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P11016: Intra-building Navigation
Shannon CarswellDan ParisTim Garvin
Dan Stanley
Outline
• Architecture and Process Diagrams• Bill Of Materials• Component Details• Interfaces• Software Information• Electrical Information• Test Plan• Risk Assessment• Feasibility Analysis
Architecture Diagram
RFID Reader RFID TAG
Microcontroller
Tag Number
INTERFACE(Computer)
Compass
Direction
I/O
Power Supply
Hand Held Device
Process Diagram
Map
Find Next Waypoint
Get current Location
Get Target Destination
(UI)
Translate to Location
UUID
BuildMap
There yet?
Tell User We’ve Arrived
(UI)
Give Directions (UI)
Manual Data Entry
UI Input
Tag UUID#
Tag UUID#
Yes
No
Bill of Materials
RFID ReaderSkyeTek M9 Module (MH)
– Frequency: 862-955MHz– Size: 70x53x9 (mm)– Weight: 12.5g– Read Range: 3.5m– Supply Voltage: 4.5-5.5V– Price: $274.00– Tag Compatibility: EPC Gen1 & EPC Gen2
RFID TagsALN-9654 “G” Inlay
•Size: 3.8”x0.9”
ALN-9634 “2x2” Inlay
•Size: 1.76”x1.76”
ALN-9662 “Short” Inlay
•Size: 2.76”x0.67”
ALN-9630 “Squiglette” Inlay
•Size: 2.76”x0.37”
ALN-9640 “Squiggle” Inlay
•Size: 3.73”x0.32”
RFID Antenna
ANT-VDP-DB1-RPS
• Frequency: 824-960MHz• VSWR: <1.5• Impedance: 50 ohms• Connector: SMA• Polarization: Linear• Size: 4”x0.8”x0.18”• Cost: Free
RFID Component Connection
Dev Board:Explorer 18
•Maximum Flexibility
•Debugging Support
•Too large to strap to arm.
•Enables confidence in later PCB
•Comes with Superset representative of the PIC18 family.
Microcontroller
PIC18F8722Microcontroller
Compass RFID Reader
Keypad Tactile Response Etc.
I2C
GPIO & PWM
Microcontroller Interfaces
Microcontroller:PIC18F8722
• “Head of the Family”
• 5 PWM Outputs
• I2C
• Aggressively Low Power
• Supports 5V Rail, down to 2V
Microcontroller Pin-out
Compass
• Freescale – MAG3110 3 Axis Magnetometer• Low Power Draw 24uA at 0.95-3.6V• Popular Consumer Electronics I2C Compatible Interface• Miniature Size 2x2x0.8mm• Maximum Measurement Frequency of 400Hz
Microcontroller and Compass Interface
• Both MC & Compass Support the Popular I2C Interface
I2C Interface• 2 Wire Interface for Low Speed Consumer Electronics• Commonly Used to Attach Peripherals Components to Motherboard• Ideal for the Low Speed ADC on the MAG3110 Chip
Navigation
• ‘Hybrid’ Algorithm– Graph Traversal– Area Navigation
• Terminology– Tag– Area– Waypoint
B
A
C
Navigation
• ‘Hybrid’ Algorithm– Graph Traversal– Area Navigation
• Terminology– Tag– Area– Waypoint
B
A
C
Power Supply Circuitry
V 19 V d c
C 1. 3 3 u
C 21 u
R 11 M e g
R 21 M e g
U 1L M 7 8 0 5 C
I N1
O U T2
GN
D3
U 2 A
TL C 2 7 7 / 1 0 1 / TI
+3
-2
V+
8
V -4
O U T1
00
V 1
V 2
V 1V
V
Power Supply Simulation
V1: 4.986 V
V2: 2.498V
Time
0s 0.1us 0.2us 0.3us 0.4us 0.5us 0.6us 0.7us 0.8us 0.9us 1.0usV(V1) V(V2)
2.4V
2.8V
3.2V
3.6V
4.0V
4.4V
4.8V
5.2V
(214.783n,2.4984)
(323.478n,4.9967)
Electrical Circuit for Compass
Test Plan
Objective:
Verify communication between all components in RFID System
• Reader vs. Antenna• Reader vs. Tags• Read Range vs. Tags• Reader vs. Micro• Compass vs. Micro• Power supply vs. RFID
system• Computer vs. Micro
Risk Assessment Changes
Feasibility Analysis
Dead Zone Solution
Future Plans
• MSD I– RFID Testing/ Feasibility Analysis– Read RFID Tag UID– Figure Out Wiring– PCB/Vector Board Considerations