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Computer labs Gleason 3159
and Gleason 3149
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contain high-power workstations used to
design semiconductors.
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This process produces a lot of heat.
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The HVAC system in the room commonly
breaks down
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causing excessive heat to build up within
the room.
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These high temperatures can interrupt
computer processes
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and cause poor computational performance
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and uncomfortable conditions for people
who may be using the lab.
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Our solution is to install a system in
each room
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that alerts the IT admin when the
temperature or humidity of the room
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increases to an unacceptable level.
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This system uses a custom control hub
and two custom satellite hubs
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within each room to communicate with
RIT’s Zabbix system,
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a network monitoring software.
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Each control hub and satellite node
is built around a custom PCB.
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This diagram shows which components on
each circuit board
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interact with each other and
how the boards interact.
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This diagram can help with
troubleshooting in the event
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of an error or malfunction within
one of the components.
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After taking various measurements
throughout the room
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using commercial temperature and humidity
sensors
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it was found that the room temperature was
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relatively consistent throughout the
room.
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We determined that it would be best
to place
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the sensing satellite nodes in the
Northwest and Southeast corners
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of each room with the control hub being
placed in the Northeast corner,
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near the door for accessibility.
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The control board is responsible for
receiving the values from the satellites,
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and displaying the values in the room.
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It is powered through power-over-ethernet,
or PoE.
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It contains a power multiplexor to
differentiate between USB-C power and PoE,
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a voltage regulator to lower the 5 volts
to 3.3 volts,
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an ethernet controller,
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an RP2040 microcontroller paired
with flash memory,
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and a light sensor.
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An expansion port is also included for
any modifications
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the client may want to make in the future.
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The satellite board measures the
temperature and humidity data
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and sends the data back to the control hub.
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The onboard sensor communicates with a
I²C controller on the
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board then sends the data back to the
microcontroller on the control board.
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Two connectors are included on the board
which allows
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multiple boards to be daisy-chained together.
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The different satellite boards in a chain
can be identified
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using an LED on the board.
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