With the development of the life and times of change, from the original temperatu
re seems to be not controlled quantity to a controlled amount of today. It is precis
ely because of this change highlights the importance and significance of temperature
control. And industrial production are used in electric furnace, crucible resistan
ce furnace and the temperature control box, so the SCM has become a core partner of
it, not only can solve the artificial control of complex objects but also can improv
e the control precision and not a good indicator therefore, the microcomputer tempe
rature control technology is being widely accepted by people. This work is the cons
tant temperature control system design of temperature, can be used in production and
can also be used in scientific experiments can also be used in the hospital. In the co
nstant temperature box temperature often change to use environment, can make the te
mperature range at a certain temperature, so as to adapt to the life and work. But als
o can set the temperature environment in which you want to achieve.
This paper first describes the working principle of constant temperature control
box, hardware based software as the core of the introduced, several hardware I wou
ld flow diagram to introduce, so we can easily understand its working process, a
nd each module of the function The first is the hardware we use STC89C51 single chip m
icrocomputer, it has the internal integration of digital to analog conversion and enca
psulation of small advantages coupled with the temperature sensor DS18B20.The softwar
e aspect, the precision of the PID algorithm, not only to achieve a small overshoot,
high control precision, fast response linearity and low cost When users according t
o their own requirements on the button to choose their desired temperature, temperat
ure input and then collected by the microcontroller temperature measurement element a
nd accurate than PID algorithm and feedback, and then output signal for heating
device heating. Here PID is the core of the software If the PID control of temperatu
re, temperature stability in the ideal range Under the same conditions, in the settin
g of PID. The temperature control box to achieve the most ideal effect in the process, s
o that it can be quicker to quasi steady temperature regulation, you will find and
understand what kind of adjusting parameter is more suitable to achieve the effect of
faster.
Key word：Constant temperature ，SCM，PID algorithm
基于单片机 PID 的温度控系统研究
