Download Microcontroller-Based PC Thermometer with Regulated Fan

advantages. This gave the group the knowledge that there were two types of
variation. The group also learned that closed loop variation uses a tachometer in
order to adjust its speed.
In Mr. Darrin Vallis’ article entitled “Closed-Loop Fan Control at System
Level”, (2004) he discussed briefly the disadvantages of an open loop and how
closed loop can be better in comparison. This article gave the group a wider
knowledge on the advantages of a closed loop. The article also discussed that a
tachometer feedback is used in a closed loop variation. Mr Vallis also discussed in
his article what tachometer feedback is and how it works.
In addition, Myke Predro (1997), in his book entitled “Handbook of
Microcontrollers” discussed Motor Control and LCD Control. The article discussed
the different methods that can be used to control motors. The article discussed
that the easiest way to control motors is to switch them on and off. This study
was used by the group since the project involved is controlling the fan speed
depending on the temperature. The article suggested that controlling the motor
speed is normally done by pulsing the control signals in the form of a pulse wave
modulated signal, which is usually called Pulse Width Modulation. The group
used the knowledge gained from the article about pulse width modulation and
other methods on controlling motors in the design of the project. Also, the article
on LCD control focused on the discussion on how to use an LCD. The article also
discussed the basic pin configuration usually used. The article was used by the
group to gather information on LCD, how they work and how the LCD can be
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