MEASURING INSTRUMENT FOR HUMIDITY BASEED ON
AT89S52MICROCONTROLLER
ABSTRACT
With the development of society, people on the environment of temperature and
humidity requirements are also increasing, especially in the medical, electronic power,
aerospace, food fermentation, such as temperature and humidity in the field of the harsh
demands in particular, in view of such a design that Can be precise, stable, real-time
measurement of temperature and humidity environment to the practical temperature and
humidity detector it is particularly important.
The temperature and humidity detector is AT89S52 as the core chip, the
microcontroller has a very good anti-disturbance capacity, fast response. Based on this
MCU temperature and humidity detector can be real-time, accurate measurement of
environmental temperature and relative humidity.
The detector part of the design of the hardware used to with
AT89S52microcontroller as the core of the control devices, with high sensitivity
AD0809 colect humidity resistance change then through the MCU handle data
acquisition components for humidity.AT89S52 direct control the DS18B20 obtain now
temperature.The device add an alarm,it can set range.if temprature and humidity over
limit it will alarming. Analog input keyboard to achieve human-computer interface
exchange function and used as an LCD display hardware design. The software part is
divided into several parts, and then each module design process, with C language to
achieve, to combine the various parts of coordination, and eventually realize the
environmental temperature and humidity in the real-time detection.
The temperature and humidity detector can basically complete the temperature
and humidity testing, but because of personal factors such as lack of experience, the
design of some deficiencies, there are certain practical products from the gap, there are
some aspects need to be improved.
KEYWORDS:AT89S52MCU,A/Dconversion, Sensor, LCD, Temperature and
humidity
