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Networked Weather Station


Design Details (Project Scope) Students: Responsible for the weather station itself, which includes reading in sensor values onto the Kinetis KW2x MCU radio board and ... – PowerPoint PPT presentation

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Title: Networked Weather Station

Networked Weather Station
(EE 4391 Group 2.3)
  • Senior Design Project Team
  • Dean Thomasson, Stephen Frank, Nick Speir

Sponsored by
Background Information (IoT)
  • Internet of Things (IoT)
  • The IoT allows us to network physical everyday
    objects with embedded electronics and software to
    achieve a greater value and service through
    exchanging data and operation control.
  • Freescale wants to become more familiar with how
    best to integrate their hardware into the IoT

Design Details (Goals)
  • Construct a weather station that communicates
    over a Thread (IEEE 802.15.4) network
  • Collect inputs from various weather sensors.
  • Aggregate, package and transmit the collected
  • Store the final data in a central database.
  • The final design should focus on
  • Low energy (low power consumption) remote nodes.
  • Small size and low cost.
  • Final design reports to be submitted to Freescale
    to be used as reference design material or as
    application notes

Design Details (Stretch Goals)
  • Display data from the database using analytical
    graphing software.
  • Analyze the effects of loading the ZigBee network
    with a lot of sensors and traffic.
  • Provide remote power source for the weather
    station (i.e. solar panels or batteries).

Design Details (Project Scope)
  • Students Responsible for the weather station
    itself, which includes reading in sensor values
    onto the Kinetis KW2x MCU radio board and then
    transmitting those values over the Thread
  • Freescale Responsible for configuring the
    Thread stack and central gateway router to
    request sensor data from the weather station and
    then pass along that data to Proximetry over the
  • Proximetry Responsible for receiving the data
    from the central Thread gateway router, storing
    the data, and providing access to visualize the
    data via a Web User Interface (Web UI).

Design Details (Network Diagram)
Design Details (Hardware)
  • Minimum Accuracy/Resolution of Weather Sensors
  • 1 kPa for pressure
  • 0.5 C for temperature
  • 0.011 inches for rain fall
  • 1 MPH for wind speed
  • 22.5 degrees for wind direction
  • 10 µW/cm2 for irradiance

Design Details (Hardware)
  • Temperature Sensor
  • -40 C to 125 C Range
  • Freescale Barometric Pressure Sensor
  • 50 to 115 kPa, Absolute
  • Wind Speed/Direction and Rain Sensor
  • Rain Gauge Self-Tipping Bucket, 0.011 inch
  • Anemometer Cup Type 1.492 MPH 1 pulse per
  • Wind Vane Eight resistance type sensors, 22.5
  • Light Sensor
  • Contains both infrared and full spectrum diodes
  • Extremely wide dynamic range 1 to 600,000,000
  • Temperature range -30 to 80 C

Design Details (Hardware)
  • Possible Future Upgrades
  • Better sensors such as a PAR (Photosynthetically
    Active Radiation) sensor, which measures
    photosynthetic light levels in both air and
  • Provide remote power source for the weather
    station (i.e. solar panels or batteries).

Design Details (Hardware)
  • Freescales Kinetis KW2x MCU Radio Transmitter
    Board is programed to read in the sensors using
    Freescales Kinetis SDK and IAR

Design Details (Software)
  • The transmission of sensor values uses Thread, an
    IPv6 based protocol for smart home devices,
    which is built on top of the IEEE standard
    802.15.4 for low rate WPAN.

Design Details (Software)
  • The 802.15.4 standard defines the physical layer
    (PHY) and media access control (MAC) layer

Design Details (Software)
  • The physical layer defines frequency, power,
    modulation, and other wireless conditions of the

Design Details (Software)
  • The MAC layer defines the format of the data

Design Details (Software)
  • Thread provides enhancements to the network and
    transport layers such as authentication,
    encryption, and a data routing capabilities like
    the self-healing mesh network.

Design Details (Software)
  • Implementing Thread in our project

Design Details (Software)
  • The first thing that happens is the Thread
    gateway router sends out a request for sensor

Design Details (Software)
  • Upon hearing the request the Transmitter board
    will read in the requested sensor values.

Design Details (Software)
  • The transmitter board then responds to the Thread
    gateway router with the requested values.

Design Details (Software)
  • The sensor values are then sent over the internet
    to the Proximetry database where they are stored.

Design Details (Software)
  • Real-time weather station data can be accessed
    from any browser via Proximetrys Web UI.

Design Details (Validation Testing)
  • Individual Sensor Verification
  • Data Transmission Verification
  • Completed Design Verification

Bill of Material (Prototyping)
  • Freescale Parts
  • Tower KL46Z Microprocessor Board 150
  • Tower Elevators 80
  • Tower Analog to Digital Converter Board 120
  • Kinetis KW2x MCU Radio Board 150
  • Tower Prototyping Board 15
  • Freescale Barometric Pressure Sensor 15
  • Total 530
  • Non-Freescale Parts
  • Wind Speed/Direction Rain Sensor 70
  • Light Sensor 7
  • Temperature Sensor 2
  • Enclosure 50
  • Unistrut Mounting Frame 88
  • Total 217

Bill of Material (Production)
  • Freescale Parts
  • Kinetis KW2x MCU Radio Board 150
  • Freescale Barometric Pressure Sensor 15
  • Total 165
  • Non-Freescale Parts
  • Wind Speed/Direction Rain Sensor 70
  • Light Sensor 7
  • Temperature Sensor 2
  • Enclosure 50
  • Total 129

Budget Review
  • Freescale Budget for non-Freescale parts 200
  • Freescale Budget Spent to Date 129
  • University Budget Undefined
  • University Budget Spent to date 88

Manufacturability Issues
  • Need for Custom connector
  • A custom connector must be manufactured to
    connect the weather sensors in the production
    model. This could increase production costs and
    lead times slightly.
  • Translucent Material Needed
  • The light sensor housing needs to be a highly
    transparent material that doesnt fog up or
    collect dirt easily.
  • Automated assembly could be costly.

Societal Impact
  • The Internet of Things (IoT) has the potential to
  • change the way we interact with the world around
  • The networking protocol, Thread, is already being
    used by connected thermostats and other home
    automation applications.
  • With all of these devices connected to the
    internet they are opened up to remote access and
  • This level of connectivity has the potential to
    greatly increase the usefulness and benefit that
    we normally receive from everyday devices.

Environmental Impact
  • The weather station has a relatively low
    environmental impact.
  • All of the materials used in its construction can
    be recycled by conventional means, such as with
    the plastic enclosure or metal mounting frame, or
    through an electronics recycling facility for
    silicon devices.
  • Its low power consumption provides for efficient
    operational costs both economically and

Ethical Responsibility
  • Security
  • To protect the security of data and intellectual
  • all documentation and software was accessed by
    machines which were password protected. Or if
    this was not possible (like on the Kinetis KW2x
    MCU radio board) it was kept locked up when not
    in use.
  • Access was limited to only those who were
    directly involved in the project.
  • Safety
  • Best practices for electrical safety were used
    when constructing the weather station to ensure
    the safety of all those who may come in contact
    with it.

  • The Networked Weather Station provides a means
    for remotely monitoring various weather sensors.
  • This is accomplished via a Thread network using
    Freescales Kinetis KW2x MCU Radio Board and
    gateway router.
  • Real-time data can be accessed from any browser
    via Proximetrys Web UI.
  • The production cost of a fully assembled weather
    station with wireless transmitter is expected to
    be less than 300.
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