diff --git a/C_C++/int.ino b/C_C++/int.ino
new file mode 100644
index 0000000..09dcb3d
--- /dev/null
+++ b/C_C++/int.ino
@@ -0,0 +1,57 @@
+#define INPUT_PORT 2
+
+#define OK_LED 3
+#define PANIC_LED1 4
+#define PANIC_LED2 5
+
+int switchState = 0;
+
+void boot() {
+	const int BOOT_TIME = 3000;
+	const int UNIT = 250;
+
+	digitalWrite(OK_LED, LOW);
+
+	for (int i = 0; i < BOOT_TIME; i++) {
+		digitalWrite(PANIC_LED1, HIGH);
+		digitalWrite(PANIC_LED2, LOW);
+		delay(UNIT);
+		i += UNIT;
+
+		digitalWrite(PANIC_LED1, LOW);
+		digitalWrite(PANIC_LED2, HIGH);
+		delay(UNIT);
+		i += UNIT;
+	}
+}
+
+void setup() {
+	pinMode(INPUT_PORT,INPUT);
+
+ 	pinMode(OK_LED, OUTPUT);
+	pinMode(PANIC_LED1, OUTPUT);
+	pinMode(PANIC_LED2, OUTPUT);
+
+	boot();
+}
+
+void loop() {
+ 	switchState = digitalRead(INPUT_PORT);
+	
+	if (switchState == LOW) {
+		// the button is not pressed
+		digitalWrite(OK_LED, HIGH);
+		digitalWrite(PANIC_LED1, LOW);
+		digitalWrite(PANIC_LED2, LOW);
+ 	} else { // the button is pressed
+		digitalWrite(OK_LED, LOW);
+		digitalWrite(PANIC_LED1, LOW);
+		digitalWrite(PANIC_LED2, HIGH);
+		delay(250);
+		
+		// toggle the LEDs
+		digitalWrite(PANIC_LED1, HIGH);
+		digitalWrite(PANIC_LED2, LOW);
+		delay(250);
+	}
+}