Swish SleevePCB 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

• 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.

• 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• 3.7V battery supply• 3.3V regulated for components• 5V regulated for LCD display

Layout• Switching Regulator (3.7V stepped down to 3.3V)• Charge Pump (3.3V stepped up to 5V)

Parts• LM20143 (3A @ 3.3V, 150mA needed for design)• TPS60241(25mA @ 5V, 3.5mA needed for design)

Schematic (Switch Regulator & Charge

Pump)

Schematic (Micro, Xbee and IMU

headers)

PCB Layout

Questions?