How to display on blynk chart

Solved
1

how can i display the data using graph widget on blynk??? help me please, im beginner… im appreciate ur help…tq all

below are my ino.

#define BLYNK_PRINT Serial
#include <Filters.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

const int LED =25;
const int Relay =33;

float testFrequency = 60;                     // test signal frequency (Hz)
float windowLength = 20.0/testFrequency;     // how long to average the signal, for statistist
 int sensorValue = 0;
float intercept = -0.1129; // to be adjusted based on calibration testing
float slope = 0.0065; // to be adjusted based on calibration testing
float current_amps; // estimated actual current in amps

unsigned long printPeriod = 1000; // in milliseconds
// Track time in milliseconds since last reading 
 unsigned long previousMicros = 0;

void setup() {
 Serial.begin( 57600 );    // start the serial port
pinMode(Relay, OUTPUT);
pinMode(LED,OUTPUT);


}

void loop() {
 RunningStatistics inputStats;                 // create statistics to look at the raw test signal
 inputStats.setWindowSecs( windowLength );

 while( true ) {   
  sensorValue = analogRead(A0);  // read the analog in value:
 inputStats.input(sensorValue);  // log to Stats function
    
    if((unsigned long)(millis() - previousMicros) >= printPeriod) {
  previousMicros = millis();   // update time
  
  // display current values to the screen
  Serial.print( "\n" );
  // output sigma or variation values associated with the inputValue itsel
  Serial.print( "\tsigma: " ); 
  Serial.print( inputStats.sigma() );
  // convert signal sigma value to current in amps
  current_amps = intercept + slope * inputStats.sigma();
  Serial.print( "\tamps: " ); 
  Serial.print( current_amps );

  if (current_amps >= 20)
  {
    digitalWrite(LED, LOW);
    digitalWrite(Relay, HIGH);
    Serial.print("fault occur");
delay(500);
digitalWrite(LED, LOW);
delay(500);
digitalWrite(LED, HIGH);
delay(500);
digitalWrite(LED, LOW);
delay(500);
digitalWrite(LED, HIGH);
delay(500);
digitalWrite(LED, LOW);
delay(500);
digitalWrite(LED, HIGH);
delay(500);
digitalWrite(LED, LOW);
delay(500);
digitalWrite(LED, HIGH);
delay(500);
digitalWrite(LED, LOW);
delay(500);
digitalWrite(LED, HIGH);
delay(500);
digitalWrite(LED, LOW);
delay(500);
digitalWrite(LED, HIGH);
delay(500);
digitalWrite(LED, LOW);
delay(500);
digitalWrite(LED, HIGH);
delay(500);
digitalWrite(LED, LOW);
delay(500);
digitalWrite(LED, HIGH);
delay(500);
digitalWrite(LED, LOW);
delay(500);
digitalWrite(LED, HIGH);
delay(500);
digitalWrite(LED, LOW);
delay(500);
}
else
{
 digitalWrite(Relay, LOW);
 delay(100);
     }
    }
   }
}
2

i wanted to display the current value on chart terminal…and then when the current exceed 20A, the notification will be display on my LCD that showing “fault occurs”… tq sir…

3
4
5

im trying sir…but i still fail…can u show me what should i added on my ino.???

6

your void loop() will never work with Blynk

You need to time events with timer:
https://examples.blynk.cc/?board=ESP32&shield=ESP32%20WiFi&example=GettingStarted%2FPushData

I really suggest you read the article first

7

my void loop will never work with blynk??? so what should i do sir??? i just want to display on blynk… can u suggest me another ways sir??? its my final year project…

8

Are you serious?

Ok, I will paste the article here, so that you don’t need to click

Avoiding the void

:point_up: :fire: :warning: VERY IMPORTANT: You can’t send sensor data in your void loop()

– Why?
– Because Blynk sends data over the Internet, and when you put something into void loop(), your microcontroller will execute it :scream_cat: gazillion number of times. Which means that Blynk Cloud will be flooded with gazillion messages from your hardware.

And when Blynk Cloud notices that, it automatically :scissors:︎ cuts your connection. Sorry…

– OK, what should I do then?
– Send sensor data in intervals!

Using timers to send sensor data in intervals
There are lots of ways to send data in intervals, but here is a simple one. We recommend using a BlynkTimer for that. It’s included in Blynk Library Package, so if you installed Library correctly, you are all set.

Open Blynk app:

  • Create a New Project (new Auth Token will be sent to your email)
  • Add Value Display Widget
  • Go to Widget Settings
  • Set PIN to V5
  • Set Frequency to PUSH
    It means that Blynk app will be waiting for the data whenever your hardware sends it.

Preparing the code:

Open this example sketch. Just change it to your hardware and connection;

  • Check your email inbox for Auth Token;
  • Insert your Auth Token in the sketch;
  • :zap: Flash the code to your hardware;
  • In the Blynk app - press Play button;
  • You should see the data coming;
    Let’s look at the code so you better understand it for your next projects.

We create a BlynkTimer object, called… timer:

BlynkTimer timer; // Announcing the timer
Then we are creating a function that should be performed in intervals. We will read the sensor connected to A0, and then send it to Virtual Pin V5:

void myTimerEvent()
{
  sensorData = analogRead(A0);
  Blynk.virtualWrite(V5, sensorData);
}

In setup, we declare that our function myTimerEvent() should run every 1000 milliseconds, which is 1 second.

void setup()
{
  ...
  ...
  ...
  timer.setInterval(1000L, myTimerEvent);
}

And now look at our beautiful void loop()

void loop()
{
  Blynk.run();
  timer.run(); // running timer every second
}
9

sory sir…i do read that already…but i still dont get what should i do… sory for buden u sir…i dont mean that… i just beginner…im sory sir…

10

If you did that, please show your code.

11

i dont know how to recall the data on my void loop?? still working on that coding…sory sir…

12

I guess the quality of school just isn’t what it used to be :stuck_out_tongue: I remember being taught to do my own research… here it comes… :stuck_out_tongue_winking_eye:

Blynk - RE-SEAR-CH

Perhaps you can start with some basic examples and work your way up through them until you have a better understanding of how Blynk, and code, works?

13

sir, thank for ur guidance… my problem solve… im sorry for burden u… but thanks, i learn a lot and know, i get what u re saying to me…PROBLEM SOLVE