Notify widget help

Hello community!

I’m using a local blynk server running on a raspi, I have already set up 5 ESP-12’s with DHT22 sensors which are working just fine.

• Hardware model + communication type = Lolin ESP-12 NodeMCU v3
• Smartphone OS (iOS or Android) + version = iOS 12.1 with notifications enabled
• Blynk server or local server = local server
• Blynk Library version = 0.5.4

Now I’m trying to add a PIR sensor to a new device so it would give me a push notification in case of a movement is detected. First of all I wanted to test the notification itself so I uploaded the example from the docs site.
In this example I’ve added a LED widget to test if the code is working.

So the code is pretty much just a basic example to test the notify widget: when I short the PIN on the ESP, following happens:

  • a blue LED lits on the board
  • I get a serial message “Button is pressed”
  • in the app, the LED widget lit (well, for the 2-3rd try that is)

But I don’t receive a push message at all!

Here comes my code, what’s wrong with it? (token, wlan, IP data are changed)

Kind Regards,

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  Blynk library is licensed under MIT license
  This example code is in public domain.


  Simple push notification example

  App project setup:
    Push widget

  Connect a button to pin 2 and GND...
  Pressing this button will also push a message! ;)

/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial

#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <SPI.h>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "xxyy";
char ssid[] = "xxcc";
char pass[] = "vvbb";

WidgetLED led2(V2);
BlynkTimer timer;

void notifyOnButtonPress()
  // Invert state, since button is "Active LOW"
  int isButtonPressed = !digitalRead(2);
  if (isButtonPressed) {
    Serial.println("Button is pressed.");

    // Note:
    //   We allow 1 notification per 5 seconds for now.
    Blynk.notify("Yaaay... button is pressed!");

    // You can also use {DEVICE_NAME} placeholder for device name,
    // that will be replaced by your device name on the server side.
    //Blynk.notify("Yaaay... {DEVICE_NAME}  button is pressed!");

void setup()
  // Debug console

  Blynk.begin(auth, ssid, pass, IPAddress(11,11,11,11), 2121);

  // Setup notification button on pin 2
  pinMode(2, INPUT_PULLUP);

  // Attach pin 2 interrupt to our handler
  attachInterrupt(digitalPinToInterrupt(2), notifyOnButtonPress, CHANGE);

void loop()

Did you add in the Notification widget?

Also, the way you have it set, it can potentially send multiple notifications in a second, minute, etc… (every interrupt trigger), but only one notification every 5 minutes is allowed.

You need to have some form of logic control with flags and timers. Search this forum for similar notification examples.

1 Like

Of course I did.

Regarding the multiple notifications - shouldn’t it at least send one push notification and ignore the rest?

We never know what people forget :stuck_out_tongue_winking_eye: Did you set it for high priority and make sure all App permissions are enable in the phone settings?

I don’t know… i have never tried to spam a Blynk server before (Cloud or Local).

If it receives many at once, a distinct possibility with button bounce, then it may simply block them all for an indeterminate period. I am sure they have that limitation, and tell everyone about it in the Docs and test script commentary, for a reason.

You could always try a sketch with a single test notification at device boot.

Thank you for the tip Gunner!

Following your advice, wrote a simple code so every time the device boots, it sends a push message - and it’s working!

It really seems that the server (local or otherwise) simply ignoring the messages if it deems to be a spam.

Makes sense… just like email spam filters, etc… even this forum will block your posts if spammy activity is suspected.

Now you can look at timed routines. For example…

  • Upon triggering action, look if “Trigger Flag” is ON or OFF
  • If ON, then do nothing, return to monitoring for trigger
  • If OFF, set Flag to ON, then send notification, then start timeout timer (that will clear Flag back to OFF after x time).

Here is some examples of timers… there is one for a Latch that does what I just referred too.

will do that, thank you!