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@vshymanskyy @doom369
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Download latest Blynk library here:
Blynk is a platform with iOS and Android apps to control
Arduino, Raspberry Pi and the likes over the Internet.
You can easily build graphic interfaces for all your
projects by simply dragging and dropping widgets.
Downloads, docs, tutorials:
Sketch generator:
Blynk community:
Follow us:
Blynk library is licensed under MIT license
This example code is in public domain.
Blynk can provide your device with time data, like an RTC.
Please note that the accuracy of this method is up to several seconds.
App project setup:
RTC widget (no pin required)
Value Display widget on V1
Value Display widget on V2
For this example you'll need Time keeping library:
This code is based on an example from the Time library:
/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial
#include <SPI.h>
#include <Ethernet.h>
#include <BlynkSimpleEthernet.h>
#include <TimeLib.h>
#include <WidgetRTC.h>
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "YourAuthToken";
BlynkTimer timer;
WidgetRTC rtc;
// Digital clock display of the time
void clockDisplay()
// You can call hour(), minute(), ... at any time
// Please see Time library examples for details
String currentTime = String(hour()) + ":" + minute() + ":" + second();
String currentDate = String(day()) + " " + month() + " " + year();
Serial.print("Current time: ");
Serial.print(" ");
// Send time to the App
Blynk.virtualWrite(V1, currentTime);
// Send date to the App
Blynk.virtualWrite(V2, currentDate);
// Synchronize time on connection
void setup()
// Debug console
// Other Time library functions can be used, like:
// timeStatus(), setSyncInterval(interval)...
// Read more:
setSyncInterval(10 * 60); // Sync interval in seconds (10 minutes)
// Display digital clock every 10 seconds
timer.setInterval(10000L, clockDisplay);
void loop()
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