Arduino TollGate with ultrasonic & rfid & servo

hello guys.

im doing project school , started doing arduino smart tollgate. i'v been doing fine far until got stuck in while loop. want ultrasonic sensor protect car toll. great thanks.

i assume while loop stuck in one:

code: [select]

        while ( distance < 4){
         
           delay(500);
         
        }

if loop entered value of distance never changes , yes, stuck in it.  there block of code @ beginning of loop() sets value of distance, need include in while loop, it's chance you'll have of getting out of it.

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