Blynk do not display any data

Hi, i need help. My blynk app do not display any data . When i upload the coding , there is no error ? Please someone help me . Thank you

first you have to post your sketch
else nobody can help you.
don’t forget to use backticks :joy:

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#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <ESP8266WebServer.h>
#include <SimpleTimer.h>

// Variable init
const int buttonPin = D2; // variable for D2 pin
const int ledPin = D7;
int addr = 0; //endereço eeprom
byte sensorInterrupt = 0; // 0 = digital pin 2

char auth[] = "ed76b860e42d4e818a531957ca5792f2";
char ssid[] = "Lutfil's iPhone";
char pass[] = "hadi123456";

float calibrationFactor = 4.5;
volatile byte pulseCount;
float flowRate;
unsigned int flowMilliLitres;
unsigned long totalMilliLitres;
unsigned long oldTime;
float totalLitres;
SimpleTimer timer;

void setup()
  Blynk.begin(auth, ssid, pass);
  pinMode(buttonPin, INPUT);
  pinMode(ledPin, OUTPUT);

  flowRate = 0.0;
  flowMilliLitres = 0;
  totalMilliLitres = 0;
  oldTime = 0;
  totalLitres = 0;

  timer.setInterval(1000L, showFlow);
  attachInterrupt(digitalPinToInterrupt(buttonPin), pulseCounter, RISING);

void showFlow()
 flowRate = ((1000.0 / (millis() - oldTime)) * pulseCount) / calibrationFactor;
 oldTime = millis();
 flowMilliLitres = (flowRate / 60) * 1000;
 totalMilliLitres += flowMilliLitres;
 totalLitres = totalMilliLitres/1000;

 unsigned int frac;

 // Print the flow rate for this second in litres / minute
 Serial.print("Flow rate: ");
 Serial.print(int(flowRate)); // Print the integer part of the variable
 Serial.print("."); // Print the decimal point
 // Determine the fractional part. The 10 multiplier gives us 1 decimal place.
 frac = (flowRate - int(flowRate)) * 10;
 Serial.print(frac, DEC); // Print the fractional part of the variable
 // Print the number of litres flowed in this second
 Serial.print("  Current Liquid Flowing: "); // Output separator

 // Print the cumulative total of litres flowed since starting
 Serial.print("  Output Liquid Quantity: "); // Output separator

// Print the cumulative total of litres flowed since starting
Serial.print("  Output Liquid Quantity: "); // Output separator

Blynk.virtualWrite(V4, int(flowRate));
Blynk.virtualWrite(V5, int(flowMilliLitres));
Blynk.virtualWrite(V6, int(totalMilliLitres));
Blynk.virtualWrite(V7, float(totalLitres));

pulseCount = 0;

attachInterrupt(sensorInterrupt, pulseCounter, FALLING);


void pulseCounter() 
    // Increment the pulse counter

void loop() 

What does your serial monitor show?

Serial monitor also did not display data

so attachInterrupt don’t work.

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Do you have your serial monitor set to the correct baud rate?

JustBertC no

you need to see serial monitor.
else we can’t help you.

Okay. I’ll try


At the serial monitor, it says isr not in iram! What is that mean ?

Seems it is interrupt issue !
if you are using ESP core 2.5.1 try to downgrade to 2.4.2 or 2.5.0 beta

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Omg! It works. Thank you so much…


you’re welcome :blush:

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