Virtual button to control relay on GPIO 16

[PeteKnight]

The command to ask the Blynk server to send you the latest value for the slider widget attached to pin V7…

@PeteKnight

You should remove your code from that function and add a Blynk.syncVirtual(V7) command to get the latest value from your slider widget.

@Blynk_Coeur

Blynk.syncVirtual(V7) must be in BLYNK_CONNECTED()

Pete.

[Uzzy]

@PeteKnight like this?

#define BLYNK_TEMPLATE_ID ""
#define BLYNK_DEVICE_NAME ""
#define BLYNK_FIRMWARE_VERSION        "1.0"
#define BLYNK_PRINT Serial
//#define BLYNK_DEBUG
#define APP_DEBUG

const int wifists=2;
int slider;
#include "BlynkEdgent.h"
#define USE_NODE_MCU_BOARD

BLYNK_WRITE(V7)
{
 slider = param.asInt();
}
  
BLYNK_WRITE(V0)
{
  int pin = param.asInt();
  if (param.asInt()){
  digitalWrite(16, LOW);
  timer.setTimeout(slider, [] () {digitalWrite(16, HIGH);Blynk.virtualWrite(V0,LOW);} );
  } else {
  digitalWrite(16, HIGH);  
  }
  {
 if (Blynk.connected()) {
    digitalWrite(wifists, HIGH);//turn on wifi status led if device isconnected to internet
  } else {
    digitalWrite(wifists, LOW);
  }
  
}
}
void setup() {
  Serial.begin(115200);
  delay(100);
  pinMode(16, OUTPUT);
  pinMode(wifists, OUTPUT);
  digitalWrite(16,HIGH);
  BlynkEdgent.begin();
  
}
BLYNK_CONNECTED()
{
  Blynk.syncVirtual(V7);
}
void loop() {
  BlynkEdgent.run();
  timer.run();
}

[Blynk_Coeur]

Yes

[Uzzy]

phew!
but i have a feeling that

 {
 if (Blynk.connected()) {
    digitalWrite(wifists, HIGH);//turn on wifi status led if device isconnected to internet
  } else {
    digitalWrite(wifists, LOW);
  }
  
}

shouldnt be in the place where it is right now

@Uzzy

like this?

[PeteKnight]

You didn’t answer this question…

@PeteKnight

When do you think BLYNK_WRITE(V0) will trigger, and do you think it’s possible for it to trigger is the device isn’t connected to the Blynk server?

If you had have answered it correctly then you would have said that the device MUST be connected to the Blynk server for BLYNK_WRITE(V0), so putting this test into BLYNK_WRITE(V0) is a total waste of time…

@Uzzy

 if (Blynk.connected()) {
    digitalWrite(wifists, HIGH);//turn on wifi status led if device isconnected to internet
  } else {
    digitalWrite(wifists, LOW);
  }

Because Blynk.connected will ALWAYS be true when BLYNK_WRITE(V0) executes.

As I said before, but you chose to ignore, when this piece of code was in your void loop…

@PeteKnight

You can use a timer to call that code.

Pete.

[Uzzy]

@Uzzy

{
 if (Blynk.connected()) {
    digitalWrite(wifists, HIGH);//turn on wifi status led if device isconnected to internet
  } else {
    digitalWrite(wifists, LOW);
  }
  
}

so this should go under BLYNK_CONNECTED?
i find it hard to figure out how to use a timer to call this functiin

[PeteKnight]

@Uzzy

so this should go under BLYNK_CONNECTED?

No, we’ve been there already and the answer is still no.

@Uzzy

i find it hard to figure out how to use a timer to call this functiin

Same answer as before…

@PeteKnight

@Uzzy

how do i use a timer to call this code

I’ve already linked you to a tutorial on timers in post #2 and @John93 has already linked you to the ‘keep your void loop clean’ tutorial in post #23
If you’d read either of these you wouldn’t be asking this question.

Pete.

[Uzzy]

@PeteKnight I tried reading both posts linked in post #2 again…and i couldn’t find anything that relates to using a timer to

@PeteKnight

call that code.

any help would be appreciated

[Uzzy]

@John93

You should read this
https://docs.blynk.io/en/legacy-platform/legacy-articles/keep-your-void-loop-clean

read this too and this is what i came up with

#define BLYNK_TEMPLATE_ID ""
#define BLYNK_DEVICE_NAME ""
#define BLYNK_FIRMWARE_VERSION        "1.0"
#define BLYNK_PRINT Serial
//#define BLYNK_DEBUG
#define APP_DEBUG

const int wifists=2;
int slider;
#include "BlynkEdgent.h"
BlynkTimer ledtimer;

#define USE_NODE_MCU_BOARD

BLYNK_WRITE(V7)
{
 slider = param.asInt();
}
  
BLYNK_WRITE(V0)
{
  int pin = param.asInt();
  if (param.asInt()){
  digitalWrite(16, LOW);
  timer.setTimeout(slider, [] () {digitalWrite(16, HIGH);Blynk.virtualWrite(V0,LOW);} );
  } else {
  digitalWrite(16, HIGH);  
  }
  
