diff --git a/examples/interrupt/main.c b/examples/interrupt/main.c
new file mode 100644
index 0000000..e36404e
--- /dev/null
+++ b/examples/interrupt/main.c
@@ -0,0 +1,207 @@
+#include "main.h"
+#include "delay.h"
+#include "deviceSetup.h"
+#include "usart.h"
+#include "ascii.h"
+#include "timer.h"
+#include "i2c.h"
+#include "pin.h"
+
+#include "stm32f042x6.h"
+#include "hardwareDescription.h"
+
+volatile uint8_t led_on;
+
+void setup();
+#if 0
+void EXTI0_1_IRQHandler(void)
+{
+	if(EXTI->PR & EXTI_PR_PIF1) {
+		// clear flag
+		EXTI->PR |= EXTI_PR_PIF1;
+		led_on = !led_on;
+	}
+}
+
+void risingEdgeInterruptPinA1()
+{
+
+	// https://controllerstech.com/external-interrupt-using-registers/
+		
+	pinConfig(pinA1, input, def_stage, pullDown, def_speed);
+
+	// Connect
+	RCC->APB2ENR |= RCC_APB2ENR_SYSCFGEN;
+	SYSCFG->EXTICR[1] &= ~SYSCFG_EXTICR1_EXTI1_Msk;
+	SYSCFG->EXTICR[1] |= SYSCFG_EXTICR1_EXTI1_PA;
+
+	// Interrupt mask register
+	EXTI->IMR |= EXTI_IMR_IM1;
+	
+	// rising trigger selection
+	EXTI->RTSR |= EXTI_RTSR_RT1;
+	
+	NVIC_SetPriority (EXTI0_1_IRQn, 0);	
+	NVIC_EnableIRQ(EXTI0_1_IRQn);	
+
+	while(1)
+	{
+		if(led_on){
+			pinWrite(pinB3,1);
+		} else{
+			pinWrite(pinB3,0);
+		}
+	}
+}
+#endif
+
+void TIM2_IRQHandler(){
+    /* Check what type of event occurred */
+    if (TIM2->SR & TIM_SR_UIF)
+    {
+        /* Clear the interrupt even flag. CPU will only respond to new flags thereafter */
+        TIM2->SR &= ~TIM_SR_UIF;
+		pinToggle(pinB3);
+	}
+}
+
+
+void LEDtoggleOnTimer2underflow()
+{
+	/*
+	//timerInitCounter(timer_2, 0xFFFF, 0, upCounting);
+	
+	// reset timer 2 periperal
+	RCC->APB1RSTR |= RCC_APB1RSTR_TIM2RST;
+	
+	//while(RCC->APB1RSTR & RCC_APB1RSTR_TIM2RST);
+
+	// enable timer 2 peripheral
+	RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;
+
+	// only allow under-/overflow interrupts
+	TIM2->CR1 |= TIM_CR1_URS;
+
+	// set to count down mode
+	TIM2->CR1 |= TIM_CR1_DIR;
+
+	// set clock prescaler	
+	TIM2->PSC = 0xFFFF;
+
+	// set outo reload value	
+	TIM2->ARR = 0xFFFFFFFF;
+	
+	//TIM2->EGR |= TIM_EGR_UG;
+
+	// Enable Update Interrupt
+	TIM2->DIER |= TIM_DIER_UIE;	
+
+	// reset status register
+	TIM2->SR = 0;
+
+	//NVIC_SetVector(TIM2_IRQn, (uint32_t)&TIM2_IRQHandler);
+	NVIC_SetPriority(TIM2_IRQn,3);
+	NVIC_EnableIRQ(TIM2_IRQn);
+
+	// timer enable	
+	TIM2->CR1 |= TIM_CR1_CEN;
+
+	//timerSart(timer_2);
+
+	while(1)
+	{
+		if(TIM2->CNT > 0xFFFF) {
+			pinWrite(pinB3,1);
+		} else {
+			pinWrite(pinB3,0);
+		}
+		
+		if(led_on){
+			pinWrite(pinB3,1);
+		} else{
+			pinWrite(pinB3,0);
+		}
+		
+	}
+	*/
+#if 0
+	// example based on
+	// https://alsaibie.github.io/me319/prelabsextra/lab4extra/
+	/* Enable Timer 2 peripheral */
+	RCC->APB1ENR |= RCC_APB1ENR_TIM2EN;
+	/* Default APB1 speed is 16MHz. Scale Timer 2 to 20kHz */
+	//TIM2->PSC = (uint32_t)(16E6 / 20E3) - 1;
+	TIM2->PSC = (8E6 / 20E3) - 1 ;
+	/* Disable Timer*/
+	TIM2->CR1 = 0;
+	/* Reinitialize counter and update registers */
+	TIM2->EGR = TIM_EGR_UG;
+	/* 1000 Counts at 20kHz => 20Hz IRQ */
+	//TIM2->ARR = 1000 - 1;
+	TIM2->ARR = 10000-1;
+	/* Enable hardware interrupts */
+	TIM2->DIER |= TIM_DIER_UIE;
+	/* Start Timer */
+	TIM2->CR1 |= TIM_CR1_CEN;
+#endif
+
+	timerInitCounter(timer_2,(8E6/20E3)-1,10000-1,upCounting);
+
+	//TIM2->EGR = TIM_EGR_UG;
+	TIM2->DIER = TIM_DIER_UIE;
+
+	timerSart(timer_2);
+	
+	NVIC_SetPriority(TIM2_IRQn, 2);
+	NVIC_EnableIRQ(TIM2_IRQn);
+	
+	while(1)
+	{
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	setup();
+
+	LEDtoggleOnTimer2underflow();
+	while(1);
+
+	return 1;
+}
+
+void setup()
+{
+	uint8_t i = 0;
+
+	delayInitMs(8000000, 1000); // Clock Freq and Divider for ARM library 
+	
+	pinConfig(pinB3, output, pushPull, def_res, def_speed);
+	pinConfig(pinA0, input, def_stage, pullDown, def_speed);	
+	
+	setupInit(); // This is the sescond call of System init the assebly start code is calling it before the main.	
+	
+	usartInit(	usart2, 
+				pinA2, 
+				pinA15,
+				115200,
+				eight, 
+				NO_PARITY_CTRL,
+				noFlowControl); 
+
+	//clears screen and send the wellcome messgae
+	print_Usart(usart2, ASCII_clear); 
+	print_Usart(usart2, "Hello to our KED project\n\r"); 
+	
+
+	//blinks 10 times to indicate the sicsessfull init if the device
+	for(i = 0 ; i < 10 ; i++) {
+		delayMs(100); 
+		pinToggle(pinB3);
+		delayMs(100); 
+	}
+
+	pinWrite(pinB3,0);
+}
+
+