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CPU FAN RPM MEASUREMENT
WITH HALL EFFECT SENSOR
09/11/2016
Aim/Introduction
Theory/Principle
 Magnetic sensors are solid state devices that are
becoming more and more popular because they can be
used in many different types of application such as
sensing position, velocity or directional movement.
 Our project consists of one of those application namely
RPM measurement of a CPU fan.
 Also the slightest changes in circuit and programming
will result into displaying different applications hence
this project can be a viewed as a standard one for Halleffect applications.
 Normally the hall-sensor is attached inside the cpu fan
but we have done this project by using hall-effect
sensor externally and built external circuit for that in
order to better understand its working principle and
applications.
Hall Effect occurs when a current passing through a
conductor in the presence of a transverse magnetic
field produces an asymmetric distribution of charge
resulting in a transverse electric field.
Figure 2: Your caption to go here
Procedure
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 Connecting the Basic hall-sensor circuit and
testing it with Arduino Due by using PC.
 Building the controller circuit of 1602 LCD display
and installing it on the breadboard.
 Building the mutual connection of LCD display and
hall-effect sensor with Arduino Due.
 Building the magnetic CPU fan system and giving
it a 12V DC power supply .
 Installing library of 1602 LCD display and Arduino
software.
 Writing Code for Arduino Due and LCD display and
making digital input-output connection to Arduino
and LCD display.
 Running the Set-up and doing required
measurement.
Result
 Our system is working fine and it measures the CPU fan RPM under various ranges.
 We have plotted the graph and taken data for fan RPM with time under a random experiment
as an example.
 LCD is displaying the result as expected along with input name provided.
CPU FAN RPM MEASUREMENT
WITH HALL EFFECT SENSOR
09/11/2016
What next ?
 Hall-Effect Sensor can also be used for the
Characterization and Detection of Magnetic
Nanoparticles for Biomedical Applications but that
would be more complex and require advanced
technique.
 The next one is quantum Hall effect (QHE) which
is a phenomenon visible in Hall effect
measurements on a two-dimensional electron gas
in strong magnetic fields and at low temperatures
and can be applied in metrology.
Figure 2: Your caption to go here
Conclusion
 The Arduino Due board is a very useful tool which converts raw data to a useful output.
 But, one precaution must be taken for Arduino due as it has 3.3V tolerant pins. If higher than
is given
to any
Figure3.3V
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to go here Quisque
viverra pin of due, it will damage that pin or probably entire board.
lectus ac lectus
 The maximum value of RPM of the CPU fan is in the range of 1200 to 1400 but the actual
maximum value of RPM of a CPU fan is about 3000, this is due to the fact that we have
attached magnets on a blade of the CPU fan which reduces the maximum speed of the CPU fan
by almost a factor of 3.
 The constant blinking of the red light insures that our system is working just fine.
References:
 American journal of Physics
 www.berkeley.edu
 www.arduino.cc
 https://en.wikipedia.org/