单片机控制键盘和led，键盘送入的数据在led 上显示，数据满四位后，键入的第5位数据在个位显示，前四位清零。-MCU control the keyboard and led, keyboard into the data led the show, data-4, Type the first five places in the data revealed that four former reset.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001085s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.065712s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000970s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001257s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001086s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003091s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000915s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003924s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.020476s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001206s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 140881 [ RunTime:0.014720s ]
