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Shiv
Yukeun
Donghan
Robert
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Project overview Project-specific success criteria Block diagram Component selection rationale Packaging design Schematic and theory of operation PCB layout Software design/development status Project completion timeline Questions / discussion
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HID for touch-based control Move mouse cursor, other applications
Wearable glove Three fingers – touch sensors/accelerometers
Bluetooth communication UART interface
Battery powered Rechargeable through USB connector
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Communicate “mouse commands” wirelessly via a Bluetooth interface.
Move cursor using motion of a single finger.
Encode and decode gestures Distinguish among cursor movement,
mouse clicks, and gestures via finger-tip sensors.
Charge battery and manage battery power
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Microcontroller
Microcontroller PIC18F4550 ATMega640
Manufacturer Microchip Atmel
Operating Frequency 4kHz - 48MHz 1MHz - 16MHz
SRAM Memory 2048 bytes 4096 bytes
Flash Memory 32k bytes 64k bytes
Number of I/O pins 35 pins 32 pins
Operating Voltage 2.5V - 5V 2.5V, 2.7V, 3V, 3.3V
ADC 13 16
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Bluetooth Module
Bluetooth WML-C40 RN-24E
Manufacturer Mitsumi Roving Networks
Frequency 2402 - 2480MHz 2402 - 2480MHz
Power supply 3.2V - 3.4V 3.3V
Current consumption 90mA 50mA max
Transmission rate 2178kbps max 721kbps
Receive sensitivity -82dBm -80dBm
Output level 20dBm (class 1) 4dBm (class 2)
Dimensions13.2(w) x 18.8(L) x 2.05(H) mm
20.32(w) x 50.8(L) x 4.08(H) mm
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Battery/Battery Charger IC MAX1555
Manufacturer: MAXIM Designed to charge Lithium polymer batteries Input range:
USB: 3.7V to 6V 100mA charge AC adapter: 3.7V to 7V 350mA charge
Can charge with either USB and/or AC adapter Cheap and small
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Accelerometer
Accelerometer ADXL213 LIS3L01AL
Manufacturer Analog Devices STMicroelectronics
# of axes 2 3
Voltage 3.3V - 6.0V 2.4V - 3.6V
Output Methods PWM / Analog Analog
Sensitivity 1.2g 2g
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Touch Sensor FlexiForce
Manufacturer: Tekscan Sensitivity: 1 lb/25lb/100lb Slim and easy to interface Acts as a variable resistor
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OKW Ergonomic Enclosure 150mm x 100mm x 40mm
Main PCB Breakout-boards/Sensors
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Force Senso
r
Force Senso
r
Force Senso
r
X-YAcceleromet
er
2 2 2
Bluetooth Module
Bluetooth Module
Battery Charger
Battery Charger
Battery
USBUSB
Main PCBMain PCB
X-YAcceleromet
er
X-YAcceleromet
er
Computer
Bluetooth
Receiver 2
Breakout Board 1
Breakout Board 1
Breakout Board 2
Breakout Board 2
Breakout Board 3
Breakout Board 3
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Microcontroller
Bluetooth
Battery Charger
Touch Sensors
AccelerometerSensors
ICD 2
LED
Crystal Oscillator
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Breakout Board (Accelerometers)
• Three breakout boards for accelerometers
• Main purpose of this is to reduce noise
• Cx and Cy determine the bandwidth
• 0.1uF will be used
• Bandwidth = 50 Hz
• Noise = 17.91mV which is 0.35% of maximum output voltage
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Accelerometers
• Input impedance should be lower than 2.5Kohm
• Voltage Follower circuit
• To reduce input impedance
• 5V Rail-to-rail
• Single supply
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Touch Sensor
To ATD
• Without load, Rs is 1Mohm
• An inverting operational amplifier
• Different voltage levels – different resistance values
• RF = 300Kohm
• Vout = -5 * ( 300Kohm / Rs )
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Touch Sensor
Generate -5V
• DC voltage inverter
• Vout = -5 * ( 300Kohm / Rs )
• To generate positive voltage output
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Battery Charger
USBPOWER
USB Detection
Charge Status
DCPOWER
Battery
Battery LED
Schottky diode
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Switch
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Analog
MICRO
BluetoothCharging
USB
Power
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Microcontroller Bluetooth Accelerometer Touch Sensor Windows Driver
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Week 9 – Finish PCB layout, Accelerometer code
Week 10 to 11 – Bluetooth, Force Sensor code, Windows Driver
Week 12 – Windows Driver, Soldering Week 13 – Packaging, integration Week 14 – Testing / Documentation Week 15 to 16 – Testing / Wrap up /
Documentation
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Week 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
Project Proposal Component Search
Package Design Design Schematic
PCB Layout
PCB Assembly Circuit Debugging Software Development Software Debugging
Packaging
Testing
Documentation
Wrap Up
Stress Levels
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