Update button value when using bridge

Need Help With My Project
1

Hi!

I’m creating a project using bridge that have two nodes. Node A reads temperature and humidity and the nodeB turns on/off a relay based on the humidity readed by nodeA.

In nodeA i got this code to read and change change the state of relay in nodeB:

BLYNK_WRITE(V5) {
  int value = param.asInt();
  autoHumidifier = value;
}

void getBME() {
  if (enableBME) {
    float t = bme.readTemperature();
    float h = bme.readHumidity();
    float p = bme.readPressure() / 100.0F; // hPa
    float alt = bme.readAltitude(SEALEVELPRESSURE_HPA); // m

    changeColor(bme.readTemperature());
    // ADD A CHECK OF THE VALUES TO AVOID DATA CORRUPTION
    if (t > lastT + threshold || t < lastT - threshold) {
      // the reading is outside the admited limits, so, asume the value hasn't changed since last time.
      t = lastT;
    } else {
      lastT = t;
    }
    if (h > lastH + threshold || h < lastH - threshold) {
      // the reading is outside the admited limits, so, asume the value hasn't changed since last time.
      h = lastH;
    } else {
      lastH = h;
    }
    // Check if any reads failed and exit early (to try again).
    if (isnan(h) || isnan(t)) {
      //Blynk.notify("Failed to read sensor");
      //Serial.println("Failed to read sensor");
      return;
    } else {
      Serial.print("t");
      Serial.println(t);
      Serial.print("h");
      Serial.println(h);
      Blynk.virtualWrite(V8, bme.readHumidity());
      Blynk.virtualWrite(V9, bme.readHumidity());
      Blynk.virtualWrite(V10, bme.readTemperature());
      Blynk.virtualWrite(V11, bme.readTemperature());

      if(bme.readHumidity() < 45 && autoHumidifier == 1){
        bridge1.digitalWrite(12,HIGH);
      }else if(bme.readHumidity() > 55 && autoHumidifier == 1){
        bridge1.digitalWrite(12,LOW);
      }
    }
    DHTnextSampleTime = millis() + sampleInterval;
  }

}

BLYNK_CONNECTED() {
  bridge1.setAuthToken("*******"); // Token of the hardware B
}

And in the node B, I have this code:

BLYNK_WRITE(V1) {
  int value = param.asInt();
  digitalWrite(12, value);
}

I want to change the state of button in nodeB based on the bridged action by nodeA. In the documentation it’s said that:

Keep in mind that bridge.virtualWrite doesn’t send any value to mobile app. You need to call Blynk.virtualWrite for that.

But I’m not sure how I need to do that. Thanks!

2

Treat it the same as if from an App widget… only the state change of the virtual pin is coming from the other bridged device.

E.g. on Device A you use the command: bridge1.virtualWrite(vPin, value); where vPin is the pin being controlled via the BLYNK_WRITE(vPin) on Device B.

3

Right. You need to intrduce one more pin for sending value (button state) via bridge and from there doing Blynk.virtualWrite (in your Node B code) to update button in your app.
Another approach would be to have timer in your Node B that checks digital pin status and, if needed, updates app button state.

4

Thanks!

Can I update the value of V1 of nodeB (to change how the button looks) from nodeA?