Abstract
This chapter discusses temperature measurement and control. Storage, programmability, and on-line decision-making capabilities make microcomputers attractive to use in temperature-measurement and temperature-control applications. The required temperature levels can be programmed to change in the required manner, or according to the time of day. They can be programmed for a year in advance and can be altered to meet the changes in requirements. The heat needs to be measured or compared to a fixed level to allow a microcomputer to detect an over-temperature and start a cooling device, sound an alarm, or shut the unit safely. A typical microcomputer designed to control temperature is based around a microcontroller and is likely to have most or all of the interface and decision-making circuitry on a single board. The temperature interface circuit can be designed as an add-on card for inclusion within the casing of a general-purpose microcomputer. The method of operation of microcomputer-based temperature controllers can be based on the generation of a time-proportional signal where the microcomputer controls the percentage-On time of a fixed time cycle.
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