Blynk to multiple Arduino device

Solved
1

Hi,
I am trying to connect two Arduino UNO board with same Auth No for data sharing,
but only data transfer is possible from Blynk App to both devices.
i need to transfer data from one Arduino to other using virtual register is this Possible?

2

In actuality, it is the server that does all the ā€˜sharingā€™ of vPin data, the App is just a control and display interface.

There have been a few topics similar to thisā€¦ you will need to do some creative keyword searching and a bit of reading as I canā€™t think of any titles off the top of head.

But one option is to use separate auths for each device, then you can use Bridge for data ā€œtransferā€.

Or Device Selector might also work for your needs.

One option I recall, using same auth for multiple devices, was to have dedicated vPins for each deviceā€¦ well they all had access to all vPins for ā€˜readingā€™ but each used specific vPins to ā€˜Writeā€™ toā€¦ If I recall correctly. Shouldnā€™t need to have any actual widgets associated with the vPins as the server retains all that infoā€¦ just write data to a vPin from one device and keep scanning for updated data on same vPin on another device.

3

Thank you Gunner,
for verry Soon Reply
suggested link is valuable.
I think using this my task will complete soon. Thank you

4

hi Gunner,
i diid the setting and got success with device on off from one device to another.
thank you for your suggestion.

1 Like
5

What method did you use?

7

I USE ONE ARDUINO UNO WITHled and blynk app interface, OTHER ARDUINO BOARD WITH LED INTERFACED
AUTH NO is different of both the device.
the code is given below
for Board 1:

#define BLYNK_PRINT DebugSerial
// 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>
int Countdown;
char auth[] = ā€œAuth no 1ā€;
WidgetBridge bridge1(V0); // Bridge widget on virtual pin 0
BlynkTimer timer; // Timer for blynking
static bool value = true;
void blynkAnotherDevice() // Here we will send HIGH or LOW once per second
{
if (value) {
bridge1.digitalWrite(9, HIGH); // Digital Pin 9 on the second board will be set HIGH
bridge1.virtualWrite(V5, 1); // Sends 1 value to BLYNK_WRITE(V5) handler on receiving side.
} else {
bridge1.digitalWrite(9, LOW); // Digital Pin 9 on the second board will be set LOW
bridge1.virtualWrite(V5, 0); // Sends 0 value to BLYNK_WRITE(V5) handler on receiving side.
}
}

BLYNK_CONNECTED() {
bridge1.setAuthToken(ā€œAuth no of second Boardā€); // Place the AuthToken of the second hardware here
}

BLYNK_WRITE(V1)
{
Countdown = param.asInt();
}
void setup()
{
// Debug console
DebugSerial.begin(9600);
pinMode(13, OUTPUT);
// Blynk will work through Serial
// Do not read or write this serial manually in your sketch
Serial.begin(9600);
Blynk.begin(Serial, auth);
timer.setInterval(1000L, blynkAnotherDevice);
}

void loop()
{

Blynk.run();
timer.run();
if(Countdown>100)
{
digitalWrite(13, HIGH);
Blynk.virtualWrite(0,1023);
value= true;
}
else
{
digitalWrite(13, LOW);
Blynk.virtualWrite(0,0);
value=false;
}
}

CODE FOR BOARD 2:

#define BLYNK_PRINT DebugSerial
// 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>

// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
int Countdown1;
char auth[] = ā€œAuth No 2ā€;
BLYNK_CONNECTED(){
Blynk.syncVirtual(V0);
}
BLYNK_WRITE(V5)
{
Countdown1 = param.asInt();
}
void setup()
{
// Debug console
DebugSerial.begin(9600);
pinMode(13, OUTPUT);
// Blynk will work through Serial
// Do not read or write this serial manually in your sketch
Serial.begin(9600);
Blynk.begin(Serial, auth);
}

void loop()
{

Blynk.run();
if(Countdown1==1)
{
digitalWrite(13, HIGH);
}
else
{
digitalWrite(13, LOW);
}
}

create Blynk app
unable to send app image
but by using code u can understand very well

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