When system detect the OPEN & CLOSE signal correctly, the COOK &
COUNTDOWN RING will appear to show the cooking is started.
As the whole ring represent the whole cooking time, it will disappear the
segment one by one in clockwise direction, the segment will firstly flash and
then disappear finally one by one.
The ring will count down until all segments disappeared.
When finished the cooking, COOK will disappear, then READY will come
back to notice user the cooking is finished and beep THREE times.
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