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arduino-cli/libraries/Blynk/examples/Widgets/LED/LED_StatusOfButton/LED_StatusOfButton.ino

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+/*************************************************************
+  Download latest Blynk library here:
+    https://github.com/blynkkk/blynk-library/releases/latest
+
+  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: http://www.blynk.cc
+    Sketch generator:           http://examples.blynk.cc
+    Blynk community:            http://community.blynk.cc
+    Follow us:                  http://www.fb.com/blynkapp
+                                http://twitter.com/blynk_app
+
+  Blynk library is licensed under MIT license
+  This example code is in public domain.
+
+ *************************************************************
+
+  Blynk using a LED widget on your phone!
+
+  App project setup:
+    LED widget on V3
+ *************************************************************/
+
+/* Comment this out to disable prints and save space */
+#define BLYNK_PRINT Serial
+
+
+#include <SPI.h>
+#include <Ethernet.h>
+#include <BlynkSimpleEthernet.h>
+
+// You should get Auth Token in the Blynk App.
+// Go to the Project Settings (nut icon).
+char auth[] = "YourAuthToken";
+
+// Select your pin with physical button
+const int btnPin = 1;
+
+WidgetLED led3(V3);
+
+BlynkTimer timer;
+
+// V3 LED Widget represents the physical button state
+boolean btnState = false;
+void buttonLedWidget()
+{
+  // Read button
+  boolean isPressed = (digitalRead(btnPin) == LOW);
+
+  // If state has changed...
+  if (isPressed != btnState) {
+    if (isPressed) {
+      led3.on();
+    } else {
+      led3.off();
+    }
+    btnState = isPressed;
+  }
+}
+
+void setup()
+{
+  // Debug console
+  Serial.begin(9600);
+
+  Blynk.begin(auth);
+
+  // Setup physical button pin (active low)
+  pinMode(btnPin, INPUT_PULLUP);
+
+  timer.setInterval(500L, buttonLedWidget);
+}
+
+void loop()
+{
+  Blynk.run();
+  timer.run();
+}
+