Download Swish Sleeve PCB Layout Design Narrative

Swish Sleeve
PCB Layout Design
Narrative
Stephen MacNeil, Michael Kobit,
Sriharsh Achukola, Augustus Hong
Project Overview
We would like to design and implement a shooting
sleeve made from compression material that basketball
players or pitchers could wear to track their motion,
without the use of cameras. This prevents current
occlusion issues inherent in optical motion capture. The
sleeve can be extended to other sports as well and
beyond the scope of this class could be extended to an
entire suit which could monitor sports performance in
athletes.
Block Diagram
Overall PCB Design
Consideration
Microcontroller
Decoupling capacitors required for power pins
ceramic type capacitors for reducing high frequency noise
Separate the circuit into 4 parts:
Microcontroller
Transmitting device(XBee)
Analog circuits(switch mode voltage regulator)
Digital curcuits(LCD, IMU inputs)
Micro Considerations
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•
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Passive Components
•
Decoupling Capacitors close to power and ground.
•
No external clock oscillator circuit needed (Using Internal
CLK)
Routing
•
Paced in center to provide shortest path to peripherals.
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Connects to components from every side.
Headers/Jumpers
•
ICSP for on-board programming
• 3 IMUs that require 6 pins
•
LCD and battery
Power Supply
Considerations
Multiple Voltages
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3.7V battery supply
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3.3V regulated for components
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5V regulated for LCD display
Layout
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Switching Regulator (3.7V stepped down to 3.3V)
•
Charge Pump (3.3V stepped up to 5V)
Parts
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LM20143 (3A @ 3.3V, 150mA needed for design)
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TPS60241(25mA @ 5V, 3.5mA needed for design)
Schematic
(Switch Regulator & Charge Pump)
Schematic
(Micro, Xbee and IMU headers)
PCB Layout
Questions?