Temperature and humidity control with PIC microcontroller in a closed environment

Microcontrollers are used extensively in the industry for the control purposesdue to the recent development in microelectronic technology. We can denote within themicroprocessor usage area home and office machines with control processing ofindustrial systems.PIC (Peripheral Interface Controller) microcontrollers are used programmingmethod called RISC (Reduced Instruction Set Computer) technology. Although theyhave a little number of commands, they provide speed and programming elasticity.Controlling the processes with microcontrollers provides calculation ability on processvariables and gives advantage of changing the processes depending on the software ofthe PIC.The aim of this thesis is to control the change of temperature and humidity in aclosed environment within the desired direction using the PIC microcontrollers.Temperature and humidity sensors are investigated to approach this purpose. In thetemperature and humidity control processing to measure and control these values asdigital, hardware are developed by using the PIC microcontrollers. Also to provide thesystem control various software are developed.Sensors which sense the temperature and humidity are used to determinewhether the temperature or humidity is at the desired value or not. Investigating therecent development of electronic technology to measure the temperature, a digitaltermometer is developed using the LM35 integrated circuit. Sensing these two processvariables to control the temprature and humidity in a closed environment at theexperimental control process, SHT11 sensor is used together with PIC microcontroller.Control processing is done via closed loop control with feedback and ON/OFF control.In the control processing program which is done temperature and humidity ismeasured and to approach the desired values heating and humidifying process isrealized depending on the program which is written on the PIC microcontroller.Simulation studies of the realized digital termometer are done on the ISISprogram. The applications developed within this research study have potential featuresfor practical applications and for future work within this direction.