#define BLYNK_TEMPLATE_ID "TMPL52mlVWMHA"
#define BLYNK_TEMPLATE_NAME "voltage sensor"
#define BLYNK_AUTH_TOKEN "F4Lh67JCGrWJqYweC8vfhPxfMf81ok2H"


#define BLYNK_PRINT Serial


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

char auth[] = BLYNK_AUTH_TOKEN;

// My WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

BlynkTimer timer;



#define PIN_TRIG 26
#define PIN_ECHO 25
#define LOWLED 18
#define MIDLED 19
#define HIGHLED 21
#define Power 27


//Change the virtual pins according the Voltage
#define HIGHLED_vpin V1
#define MIDLED_vpin V2
#define LOWLED_vpin V3 
#define Power_vpin V4

unsigned int level = 0;


//--------------------------------------------------------------------------
// This function is called every time the Virtual Pin state change
// i.e when web LEd Moves from Any volatge from Blynk App or Web Dashboard
BLYNK_WRITE(HIGHLED_vpin) {
    level = param.asInt();
  digitalWrite(HIGHLED, level);
}
//--------------------------------------------------------------------------
BLYNK_WRITE(MIDLED_vpin) {
  level = param.asInt();
  digitalWrite(MIDLED, level);
}
//--------------------------------------------------------------------------
BLYNK_WRITE(LOWLED_vpin) {
  level = param.asInt();
  digitalWrite(LOWLED, level);
}
//--------------------------------------------------------------------------
BLYNK_WRITE(Power_vpin) {
  level = param.asInt();
  digitalWrite(Power, level);
}


//------------------------------------------------------------------------------
// This function is called every time the device is connected to the Blynk.Cloud
// Request the latest state from the server
BLYNK_CONNECTED() {
  Blynk.syncVirtual(HIGHLED);
  Blynk.syncVirtual(MIDLED);
  Blynk.syncVirtual(LOWLED);
  Blynk.syncVirtual(Power);
}



void setup() {
Serial.begin(115200);

pinMode(LOWLED, OUTPUT);
pinMode(MIDLED, OUTPUT);
pinMode(HIGHLED, OUTPUT);
pinMode(Power, OUTPUT);
digitalWrite(LOWLED, HIGH);
digitalWrite(MIDLED, HIGH);
digitalWrite(HIGHLED, HIGH);
digitalWrite(Power, LOW);

pinMode(PIN_TRIG, OUTPUT);
pinMode(PIN_ECHO, INPUT);

Blynk.begin(auth, ssid, pass);

}

void loop() {
  Blynk.run();
  timer.run();
  
  Read_level();

}

void Read_level() {

    // Start a new measurement
digitalWrite(PIN_TRIG, HIGH);
delayMicroseconds(10);
digitalWrite(PIN_TRIG, LOW);

// To read the result
int duration = pulseIn(PIN_ECHO,HIGH);
Serial.print("Distance in CM: ");
Serial.println(duration / 58);
Serial.println("Distance in inches: ");
Serial.println(duration / 148);
level = duration / 58;

if ((level < 100) && (level < 240)){
  digitalWrite(LOWLED, LOW);
  Blynk.virtualWrite(LOWLED_vpin, HIGH); 
  digitalWrite(Power, HIGH);
  Blynk.virtualWrite(Power_vpin, HIGH); 
  digitalWrite(HIGHLED, HIGH);
  Blynk.virtualWrite(HIGHLED_vpin, LOW); 
  digitalWrite(MIDLED, HIGH);
  Blynk.virtualWrite(MIDLED_vpin, LOW); 
  Blynk.logEvent("below_240v");

}
else if ((level < 300) && (level < 280)){
  digitalWrite(LOWLED, HIGH);
  Blynk.virtualWrite(LOWLED_vpin, LOW); 
  digitalWrite(HIGHLED, HIGH);
  Blynk.virtualWrite(HIGHLED_vpin, LOW); 
  digitalWrite(MIDLED, LOW);
  Blynk.virtualWrite(MIDLED_vpin, HIGH); 
  Blynk.logEvent("almost_below_240v");

}
else if (level >= 400){
  digitalWrite(HIGHLED, LOW);
  Blynk.virtualWrite(HIGHLED_vpin, HIGH); 
  digitalWrite(MIDLED, HIGH);
  Blynk.virtualWrite(MIDLED_vpin, LOW); 
  digitalWrite(LOWLED, HIGH);
  Blynk.virtualWrite(LOWLED_vpin, LOW); 
  digitalWrite(Power, LOW);
  Blynk.virtualWrite(Power_vpin, LOW); 
  Blynk.logEvent("power_good_and_stable");

}
}