Just use an Arduino Board to make a RFID 125K card reader , it has a uart serial output and can display the card ID in a LCD . And use more pins , the card reader can control the buzzer,LED or a relay directly.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001248s ]
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:0.095012s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001409s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001908s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001377s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004476s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001386s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003215s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015057s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001418s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 215626 [ RunTime:0.001415s ]
