diff --git a/main.c b/main.c
index 3f0d217..70e0f15 100644
--- a/main.c
+++ b/main.c
@@ -6,32 +6,43 @@
 #include <stdbool.h>
 #include <avr/interrupt.h>
 
-int tick_timer_start =  0xffff - (F_CPU / 1024); // 1 second
+volatile int debounce_int2 = 10;
+volatile int debounce_int3 = 10;
 
-void start_timer() {
-    TCCR1B |= _BV(CS10) | _BV(CS12); // clk/1024
-
-    // Set the TOIE (Timer Overflow Interrupt Enable) bit
-    // on TIMSK1 (Timer 1 Interrupt Mask Register).
-    TIMSK1 |= _BV(TOIE1);
-
-    // Sets the current timer value
-    TCNT1 = tick_timer_start;
-
-    // Enable interrupts
-    sei();
+ISR(INT2_vect) {
+    if (debounce_int2) return;
+    debounce_int2 = 100;
+    OCR0A++;
 }
 
-// ISR is used to handle interrupts. TIMER1_OVF_vect
-// is triggered whenever timer 1 (16 bit) overflows.
-ISR(TIMER1_OVF_vect) {
-    TCNT1 = tick_timer_start;
-    PORTB ^= 0b10000000;
+ISR(INT3_vect) {
+    if (debounce_int3) return;
+    debounce_int3 = 100;
+    OCR0A--;
+}
+
+ISR(TIMER0_COMPA_vect) {
+    PORTF ^= 0b00000001;
 }
 
 void main() {
-    DDRB = 0b10000000;
+    DDRF = 0b00000001;
+    DDRD = 0b00000000;
+    PORTD |= 0b00001100;
 
-    start_timer();
-    while(1);
+    // EIMSK controls which ports can trigger interrupts
+    EIMSK |= _BV(INT2) | _BV(INT3);
+    // Trigger on falling edge on INT2 and INT3
+    EICRA |= _BV(ISC21) | _BV(ISC31);
+
+    TCCR0B |= _BV(CS00) | _BV(CS02); // clk/1024
+    TIMSK0 |= _BV(OCIE0A);
+    OCR0A = 0;
+
+    sei();
+
+    while(1) {
+        _delay_ms(10);
+        OCR0A++;
+    }
 }