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Need help with data collection in blynk

for this moment I have success uploaded the data into blynk and show in super chart form as shown below
image
but when I tried to download the data in CSV form I get an empty file.
I am new here did I have to add something in my code or the setting in the web console

the coding that i use are show in below, i using nodemcu for uploading the data

#define BLYNK_TEMPLATE_ID "TMPL0mDJu8RE" //Template id
#define BLYNK_DEVICE_NAME "line follower data" //device name
#define BLYNK_PRINT Serial

//wifi connection
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
char auth[] = --; // Blynk Token
char ssid[] =--;
char pass[] =--;
BlynkTimer timer;


//serial connection
#include<SoftwareSerial.h>
SoftwareSerial NodeMCU(12,13);//TX,RX D6,D7 GPIO 12,13

String DataIn;
String dt[10];
char RData;

void setup() {
 Serial.begin(19200);
 NodeMCU.begin(19200);
 Blynk.begin(auth,ssid,pass);
 timer.setInterval(1000L, catchData);
}

void catchData(){
  Blynk.virtualWrite(V3,dt[0].toInt());
  Blynk.virtualWrite(V1,dt[1].toInt());
  Blynk.virtualWrite(V2,dt[2].toInt());
  }

void loop() {
while(NodeMCU.available() > 0 ) 
  {
//break the data string into 3 seperate data
    RData = NodeMCU.read(); 
    DataIn += RData;
    
    //data received
    if(RData =='\n')
    {
      int j = 0;
      dt[j]="";

      for(int i=0; i<DataIn.length();i++)
      {
        if((DataIn[i]==','))
          {
            j++;
            dt[j]="";
          }
        else {
            dt[j]=dt[j]+DataIn[i];
          }
      }
   }
Blynk.run();
timer.run();
}
}

Check this out
https://docs.blynk.io/en/legacy-platform/legacy-articles/keep-your-void-loop-clean

What type of Blynk subscription do you have?

What do your advanced settings for your datastreams look like?

Pete.

1 Like

@PeteKnight thanks a lot i thought i already set the advance setting up but when i double-check the problem is solved :smiley: maybe the last time when i edit the template i accidentally turn off the advance setting