Abstract— In this paper, the development of a water bath
temperature system to control the liquid’s temperature in the
water bath will be presented. In order to develop the water bath
temperature control system, MATLAB fuzzy logic toolbox will be
utilized. The Fuzzy Logic Controller (FLC) is designed to control
water temperature based on the input acquired from the thermal
transducer sensor. The inference engines that are used are; Maxmin
(Mamdani) method and centre of gravity technique for
defuzzification. The 4 x 4 matrix rules for the controller will be
used in this project. In addition, the USB NI-DAQ card will be
used as xPC target to link the MATLAB software and real time
application. The real time output temperature is validated based
on the simulation’s temperature which is initially set by user. It
can be concluded the performance of real time study is in par
with the simulation result.