ABSTRACT
With the fast development of society, computers have been widely used in our
normal life and study. While we enjoy the convenience in information and fun, we
can't ignore the problems, such as the cervical vertebra disease, myopia, a series of
disease for the long time use of computers. Thus, the alarm for the near distance
between computer and user, which is used to improve this situation is proposed in this
context.
The design is in the core of STC89C52 Single chip microcomputer, measures
people’s distance through the up, middle, down three HC-SR04 ultrasonic wave parts
which are installed on the computer display, according to the records, it'll know the
people's position, judge whether the distance that's between user and computer is too
close, the gesture is right or not, then prompt user to correct gesture through alarm,
it'll judge whether the environmental temperature is normal, in order to apply user the
reference temperature through the DS18B20 temperature sensor to get the actual ones,
the computer’s use time will be recorded to suggest users to get relaxed, the friendly
human computer interaction interface which consist of independence keyboard and
the LCD1602 can be easily used, too. After debugging, it was tested that the design
has accomplished the whole functions, and it's innovative and valuable.
According to the analyze of the application, it comes into being the design
scheme of the system in the beginning, then gives the detail description from
hardware and software both sides, finally gets the verification of the system function
through the system debugging and analyze.
KEY WORDS: microcontroller, ultrasonic, ranging, correct posture