}
void setup() {
  Serial.begin(115200);
  delay(100);
  pinMode(16, OUTPUT);
  pinMode(wifists, OUTPUT);
  digitalWrite(16,HIGH);
  BlynkEdgent.begin();
  ledtimer.setInterval(1000L, senddata);
}
void senddata()
{
  {
 if (Blynk.connected()) {
    digitalWrite(wifists, HIGH);//turn on wifi status led if device isconnected to internet
  } else {
    digitalWrite(wifists, LOW);
  }
  
}
}

BLYNK_CONNECTED()
{
  Blynk.syncVirtual(V7);
}
void loop() {
  BlynkEdgent.run();
  timer.run();
  ledtimer.run();
}

[PeteKnight]

@Uzzy

void senddata()

Giving your functions names that describe what they do is always a good idea. This function isn’t sending data to Blynk, so calling it sendData isn’t a great idea.

You have one BlynkTimer object declared, called ledtimer…

@Uzzy

BlynkTimer ledtimer;

But you are calling this BlynkTimer object and the now non-existent BlynkTimer object called timer in your void loop…

@Uzzy

  timer.run();
  ledtimer.run();

This will cause a compiler error (unless you’re running a very early version of the Edgent example).

If you’d actually bothered to read my timers tutorial you would have seen that each BlynkTimer object can support upto 16 timers - that’s 16 separate timer declarations in void setup like this…

@Uzzy

ledtimer.setInterval(1000L, senddata);

So using a generic name for your timer object - such as timer - makes more sense, as that one BlynkTimer object can be used to call functions which perform very different functions, not just switching the state of an LED.

I think I’ll step back from further comments on your posts, other than ones that require moderator input, as I find your unwillingness to read information that is provided to you at odds with my approach.

Pete.

[Uzzy]

@PeteKnight

I think I’ll step back from further comments on your posts, other than ones that require moderator input, as I find your unwillingness to read information that is provided to you at odds with my approach.

I am sorry for my not proprly understanding what you meant; im new to the blynk software…

@PeteKnight

early version of the Edgent example

I think im using the newer version(the blynnk library installed is 1.1.0)
the code compiles fine

#define BLYNK_TEMPLATE_ID ""
#define BLYNK_DEVICE_NAME ""
#define BLYNK_FIRMWARE_VERSION        "1.0"
#define BLYNK_PRINT Serial
//#define BLYNK_DEBUG
#define APP_DEBUG

const int wifists=2;
int slider;
#include "BlynkEdgent.h"

#define USE_NODE_MCU_BOARD

BLYNK_WRITE(V7)
{
 slider = param.asInt();
}
  
BLYNK_WRITE(V0)
{
  int pin = param.asInt();
  if (param.asInt()){
  digitalWrite(16, LOW);
  timer.setTimeout(slider, [] () {digitalWrite(16, HIGH);Blynk.virtualWrite(V0,LOW);} );
  } else {
  digitalWrite(16, HIGH);  
  }
  
}
void setup() {
  Serial.begin(115200);
  delay(100);
  pinMode(16, OUTPUT);
  pinMode(wifists, OUTPUT);
  digitalWrite(16,HIGH);
  BlynkEdgent.begin();
  timer.setInterval(1000L, connect);
}
void connect()
{
  {
 if (Blynk.connected()) {
    digitalWrite(wifists, HIGH);//turn on wifi status led if device isconnected to internet
  } else {
    digitalWrite(wifists, LOW);
  }
  
}
}

BLYNK_CONNECTED()
{
  Blynk.syncVirtual(V7);
}
void loop() {
  BlynkEdgent.run();
  timer.run();
  
}

This is my code as of now , and i hope ive not done any mistakes

[Uzzy]

@Blynk_Coeur
@John93
anyone willing to just check my code
I apologize for the previous bhaviour

[John93]

@Uzzy

I think im using the newer version(the blynnk library installed is 1.1.0)

The latest version of the C++ Blynk library is 1.2.0

@Uzzy

const int wifists=2;

If you go to the settings.h tab, you will notice that pin 2 is already in use.

#define BOARD_LED_PIN               2

If you use the same pin for several porpoises, your software will become unstable. You should change it to something else. For example,

const int wifists=5;

@Uzzy

BLYNK_WRITE(V7)
{
 slider = param.asInt();
}

How did you configure the V7 datastream?

[Uzzy]

@John93

The latest version of the C++ Blynk library is 1.2.0

Just updated the library an the code compiles fine.

@John93

pin 2 is already in use.

I thought that using pin 2 would b a good idea as the onboard led is connected to pin 2 and it would be easier to see th connection status without the need of hooking up a seperate LED.
is it possible to change

@John93

#define BOARD_LED_PIN 2

the pin in the settings tab?

@John93

How did you configure the V7 datastream?

You mean in the blynk. cloud dashboard;
data type as integer,
min value= 500,
max value=5000
default value=750

[John93]

@Uzzy

is it possible to change

@John93

#define BOARD_LED_PIN 2

the pin in the settings tab?

Yes.

