System Using Fuzzy Controller
Fig 1. Circuit of egg
incubator's temperature control using AT89c51
This circuit works
based on the fuzzy control algorithm that load in AT89c51. The output of
controller is connected from port 2 AT89C51 to port 1 of AT89C2051 and
p1.0 as sign bit.
AT89c2051 is used to generate PWM signal, this signal is used to drive the
heater and fan. The logic circuit is used to propagate PWM signal to heater if p1.0
and to fan if p1.0 high.
information from LM335, after processed by ADC 0809.
The figure below is
temperature control system response, when the loaded program is
Fig 2. Control system
response using three different type of controller.