED) {
Serial.print("Attempting to connect");
while(WiFi.status() != WL_CONNECTED) {
WiFi.begin(ssid, pass);
for(int i=0;i<5;i++) {
Serial.print(".");
delay(1000);
}
}
Serial.println("\nConnected.");
}
}
void computeData(){
distance = getDistanceInCentimeters();
dis=getdis();


Serial.println("-----------");
Serial.println("Dist: " + String(distance));

        if(distance<=100)
      
        if(dis>=100)
        {
        digitalWrite(relay, HIGH);
        Serial.println("Relay On");
        }
        else
        {
          
          digitalWrite(relay, LOW);
        }
      
        else if(distance>=380)
        {
          Serial.println("Relay Off");
          digitalWrite(relay, LOW);
        }
Serial.println("-----------");
}
void writeData(){

ThingSpeak.setField(1, distance);
ThingSpeak.setField(2, dis);
statusCode = ThingSpeak.writeFields(myChannelNumber,myWriteAPIKey);
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
}
long getDistanceInCentimeters() {
digitalWrite(TRIG_PIN,LOW);
delayMicroseconds(2);
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
duration = pulseIn(ECHO_PIN, HIGH);
return (duration * 0.034 / 2);
}
long getdis()
{
  digitalWrite(trig1, LOW);
  delayMicroseconds(2);
  digitalWrite(trig1, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig1, LOW);
  dur= pulseIn(echo1, HIGH);
  return{dur*0.034/2};
  Serial.println(dur);
}