diff --git a/src/timer.c b/src/timer.c
index b91619a..c04ad11 100644
--- a/src/timer.c
+++ b/src/timer.c
@@ -1,6 +1,9 @@
 #include <avr/io.h>
 #include <avr/interrupt.h>
 
+#include <math.h>
+#include <stdio.h>
+
 #include "include/timer.h"
 
 void initCtcTimer0(void)
@@ -11,7 +14,7 @@ void initCtcTimer0(void)
 	/* Enable Counter0 Compare Match A Interrupt */
 	TIMSK0 |= (1 << OCIE0A);
 	
-	/* Select clock. Prescaler of 8 */
+	/* Select clock. Prescaler of 1024 */
 	TCCR0B |= (1 << CS02) | (1 << CS00);
 	
 	/* Use CTC Mode */
@@ -20,7 +23,7 @@ void initCtcTimer0(void)
 	/* 
 	 * OCR0A contains TOP value for counter:
 	 */
-	OCR0A = 100;
+	OCR0A = 255;
 }
 
 void initOverflowTimer0(void)
@@ -38,7 +41,15 @@ void initOverflowTimer1(void)
 	TIMSK1 |= (1<<TOIE1);
 }
 
+volatile double sin_op = 0.0;
+volatile uint8_t wait_cnt = 0;
+
 ISR(TIMER0_COMPA_vect)
 {
-	PORTB |= (1 << PB2);
+	if (wait_cnt > 0) {
+		printf("%.2lf\n\r", sin(sin_op));
+		sin_op = ((sin_op + 0.01) > 2*M_PI) ?  0.0 : sin_op + .01;
+		wait_cnt = 0;
+	}
+	wait_cnt++;
 }