Solved/Eventor with moisture sensor works only when app open/active

Solved
1

Hey there,

I have really gone through all of the threads pertaining to my issue, have read all of the documentation provided and yet cannot solve my possibly very silly mistake i am doing. This is the only comment that might have shown me i am doing something wrong, so I really hope you can help me.

I have added this bit of code to my script :
BLYNK_READ(V5) // Display Widget set to reading rate frequency
{
Blynk.virtualWrite(V5, analogRead(A0)); // Send analog pin value to display Widget at set frequency
}

I have added a gauge that is perfectly reading moisture levels when set to V5, and a set frequency (1 sec)

My Eventor conditions work perfectly as long as I am inside the app, just like you said, but I can’t for the life of me, understand what I have to do to have the conditions constantly working.

Would really appreciate any help with that :slight_smile:

cpp

#define BLYNK_PRINT Serial // Comment this out to disable prints and save space
#include <SPI.h>;
#include <ESP8266WiFi.h>;
#include <BlynkSimpleEsp8266.h>;
#include <SimpleTimer.h>;
#include <DHT.h>;

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

// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "";
char pass[] = "";


BLYNK_READ(V5)  
{
  Blynk.virtualWrite(V5, analogRead(A0)); 
}



#define DHTPIN 4 // What digital pin we're connected to

// Uncomment whatever type you're using!
#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT22 // DHT 22, AM2302, AM2321
//#define DHTTYPE DHT21 // DHT 21, AM2301

DHT dht(DHTPIN, DHTTYPE);
SimpleTimer timer;

// This function sends Arduino's up time every second to Virtual Pin (5, 6, 7 &amp;amp;amp;amp;amp;amp; 8).
// In the app, Widget's reading frequency should be set to PUSH. This means
// that you define how often to send data to Blynk App.
void sendSensor()
{
 float h = dht.readHumidity();
 float t = dht.readTemperature(); // or dht.readTemperature(true) for Fahrenheit

 if (isnan(h) || isnan(t)) {
 Serial.println("Failed to read from DHT sensor!");
 return;
 }
 // You can send any value at any time.
 // Please don't send more that 10 values per second.
 Blynk.virtualWrite(V4, h); // Humidity for gauge
 Blynk.virtualWrite(V6, t); // Temperature for gauge
}

void setup()
{
 Serial.begin(115200); // See the connection status in Serial Monitor
 Blynk.begin(auth, ssid, pass);

 dht.begin();

 // Setup a function to be called every second
 timer.setInterval(1000L, sendSensor);
}

void loop()
{
 Blynk.run(); // Initiates Blynk
 timer.run(); // Initiates SimpleTimer
}
2

It may have to do with your use of V5 twice.

and

Change one of them to a different Vpin, and modify your app accordingly.

3

Thank you for that, i have removed the second part mentioned, and still cannot get the conditions to work outside of the app.

"I believe it could have something to do with gunner’s comment that i saw on another thread :
You can also have the Display widget, by itself, determine the frequency of the data read (but only works when the App/Project is active).

BLYNK_READ(V5)  // Display Widget set to reading rate frequency
{
  Blynk.virtualWrite(V5, analogRead(A0));  // Send analog pin value to display Widget at set frequency
}

"

But i dont know how to go around this.

4

Use Blynk.virtualWrite() commands in a coded and timed function to PUSH your data to the server/app (the Widget also needs to be set to PUSH)

5

To collect data and use any of the widgets, the project must be active/running.

I would think both BLYNK_READ and BLYNK_WRITE would work in the same fashion. One is just the server/app telling the device when to take a measurement and send it to the Virtual Pin, and the other is the device deciding when to take the measurement (via a timer or such) and sending it to the Virtual Pin.

Either way the Virtual Pin gets updated, and should trigger the event in the Eventor Widget.

6

Oh my god man, thank you so much! This must have been one of the promptest and most useful reply, what a great community :slight_smile:

7

Yes, that makes sense of course. I had the project set as active all the time. it seems that putting the write comman in a timed function made it all work!


BlynkTimer timer;

void myTimerEvent()
{
  // You can send any value at any time.
  // Please don't send more that 10 values per second.
  Blynk.virtualWrite(V5,analogRead(A0));
}
1 Like
8

That is the general rule but there are exceptions to the rule e.g. Webhook widget.