diff --git a/application.c b/application.c
index 0078cd7..33fb5c4 100644
--- a/application.c
+++ b/application.c
@@ -803,7 +803,15 @@ void main(void)
 	rcc_periph_clock_enable(GPIO_RCC(CONTROL_POWER_RED_LED_PIN)); // enable clock for GPIO port peripheral
 	gpio_clear(GPIO_PORT(CONTROL_POWER_RED_LED_PIN), GPIO_PIN(CONTROL_POWER_RED_LED_PIN)); // switch LED off
 	gpio_set_mode(GPIO_PORT(CONTROL_POWER_RED_LED_PIN), GPIO_MODE_OUTPUT_2_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO_PIN(CONTROL_POWER_RED_LED_PIN)); // set pin as output push-pull to be able to power LED
-	// play/pause button is configured by global
+	// play/pause button
+	rcc_periph_clock_enable(GPIO_RCC(CONTROL_PLAY_BUTTON_LED_PIN)); // enable clock for button
+	gpio_set_mode(GPIO_PORT(CONTROL_PLAY_BUTTON_LED_PIN), GPIO_MODE_INPUT, GPIO_CNF_INPUT_PULL_UPDOWN, GPIO_PIN(CONTROL_PLAY_BUTTON_LED_PIN)); // set button pin to input
+	rcc_periph_clock_enable(RCC_AFIO); // enable alternate function clock for external interrupt
+	exti_select_source(GPIO_EXTI(CONTROL_PLAY_BUTTON_LED_PIN), GPIO_PORT(CONTROL_PLAY_BUTTON_LED_PIN)); // mask external interrupt of this pin only for this port
+	gpio_set(GPIO_PORT(CONTROL_PLAY_BUTTON_LED_PIN), GPIO_PIN(CONTROL_PLAY_BUTTON_LED_PIN)); // pull up to be able to detect button push (go low)
+	exti_set_trigger(GPIO_EXTI(CONTROL_PLAY_BUTTON_LED_PIN), EXTI_TRIGGER_FALLING); // trigger when button is pressed
+	exti_enable_request(GPIO_EXTI(CONTROL_PLAY_BUTTON_LED_PIN)); // enable external interrupt
+	nvic_enable_irq(GPIO_NVIC_EXTI_IRQ(CONTROL_PLAY_BUTTON_LED_PIN)); // enable interrupt
 	puts("OK\n");
 
 	puts("setup heating bed pins: ");
@@ -987,11 +995,7 @@ void main(void)
 		if (button_flag) { // user pressed button
 			action = true; // action has been performed
 			sleep_ms(100); // wait a bit to remove noise
-#if (0 == BUTTON_PRESSED)
-			if (!gpio_get(GPIO_PORT(BUTTON_PIN), GPIO_PIN(BUTTON_PIN))) {
-#else
-			if (gpio_get(GPIO_PORT(BUTTON_PIN), GPIO_PIN(BUTTON_PIN))) {
-#endif
+			if (!gpio_get(GPIO_PORT(CONTROL_PLAY_BUTTON_LED_PIN), GPIO_PIN(CONTROL_PLAY_BUTTON_LED_PIN))) {
 				puts("button pressed\n");
 				gpio_toggle(GPIO_PORT(CONTROL_PLAY_ORANGE_LED_PIN), GPIO_PIN(CONTROL_PLAY_ORANGE_LED_PIN));
 				gpio_toggle(GPIO_PORT(CONTROL_PLAY_GREEN_LED_PIN), GPIO_PIN(CONTROL_PLAY_GREEN_LED_PIN));
@@ -1098,3 +1102,10 @@ void rtc_isr(void)
 		tick = RTC_TICKS_SECOND; // reset count down
 	}
 }
+
+/** interrupt service routine called when button is pressed */
+void GPIO_EXTI_ISR(CONTROL_PLAY_BUTTON_LED_PIN)(void)
+{
+	exti_reset_request(GPIO_EXTI(CONTROL_PLAY_BUTTON_LED_PIN)); // reset interrupt
+	button_flag = true; // perform button action
+}