Device wont connect online after reflashing code

[PeteKnight]

Wow, where to begin!!

What is this code intended to achieve?..

@Mischief

int doseML_A = digitalRead(V15);
int doseML_B = digitalRead(V16);
int doseML_C = digitalRead(V17);  //*EXTENSION* copy          <- initalize and declare pump inital value
                                 //*EXTENSION* paste here
int calA = digitalRead(V21);
int calB = digitalRead(V22);
int calC = digitalRead(V23);    //*EXTENSION* copy          <- initalize and declare pump inital value

@Mischief

This piece of code is about as bad as it gets when it comes to working with Blynk, as it has a `while` loop and a delay within the `while` loop...

BLYNK_WRITE(V0)
{
  // Set incoming value from pin V0 to a variable
  // Update state
  int count = param.asInt();
 while(count == 1 && SHUT_DOWN==0){
    digitalWrite(V27, 1);
    digitalWrite(RELAY_PIN,1);
    delay(timecheck*1000);        //change to millis so kill code works mid feed = CALIBRATE 
    digitalWrite(RELAY_PIN,0);
    count = 0; 
    digitalWrite(V27, 0);
  }
}

You’re also doing digitalWrites to physical pins that don’t exist on the ESP32. Are these meant to be Blynk.virtuaWrites ?

I’d suggest that you do a little reading…

Keep your void loop() clean

Using BlynkTimer or SimpleTimer

Many users seem to struggle with the basic concepts of using BlynkTimer in their projects, despite the excellent discussions and tutorials that exist on this forum, so I thought I’d write a guide that will hopefully help clarify things. It’s rather long, as it attempts to explain the reasoning behind why and how we use timers, and covers some more advanced subjects, but I’ve tried to organise it in a way that helps people to find answers to specific questions… Why use a timer at all? Let’s say …

Using Virtual Pins to control physical devices

I thought I’d write a guide about how to use virtual pins with app widgets such as buttons, to control physical devices such as relays, LEDs etc… Why use virtual pins anyway? I’d always recommend using virtual pins over physical pins when developing your code. There are a number of reasons, but here are what I consider to be the main ones: Virtual pins are hardware independent. This means that it’s far easier to port your code from one hardware platform to another in future (when you realise…

Pete.