[Uzzy]

@John93

Yes.

should there be a led hoooked to whichever pin i connect the BOARD_LED_PIN to?

i tried only integer and not long int. should i try long int too?
from what i understood,i dont think long int will be needed in this case as im using values from 500 to 5000

[John93]

@Uzzy

should there be a led hoooked to whichever pin i connect the BOARD_LED_PIN to?

It’s optional. You can add one if you like.

@Uzzy

i tried only integer and not long int. should i try long int too?

@Uzzy

i tried only integer and not long int. should i try long int too?
from what i understood,i dont think long int will be needed in this case as im using values from 500 to 5000

If you are working with numbers that are within the range of int, then using int instead of long int should not cause any issues. However, if you are working with numbers that are larger than the range of int, then using int instead of long int could cause overflow issues, where the value stored in the variable exceeds the maximum representable value.

[Uzzy]

Thanks for the help

@John93

#define BOARD_LED_PIN 2

I checked the settings.h tab but couldnt find this line of code
btw…how do i use this code for multiple buttons and relays (3 buttons and relays while using the same slider as the timeout value for all buttons and relays)
Heres my code

#define BLYNK_TEMPLATE_ID ""
#define BLYNK_DEVICE_NAME ""
#define BLYNK_FIRMWARE_VERSION        "1.0"
#define BLYNK_PRINT Serial
//#define BLYNK_DEBUG
#define APP_DEBUG

const int wifists=2;
int slider;
#include "BlynkEdgent.h"

#define USE_NODE_MCU_BOARD

BLYNK_WRITE(V7)
{
 slider = param.asInt();
}
  
BLYNK_WRITE(V0)
{
  int pin = param.asInt();
  if (param.asInt()){
  digitalWrite(16, LOW);
  timer.setTimeout(slider, [] () {digitalWrite(16, HIGH);Blynk.virtualWrite(V0,LOW);} );
  } else {
  digitalWrite(16, HIGH);  
  }
  
  
}
void setup() {
  Serial.begin(115200);
  delay(100);
  pinMode(16, OUTPUT);
  pinMode(wifists, OUTPUT);
  digitalWrite(16,HIGH);
  BlynkEdgent.begin();
  timer.setInterval(1000L, connect);
}
void connect()
{
  {
 if (Blynk.connected()) {
    digitalWrite(wifists, HIGH);//turn on wifi status led if device isconnected to internet
  } else {
    digitalWrite(wifists, LOW);
  }
  
}
}

BLYNK_CONNECTED()
{
  Blynk.syncVirtual(V7);
}
void loop() {
  BlynkEdgent.run();
  timer.run();
  
}

[Uzzy]

#define BLYNK_TEMPLATE_ID ""

#define BLYNK_DEVICE_NAME ""

#define BLYNK_FIRMWARE_VERSION        "1.0"

#define BLYNK_PRINT Serial

//#define BLYNK_DEBUG

#define APP_DEBUG

const int wifists=2;

int slider;

#include "BlynkEdgent.h"

#define USE_NODE_MCU_BOARD

BLYNK_WRITE(V7)

{

 slider = param.asInt();

}

 

BLYNK_WRITE(V0)

{

  int pin = param.asInt();

  if (param.asInt()){

  digitalWrite(16, LOW);

  timer.setTimeout(slider, [] () {digitalWrite(16, HIGH);Blynk.virtualWrite(V0,LOW);} );

  } else {

  digitalWrite(16, HIGH);  

  }

}

  BLYNK_WRITE(V1)

{

  int pin = param.asInt();

  if (param.asInt()){

  digitalWrite(4, LOW);

  timer.setTimeout(slider, [] () {digitalWrite(4, HIGH);Blynk.virtualWrite(V1,LOW);} );

  } else {

  digitalWrite(4, HIGH);  

  }

}

BLYNK_WRITE(V2)

{

  int pin = param.asInt();

  if (param.asInt()){

  digitalWrite(5, LOW);

  timer.setTimeout(slider, [] () {digitalWrite(5, HIGH);Blynk.virtualWrite(V2,LOW);} );

  } else {

  digitalWrite(5, HIGH);  

  }

}

void setup() {

  Serial.begin(115200);

  delay(100);

  pinMode(16, OUTPUT);

  pinMode(4, OUTPUT);

  pinMode(5, OUTPUT);

  pinMode(wifists, OUTPUT);

  digitalWrite(16,HIGH);

  digitalWrite(4,HIGH);

  digitalWrite(5,HIGH);

  BlynkEdgent.begin();

  timer.setInterval(1000L, connect);

}

void connect()

{

  {

 if (Blynk.connected()) {

    digitalWrite(wifists, HIGH);//turn on wifi status led if device isconnected to internet

  } else {

    digitalWrite(wifists, LOW);

  }

 

}

}

BLYNK_CONNECTED()

{

  Blynk.syncVirtual(V7);

}

void loop() {

  BlynkEdgent.run();

  timer.run();

 

}

Here’s what i came up with
hope there are no errors

[John93]

@Uzzy

I checked the settings.h tab but couldnt find this line of code

It’s line number 15.

@Uzzy

hope there are no errors

Looks ok. Have you tried it?