diff --git a/src/main.c b/src/main.c
index a3d3e93..407e4f5 100644
--- a/src/main.c
+++ b/src/main.c
@@ -126,25 +126,33 @@ int main() {
 
 
 
+  // seconds
   TCCR2 = 0b00000101;
   ASSR |= (1 << AS2);
   TIMSK |= (1 << TOIE2) | (1 << TICIE1);
 
+  // signal measurment
   TCCR1A = 0;
   TCCR1B = (1 << CS12) | (1 << CS10);
 
   DDRD &= ~(1 << PD2);
   DDRD &= ~(1 << PD3);
   PORTD |= (1 << PD2) | (1 << PD3);
+  MCUCR |= (1 << ISC11) | (1 << ISC10) | (1 << ISC01);
+  GICR |= (1 << INT0) | (1 << INT1);
 
+  // esd prot
   DDRD |= (1 << PD5) | (1 << PD6);
 
+  // valid led
   DDRB |= (1 << PB0);
   TCCR0 = (1 << CS02) | (1 << CS00);
   TIMSK |= (1 << TOIE0);
 
-  MCUCR |= (1 << ISC11) | (1 << ISC10) | (1 << ISC01);
-  GICR |= (1 << INT0) | (1 << INT1);
+  // position switches
+  DDRB &= ~(1 << PB1);
+  DDRB &= ~(1 << PB2);
+  PORTB |= (1 << PB1) | (1 << PB2);
 
 
   sei();
@@ -487,6 +495,13 @@ int main() {
     }
 
 
+    static uint8_t oldPositionSwitch = 255;
+    uint8_t positionSwitch = PINB & ((1 << PB1) | (1 << PB2));
+    if (oldPositionSwitch != positionSwitch) {
+      oldPositionSwitch = positionSwitch;
+      printf("POS: %02d\n", positionSwitch);
+    }
+
     if (tack != 0) {
       tack = 0;
       switch (valid) {