Why won't my blynk display data from my sensor? can anyone help me fix it?

[PeteKnight]

@chis

How are your V4 to V9 datastreams configured?
A: the datastreams my V9 : interger min 0 max 1
my v4 : interger min 0 max 1000

“V4 to V9” means V4, V5, V6, V7, V8 and V9

The syntax of these Blynk.virtualWrite() commands is incorrect…

@chis

Blynk.virtualWrite(V9, PinRelay, LOW);

@chis

Blynk.virtualWrite(V9, PinRelay, HIGH);

@chis

because my teacher told me to use this myTimerEvent sir

Time to get a new teacher then!
You, and your teacher, should read this…

Keep your void loop() clean

Also this is very bad practice…

@chis

  timer.setInterval(5000L, sensorYL69);
  timer.setInterval(5000L, PhSensor);
  timer.setInterval(5000L, colorSensor);

Because all of your timed functions are trying to execute at the same time, but you aren’t using a multi-tasking MCU.
You should read the “Staggering Timers” part of this tutorial…

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 …

Pete.