Turn on led when is in interval analog read

Need Help With My Project
1

As a title, i can control an analog pin in specific range.
I Have a V2 that enable or disable a command:
when V2 is enable, the analog pin A3 read the value and switch on or off digitalpin 10, when V2 is disable stop the control. Now work but in both position of V2. Why?

#define BLYNK_PRINT SwSerial
#include <SoftwareSerial.h>
SoftwareSerial SwSerial(10, 11); // RX, TX
#include <BlynkSimpleStream.h>
char auth[] = "char_auth";
int btnSV0 = 0; //Stato pin Virtual 0
int btnSV1 = 0; //Stato pin Virtual 1
int btnSV2 = 0; //Stato pin Virtual 2
bool BTN1 = false;
bool BTN2 = false; //flags
int luminosita;
BlynkTimer timer;
WidgetLED led1(V3);
int relay;

void setup()
{
  // Debug console
  SwSerial.begin(9600);
  Serial.begin(9600);
  Blynk.begin(Serial, auth);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(10, OUTPUT);
  pinMode (A3, LOW);
}

void readLight() {

  if (analogRead(A3) > 500) {
    digitalWrite(10, HIGH);
  }
  else {
    digitalWrite(10, LOW);
  }
}

BLYNK_CONNECTED() {
  Blynk.syncAll();
}

void relay_giu() {
  digitalWrite(relay, LOW);
}

BLYNK_WRITE(V2) {
  BTN1 = true;
  led1.on();
  btnSV2 = param.asInt();
  if (btnSV2 == 0) {
    Blynk.virtualWrite(V0, LOW);
    Blynk.virtualWrite(V1, LOW);
    timer.setInterval(500L, readLight);  
  } else {
    BTN1 = false;
    led1.off();
  }
}

BLYNK_WRITE(V0) { // Alza serranda 1
  if (BTN1 == false) {
    btnSV0 = param.asInt();
    if (btnSV0 == 0)
    {
      digitalWrite(4, HIGH);
      digitalWrite(5, HIGH);
    }
    else
    {
      digitalWrite(4, LOW);
    }
  }
}

BLYNK_WRITE(V1) // Abbassa serranda 1
{
  relay = 4;
  if (BTN1 == false) {
    btnSV1 = param.asInt();
    if (btnSV1 == 0)
    {
      digitalWrite(4, HIGH);
      digitalWrite(3, HIGH);
    }
    else
    {
      digitalWrite(3, LOW);
      timer.setTimeout(150, relay_giu);
    }
  }
}

void loop()
{
  Blynk.run();
  timer.run();
}
2

First of all, you need to correctly format your code:
Blynk - FTFC

Secondly, you need to post your full code, not just a snippet.

Thirdly, you need to explain (preferably in English) what each of your virtual pins are connected to, and what they do, so we can understand the logic of what you’re trying to achieve.

Pete.

3

Sorry I have italian keyboard

4

I think you have to do a Blynk.syncVirtual(Vx) after your Blynk.VirtualWrite(Vx) command for it to have any effect.

You seem to have another problem though, as although you’re starting the timer that calls your readLight function, you’re never cancelling it.

Pete.