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Thanks. I heard that bad crystal may cause the time goes slowly. Time goes correctly . The only issue is the display works slowly. So I got the snapshot above when "digits" in the menu was appearing.I also tried to move "ht1632c routine" to another project without "DS1307" routine to test the display. I just put the simple "hello" using "ht1632c_puttinychar()" without delay() in .ino. The word still appeared column by column, in an observable speed of naked eyes.