Abstract
Temperature and humidity test box is widely used in real life, the temperature and
humidity test box can provide a constant humidity or temperature environment,
continuously adjustable to achieve temperature and humidity, automobile motor,
aerospace, weapons, ships need experimental temperature and moderate, to test their
stabilities of various performance indicators.
In this paper, the design system is divided into equipment and control room
equipment two parts, to every part of the design of software and hardware, the system
with RS232 communication interface circuit, CPU part uses AT89S52 microcontroller,
temperature sensor using AD590 temperature sensor, humidity sensor using the relative
humidity sensor HIH-3610-1 of Honeywell, a communication module based on CAN
bus communication transmission. The control room by PC for display and control, in
the part of software design of the main program, the lower computer information
acquisition subprogram, the A/D conversion subroutine, CAN bus communication
subroutine program to control the controlled object, design the PID control algorithm
subroutine, through the design of software and hardware, realizes the control function
table experimental box on the temperature and the realization of the experimental box
temperature and humidity data telemetering and remote control, the control room and
the one PC function at the same time 15 the operating status of equipment.
Design and implementation of the design of MCU temperature and humidity test
chamber based on the temperature and humidity test chamber, the scheme has low
power consumption, high efficiency and other characteristics, and has the advantages of
safety, economy and high reliability.
Keywords: temperature and humidity; test chamber; MCU; CAN bus
