#define BLYNK_TEMPLATE_ID "TMPL3VBn6WTqb"
#define BLYNK_TEMPLATE_NAME "IoT waterpump"
#define BLYNK_AUTH_TOKEN "ATVnnH4G1I-o2hwrZVqC3l2pDDsXQoqn"

#define BLYNK_PRINT Serial

#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 16, 2);

const int trigger = 32;
const int echo = 33;
const int pump = 25;

long duration;
float distance, waterlevel;
int levellow = 400;
int levelhigh = 10;

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

void setup(){
    Blynk.begin(auth, ssid, pass);
    lcd.init();
    lcd.backlight();
    lcd.setCursor(0,0);
    lcd.print("Initializing...");
    
    pinMode(trigger, OUTPUT);
    pinMode(echo, INPUT);
    pinMode(pump, OUTPUT);
    
}

void tankLevel(){
    digitalWrite(trigger, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigger, LOW);
    
    duration = pulseIn(echo, HIGH);
    distance = (duration/2)/29.1;
    
    waterlevel = ((distance - levellow)/(levelhigh - levellow))*100;
    if(waterlevel < 0){
    waterlevel = 0;
}
    if(waterlevel > 100){
    waterlevel = 100;
}
    lcd.setCursor(0,0);
    lcd.print("WATERLEVEL=");
    lcd.print(waterlevel);
    lcd.print("%");
    Blynk.virtualWrite(V0, waterlevel);
}

void pumpAutomate(){
    if(waterlevel <= 10){
    digitalWrite(pump, HIGH);
    lcd.setCursor(0,1);
    lcd.print("WATERPUMP=ON ");
}
    else if(waterlevel >= 90){
    digitalWrite(pump, LOW);
    lcd.setCursor(0,1);
    lcd.print("WATERPUMP=OFF");
}
}

void loop(){
    Blynk.run();
    tankLevel();
    pumpAutomate();
}