#include<WiFi.h>
#include<ThingSpeak.h>
#include <ESP32Servo.h>

const int triggerPin = 13;
const int echoPin = 12;
const int servoPin = 15;

char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
int statusCode;

unsigned long myChannelNumber =  2134278;
const char * myWriteAPIKey = "RXORLZNSE4RUKNEO";

Servo myservo;

void setup() {
  Serial.begin(9600);
  pinMode(triggerPin, OUTPUT);
  pinMode(echoPin, INPUT);
  myservo.attach(servoPin);
  WiFi.mode(WIFI_STA);
   ThingSpeak.begin(client);
}

void loop() {
  if(WiFi.status() != WL_CONNECTED)
  {
    Serial.print("Attempting to connect");
    while(WiFi.status() != WL_CONNECTED)
    {
      WiFi.begin(ssid,pass);
      Serial.print(".");
      delay(5000);
    }
    Serial.println("\nconnected.");
  }
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);

  long duration = pulseIn(echoPin, HIGH);

  float distance = duration * 0.034 / 2.0;
  float waterLevel = map(distance, 0, 400, 100, 0);

  Serial.print("Water level: " +String(waterLevel,1));
  Serial.print(waterLevel);
  Serial.println("%");
   
    ThingSpeak.setField(1,waterLevel);
  statusCode=ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
if(statusCode == 200)
{
  Serial.println("Channel Updated");
 }
 else{
   Serial.println("problem in Updating");
   String(statusCode);
 }
 delay(15000);

  if (waterLevel < 20) {
    myservo.write(90); // rotate servo to 90 degrees
    delay(1000); // delay to give the servo time to move
    myservo.write(0); // turn off the servo
  }
  
}