// for ESP8266 NodeMCU board
/*
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

#define trig D3
#define echo D4
#define relay D5
*/

// for ESP32 board
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
 
#define trig 19
#define echo 18
#define relay 5


#define BLYNK_TEMPLATE_ID "TMPLTfE6Z75K"
#define BLYNK_DEVICE_NAME "water level"
#define BLYNK_AUTH_TOKEN "t9-3mS9HMA7CVIcT9ZXNM1gwPPsTrY_t"
#define BLYNK_PRINT Serial

char auth[] = BLYNK_AUTH_TOKEN;//Enter your Auth token
char ssid[] = "Wokwi-GUEST";//Enter your WIFI name
char pass[] = "";//Enter your WIFI password

void setup() {
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);
  pinMode(relay, OUTPUT);
  Serial.begin(9600);
  Blynk.begin(auth, ssid, pass);
  digitalWrite(relay, HIGH);
}

void loop() {
  Blynk.run();
  Wlevel();
}
 
void Wlevel() {
  digitalWrite(trig, LOW);
  delayMicroseconds(4);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  long t = pulseIn(echo, HIGH);
  long temp = t / 29 / 2;
  long cm = map(temp, 0, 100, 100, 0);

  if (cm < 5) {digitalWrite(relay, LOW);} 
  else if (cm > 90) {digitalWrite(relay, HIGH);}
 
  if(digitalRead(relay)){
    Serial.print("Motor is OFF");
    Blynk.virtualWrite(V0, 0);
  }
  else{
    Serial.print("Motor is ON");
    Blynk.virtualWrite(V0, 1);
  }
 
  Serial.print(" - Water full % = ");
  Serial.println(cm);
  Blynk.virtualWrite(V1, cm);
}