more reliable shutdown

scripts/esc-button.py

 
 pressed = False
 
-shutdown = 3 * 10
-iterations = 0
+shutdown = 2.5
+press_start = time.time()
 
 while True:
     current = not GPIO.input(3)
     if current and not pressed:
         call(["xdotool", "keydown", "Escape"])
         pressed = True
+        press_start = time.time()
     elif not current and pressed:
         call(["xdotool", "keyup", "Escape"])
         pressed = False
-        iterations = 0
 
     if current:
-        iterations += 1
-        if iterations > shutdown:
+        if time.time() - shutdown >= press_start:
             call(["sudo", "shutdown", "-h", "now"])
 
     time.sleep(0.1)