With the rising cost of energy, it is important to be able to efficiently control the temperature and/or humidity in an enclosed environment. A method of controlling these parameters will be presented. System modelling techniques used in this project will also be discussed. The temperature controller consists of a zero-crossing switch, heating element, and a pc. The pc will provide an error signal to the zero-crossing switch that will maintain the temperature in a house at a constant level. PID control and compensation techniques will be discussed in connection with temperature. A procedure for controlling the humidity will also be presented. 
 

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