Transcript Presentation

Virtual Training Room
David Hernandez, Joshua Opada, Dorian Ozoude
Group #43
TA: Kexin Hui
Introduction
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In recreation centers, the floors tend to
be boring with outdated layouts that
have been unchanged for years
We saw an opportunity to create an
interactive and visually appealing gym
floor constructed of LED tiles
This LED floor would be an efficient
way to change the floorplan to any type
of display for any sport
This interactive aspect of this floor
would be used to implement different
types of sports training programs
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http://www.laflinesque.com/?paged=2
Objective
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The core objective for this project is a
proof-of-concept model since our
resources and time are limited
This model generates floorplans for
sports such as:
– Basketball
– Volleyball
– Track
Also incorporated a user-interactive jump
rope game
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Block Diagram
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Circuit
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Tile Frame
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Features:
– Supports weight and physical stress adults exercising
– Translucent to allow visible light from LEDs to shine through while still masking
circuitry
– Allows sufficient space for the LEDs the load cells and other circuitry
– Interlock on any side with other tiles
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Design Considerations
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Through research, we found
polycarbonate to be a sufficient material
for our impact resistance requirements
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For interlocking the tiles we added a
male and a female connector on each
side
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LED Array
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Each tile has a 5x5 array of WS2812B
RGB LEDs
25 LEDs are connected in parallel in a line
throughout the tile to form a square
Each tile has a resolution of 5x5 with each
LED representing 1 pixel
Each LED is spaced 2.5” apart from each
other
– This LED spacing continues when one
tile is connected to another tile
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LED Array
http://www.seeedstudio.com/document/pdf/WS2812B%20Datasheet.pdf
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PWM Timing
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The timing for the PWM is important to
send the proper data to the LED arrays.
– To send a low code in the PWM is
high for 0.35 µs and low for and low
for 0.9 µs.
– Visa versa for a high code
– Doing the math, the LED array
would be updated at a frequency of
1.3 kHz which is fast enough for
smooth movement.
http://www.seeedstudio.com/document/pdf/WS2812B%20Datasheet.pdf
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Load Cells
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The load cells used in the tiles were
TAS606 sensors that were rated for 200
kg
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Each load cell was placed at each corner
of a tile.
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Data was taken from each of the 4 load
cells to determine where the user is on
the tile.
https://cdn.sparkfun.com//assets/parts/1/0/6/3/2/13332-01.jpg
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Load Cells
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Load Cell Amplifier
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The HX711 amplifier was used to
amplify the signals being sent from
the sensors.
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Allows the data to be usable by the
microcontroller
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Allows for calibration of the sensors
through the microcontroller
https://cdn.sparkfun.com//assets/parts/1/1/5/1/0/13879-04.jpg
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Bluetooth
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A HC-05 Bluetooth module to allow for
Android phones to communicate to the tiles
wirelessly
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We required to module to be able to
communicate with an Android phone from
at least 10 ft away
http://www.martyncurrey.com/wp-content/uploads/2014/10/HC-05Basic-set-up-584x455.jpg
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Application
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The application allows the user to
connect to Bluetooth.
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It also displays the state of the LED
array
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Buttons can be pressed to change the
state from an Android smartphone
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Microcontroller
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An ATMega328p was used as a microcontroller to control each tile
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Each of the microcontrollers have to communicate to each other for dynamic lighting
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The microcontroller had to be able to output the PWM signals that contained the data to
change the color and brightness of the LED array
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The microcontroller also needed to be able to communicate with the Bluetooth module
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Flow Chart
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Powering the LED Array
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LEDs
– Requires 5 V
– Draws 60 mA when the LEDs are a full brightness will all RGB settings set to their
maximum value
– We used these rated voltages and currents to calculate the max power to be drawn
from the LED Arrays
• (5 volts DC) * (60 mA max per LED) * (50 LEDs) = (5 V DC) * (3 A) = 15 W, max
power from LEDs
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Powering the Control Circuit
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As noted in the block diagram, power is individually routed into each tile
– In each tile, the power is further routed to the LED Array, the Bluetooth module, the
microcontroller, and the load cells
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The current drawn by the remaining circuitry
– Bluetooth module: maximum of 30 mA
– Load Cells: 3 mA per load cell (4 load cells are used)
– Microcontroller(ATMega328p): 46.5 mA per chip (2 chips are used)
– Total: 30 mA + 4 * 3 mA + 2 * 46.5 mA = 135 mA
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Total Power Drawn = (135 mA + 3 A) * 5 V = 15.675 W
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Power Supply
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Converts 120 V AC to 5 V DC
– Takes grid voltage by plugging
directly into the wall and sends 5 V
output to the circuitry in each tile
Current Rating
– For safety considerations, we rated
the Power Supply at 6 A to avoid
reaching the limits of the source
http://www.digikey.com/product-detail/en/xp-power/ECL25US05P/ECL25US05-P-ND/4696227
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Results and Important Verifications
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The tile allowed for an adult to jump on the tile 5 times as per verification
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LEDs were controlled properly using microcontroller in order to display an image of each
court, track or game
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Load cells calibrated so that it throws away any weight measurement less than 30 lbs.
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Conclusion and Further Work
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Lower Price
– The most expensive part are the load cells at $50 each. We would like to attempt
to work with cheaper load cells. We aren’t worried too much about the precision of
weight measurement.
Modular
– In the future we would like the tiles to have connectors at the center of each side of
the tile that interconnects power and data between the tiles without taking them
apart.
Interactive Implementations
– The success of the jump-rope game functionality offers promise for further userinteractive training programs such as a track floor that remembers a user’s previous
running time and uses that data to challenge the user to further beat their running
time.
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Thank You
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