+ b = ( (digitalRead(AJAR_PIN) == LOW)? SHUT : AJAR );
+ ajar_low_pass_counter = ( (b == ajar_low_pass_last_value)? ajar_low_pass_counter + 1 : 0 );
+ ajar_low_pass_last_value = b;
+ if (ajar_low_pass_counter >= AJAR_LOW_PASS_TAU)
+ {
+ ajar_low_pass_counter = 0;
+ return b;
+ }
+ else
+ return ajar_last_state;