Abstract
The research projects is to provide people an instruments with a
real-time information about the quality of the environment ,
including temperature, humidity, light intensity, so that people can
be informed in a timely manner and make appropriate adjustments.
In this paper, as a control STC89C52 microcontroller core to
achieve the design of the right temperature and humidity testing,
light intensity detection circuit and LCD display real-time hardware
and so on. The realization of its functions mainly through software
programming to complete, which not only reduces the hardware circuit
complexity and its cost, but also to complex hardware circuits
difficult to achieve the task.Using of new low-power micro-sensors,
temperature sensors 18B20, humidity sensors DHT11, illumination
sensor TSL2561, to achieve the environmental temperature, humidity
and light intensity three parameters of the acquisition, storage,
display and other functions. in addition, the system also has alarm
functions, when data collected of the sensor is not within the scope
setted by the user, the buzzer will alarm to alert the user.The
system is reliable, simple and cost-effective.
Keywords: STC89C52 microcontroller, temperature, humidity,
light, the liquid crystal display, alarm function
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