diff --git a/platformio.ini b/platformio.ini
index d4cc62f..36262ea 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -14,7 +14,7 @@ board = az-delivery-devkit-v4
 framework = arduino
 monitor_port = COM[13]
 monitor_speed = 115200
-
 lib_deps = 
 	evert-arias/EasyBuzzer@^1.0.4
 	lbernstone/Tone32@^1.0.0
+	lennarthennigs/Button2@^1.2.0
diff --git a/src/main.cpp b/src/main.cpp
index 628604c..3c3c7e9 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,5 +1,6 @@
 #include <Tone32.h>
 #include <NeoPixelBus.h>
+#include "Button2.h"
 
 #define BUZZER_PIN 5
 #define BUZZER_CHANNEL 0
@@ -9,7 +10,6 @@ const uint8_t DotDataPin = 14;
 
 #define colorSaturation 128
 #define MAX_ITER 2000000
-#define IMPULS 400 //400 ms impuls minimal
 // for software bit bang
 NeoPixelBus<NeoGrbFeature, Neo800KbpsMethod> strip(PixelCount, DotDataPin);
 // for hardware SPI (best performance but must use hardware pins)
@@ -58,17 +58,19 @@ static RgbColor LEDoffColor;
 
 RgbColor rgbArray[] = {red, blue, green, white};
 
-const byte interruptPin = 17;
-volatile int interruptCounter = 0;
-int numberOfInterrupts = 0;
+#define BELL_PIN 12 // Pin 12 as default
+#define MINIMAL_GAP 30*1000 // 30 seconds between rings
+#define IMPULS 500 // minimal press of button
 
-unsigned long one,zero;
+const byte interruptPin = 17;
+
+unsigned long last_low = 0; // time of uptime
+unsigned long last_high = 0;
+unsigned long last_sended = 0;
 bool run;
 
 TaskHandle_t Task1;
-
-
-portMUX_TYPE mux = portMUX_INITIALIZER_UNLOCKED;
+Button2 buttonBELL = Button2(17,INPUT_PULLDOWN,false,100U);
 
 void LCD_snake()
 {
@@ -122,16 +124,32 @@ void beep(void * pvParameters) {
     delay(100);
   }
 }
- 
-void IRAM_ATTR handleInterrupt() {
 
-  portENTER_CRITICAL_ISR(&mux);
+void change(Button2& btn) {
+  Serial.println("CHANGE");
+  if (btn.isPressed()) {
+    unsigned long pressed = millis() - last_high;
 
-  if (digitalRead(interruptPin) == HIGH) one = millis();
-  if (digitalRead(interruptPin) == LOW) zero = millis();
-  
-  interruptCounter++;
-  portEXIT_CRITICAL_ISR(&mux);
+    if (last_high == 0) return;
+
+    Serial.print("released: ");
+    Serial.println(pressed);
+
+    if (pressed < IMPULS) {
+      Serial.println("Interval too low");
+      return;
+    }
+
+    if (millis() - last_sended < MINIMAL_GAP) {
+      Serial.println("Minimal gap not meeted");
+      return;
+    }
+
+    run = true;
+    last_sended = millis();
+  } else {
+    last_high = millis();
+  }
 }
 
 void setup() {
@@ -143,11 +161,8 @@ void setup() {
   strip.ClearTo(black);
   strip.Show();
 
-  one = zero = millis();
-
-  Serial.println("Monitoring interrupts: ");
-  pinMode(interruptPin, INPUT_PULLUP);
-  attachInterrupt(digitalPinToInterrupt(interruptPin), handleInterrupt, CHANGE);
+  Serial.println("Monitoring:");
+  buttonBELL.setChangedHandler(change);
   
   xTaskCreatePinnedToCore(
              beep, /* Task function. */
@@ -162,21 +177,7 @@ void setup() {
 
 void loop() {
 
-  if(interruptCounter>0){
- 
-      portENTER_CRITICAL(&mux);
-      interruptCounter--;
-      portEXIT_CRITICAL(&mux);
- 
-      numberOfInterrupts++;
-      Serial.print("An interrupt has occurred. Total: ");
-      Serial.println(numberOfInterrupts);
+  buttonBELL.loop();
       
-      if (zero > one && zero - one > IMPULS) run = true;
-      else run = false;
-      
-      if (run) LCD_snake();
-      
-  }
-  delay(100);
+  if (run) LCD_snake();
 }
\ No newline at end of file