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Currently commercially available bathroom ventilation control devices are generally equipped with manual / automatic fan operation time setting and the heater switch only.and the delivery of the air volume of existing multi-wing fans are all fixed, there is no multi-speed variation, leading to an uneven temperature distribution of the bathroom between the high level and the lower level of it apparently,In order to resolve this issue, this paper tries to design an intellectual bathroom ventilation system.And this system is having three set temperature and humidity sensors being installed at different locations, and through the help of PIC 18F2520 SoC that the retrieved analog signal will be converted into a digital signal,and then through the USART asynchronous receiver transmitter transmits it to the fuzzy control core PIC 18F4620 for processing the fuzzy logic deduction,when the temperature dT1 of 3 ℃, dT2 to 3 ℃, RH is 45%, the output of the result obtained by the fuzzy logic deduction shows that the multi-wing inlet fan should be run in second speed as well as the multi-wing exhaust fan. And the heater should be turned on apparently and definitely.Through the use of the output of the result obtained by fuzzy logic deduction, it can be done that to try to let the multi-wing inlet fan and multi-wing exhaust fan run with different speeds so as to deliver different air volumes and switching ON/ OFF the heater automatically, as a result, the temperature between the high level and low level of the bathroom is approximately less than 0.5 ℃. In other words, it is proven that there is an effect of constant temperature being found out.and with the help of optical switches, the multi-wing fan speed calculation can be done correctly so as to compare the calculated data, which has been obtained of individual speed sections, with the pre-set value relatively. And to see if its difference is less than 150 rpm, If it is not, the alarm system will be activated and buzzer sounds consequently.Moreover, user can also see those related information, such as three sets of data value of temperature as well as humidity, the speed both of the Multi-wing inlet &; exhaust fans, the input &; output parameters of the fuzzy logic deduction, etc. on the cartographical liquid crystal display of course.
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