Compliation error. Please help. I just want to blink 3 lights

[rameshpersuader]

#include <SoftwareSerial.h>
SoftwareSerial DebugSerial(2, 3); // RX, TX

#include <BlynkSimpleStream.h>

BlynkTimer timer;

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "bML9YS";

const int Green=2;
const int Orange=3;
const int Red=4;

void setup() 
{
pinMode(2, OUTPUT); 
pinMode(3, OUTPUT); 
pinMode(4, OUTPUT); 

  Serial.begin(9600);
  Blynk.begin(Serial, auth);
}

void loop() 
{
  Blynk.run();
  timer.run();
  lightcycle();
  
}

void lightcycle()
{
  if BLYNK_WRITE(V1)
{
 if(param.asInt() == 1)
 {
digitalWrite(2, LOW);digitalWrite(3, LOW);digitalWrite(4, HIGH); delay(2000);
digitalWrite(2, LOW);digitalWrite(3, HIGH);digitalWrite(4, LOW); delay(2000);
digitalWrite(2, HIGH);digitalWrite(3, LOW);digitalWrite(4, LOW); delay(2000);
  }
else 
 {
digitalWrite(2, LOW);digitalWrite(3, LOW);digitalWrite(4, LOW); 
  }
 }
}

[PeteKnight]

What is the error, and where does it occur?

Pete.

[rameshpersuader]

It says error compiling for board Arduino Mega 2560.

[PeteKnight]

I think you’ll find that if you scroll up the compilation information then there will be more info available.

But, you can’t do this…

@rameshpersuader

void lightcycle()
{
  if BLYNK_WRITE(V1)
{

BLYNK_WITE(V1) is a function, and it can’t be inside another function (lightcycle in this case).

Pete.

[rameshpersuader]

Yes it throws this error. But How can I achieve this? I want to blink 3 leds one by one when I press V1 in the app

[PeteKnight]

Read this…

Using Virtual Pins to control physical devices

I thought I’d write a guide about how to use virtual pins with app widgets such as buttons, to control physical devices such as relays, LEDs etc… Why use virtual pins anyway? I’d always recommend using virtual pins over physical pins when developing your code. There are a number of reasons, but here are what I consider to be the main ones: Virtual pins are hardware independent. This means that it’s far easier to port your code from one hardware platform to another in future (when you realise…

Pete.

[rameshpersuader]

Thanks for providing this article. I have read it yesterday But in that case how would I add delay between those relays? Here I have the same case with LED’s

[PeteKnight]

You need to read-up about using BlynkTimer in Timeout mode.

Pete.

[rameshpersuader]

@PeteKnight

BlynkTim

I have read about BlinkTimer but unable to figure out how that will be useful here. I have posted the video. I want my LED’s to blink in this exact way . VID_20210326_064858.mp4 - Google Drive Please tell me how to make this possible with blynk

[PeteKnight]

@rameshpersuader

Please tell me how to make this possible with blynk

By using a BlynkTimer in Timeout mode instead of your delay commands.

Pete.

[rameshpersuader]

I recently came to know that Blynk has restrictions with delay. I want to blink 3 leds one after other like traffic signal lights with 1 sec frequency. Below is the code which is run on arduino normally. How can I do that without delay in Blynk. Please help me how to write that one line.

#include <SoftwareSerial.h>
SoftwareSerial DebugSerial(2, 3); // RX, TX

#include <BlynkSimpleStream.h>

BlynkTimer timer;

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "bML9YS";

const int Green=2;
const int Orange=3;
const int Red=4;

void setup() 
{
pinMode(2, OUTPUT); 
pinMode(3, OUTPUT); 
pinMode(4, OUTPUT); 

  Serial.begin(9600);
  Blynk.begin(Serial, auth);
}

void loop() 
{
  Blynk.run();
  timer.run();
  BLYNK_WRITE(V1)
}
BLYNK_WRITE(V1)
{
 if(param.asInt() == 1)
 {
digitalWrite(2, LOW);digitalWrite(3, LOW);digitalWrite(4, HIGH); delay(2000);
digitalWrite(2, LOW);digitalWrite(3, HIGH);digitalWrite(4, LOW); delay(2000);
digitalWrite(2, HIGH);digitalWrite(3, LOW);digitalWrite(4, LOW); delay(2000);
  }
else 
 {
digitalWrite(2, LOW);digitalWrite(3, LOW);digitalWrite(4, LOW); 
  }
 }

[daveblynk]

We gave you some instructions on your other topic. Please dnt keep creating new topics. @PeteKnight ??

[PeteKnight]

Topics merged, thanks for flagging this Dave.

@rameshpersuader as @daveblynk said, please don’t keep creating new topics about the same issue.
I’d suggest that you read the documentation for SimpleTimer - which BlynkTimer is based on - and read the topics on this forum regarding BlynkTimer in Timeout mode.
You probably won’t want to use the Timeout timer in a Lambda function in t5his case, as for what you want, you’d need nested Lamda functions, high becomes a bit complex.

Start_Timer_A()
{
  turn LED 1 ON  
  initialise timeout timer A, to call Timer_A_Ends() when it completes
}

Timer_A_Ends()
{
  turn LED 1 OFF
  call Start_Timer_B
}


Start_TimerB()
{
  turn LED 2 ON  
  initialise timeout timer B, to call Timer_B_Ends() when it completes
}

Timer_B_Ends()
{
  turn LED 2 OFF
  call Start_Timer_C
}


Start_Timer_C()
{
  turn LED 3 ON  
  initialise timeout timer C, to call Timer_C_Ends() when it completes
}

Timer_C_Ends()
{
  turn LED 3 OFF
  call Start_Timer_A (assuming you want this process to cycle repeatedly
}

Pete.

[rameshpersuader]

Hello Pete,
Can you please tell what am I doing wrong? The code is not working and also throwing error while compilation. Please help. I know this is too dumb as I’m unable to blink 3 LED’s.

// You could use a spare Hardware Serial on boards that have it (like Mega)
#include <SoftwareSerial.h>
SoftwareSerial DebugSerial(2, 3); // RX, TX

#include <BlynkSimpleStream.h>
#include <SimpleTimer.h>

SimpleTimer timer;

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "bMLxyWbo3wv-gMZ9YS";

const int Green=2;
const int Orange=3;
const int Red=4;

void setup() 
{
pinMode(2, OUTPUT); 
pinMode(3, OUTPUT); 
pinMode(4, OUTPUT); 

  Serial.begin(9600);
  Blynk.begin(Serial, auth);
  timer.enable(timerId);
}



void loop() 
{


  Blynk.run();
  timer.run();
  

  
  timerId = timer.setTimeout(1000, Green_On);
  timerId = timer.setTimeout(1000, Orange_On);
  timerId = timer.setTimeout(1000, Red_On);
 
}

void Red_On()  
{
digitalWrite(Green, LOW);digitalWrite(Orange, LOW);digitalWrite(Red, HIGH); 
}

void Orange_On()  
{
digitalWrite(Green, LOW);digitalWrite(Orange, HIGH);digitalWrite(Red, LOW); 
}

void Green_On()  
{
digitalWrite(Green, HIGH);digitalWrite(Orange, LOW);digitalWrite(Red, LOW); 
}

[PeteKnight]

I think you need to re-read what I wrote, and take that stuff out of your vid loop.

Pete.