Processor, Bus Driver, and Latches
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Transcript Processor, Bus Driver, and Latches
TEAM ZISSOU
presents….
“THE LOCATOR”
R. F. LOCATION SYSTEM
MIKE GOULD
KARA MCMILLIN
PEARLMAN CHRIS SINKEY
MARCUS
JACOB WILTGEN
R.F. Location Project
Compass Design
•
Transmitting Antenna
sends power signals
Receiving
Antennas
Power
• Antenna arrays receive
power signal
Rectifier
• Power is rectified and
amplified
Amplifier
•
DC power signal is
analyzed
68HC11
Microcontroller
•
2-D Location outputs to
Computer, LCD, or PDA
•
Bill Murray still confused.
Transmitting
Antenna
USB
Interface
Antenna Array Block Diagram
Receive
Antenna
Transmitter
DC
Converter
A/D
Microcontroller
6
System Block Diagram
Antenna 1
8
Antenna 2
8
Possibly:
Construct
Antenna 3
8
PC
Location
Algorithm
Output:
Display
Output:
Direction
Antenna Array Design
λ/4(1/ε )
r
50 Ω line
Digital Control pins
Phase Shifters
+
Shottky Diode / Rectifier / Filter
Phase Shifter Pin-out
QuickTime™ and a
TIFF (LZW) decompressor
are needed to see this picture.
QuickTime™ and a
TIFF (LZW) decompressor
are needed to see this picture.
10 deg
0 deg
30 deg
Receiving Array:
5 Element Power Pattern
20 deg
40 deg
0 deg
30 deg
10 deg
20 deg
40 deg
Receiving Array:
7 Element Power Pattern
Rectification to Amplification:
2.4-2.5 GHz Power Signal rectified immediately
Using a Schottky Diode: Surface Mount Low Barrier X-Band:
MACOM part # MA4E2054
RF input
On Antenna Board
DC output
To control Board
Schottky Diode output will be a low level DC Voltage
(~mV)
Amplification must take place to guarantee proper A/D
conversion:
Amplification using LF356 op-amp (easy, low noise, cheap)
Antenna Signal Filtering:
Implementing a LF356 op-amp to
create a “Sallen-Key” Low Pass Filter
Design fc = 5kHz
Additional LPF with RC filter
MC68HC11 A/D
One of 8 channels implemented (PE0: pin59)
OPTION control Register:
on start-up
$1039 (enable A/D):
ADPU: A/D Power Up: (1) Enables A/D capabilities
CSEL: Clock Select Enable: (0) Use E Clock (2Mhz)
A/D Control/Status Register: (ADCTL)
$1030 (Define A/D parameters): __000000
SCAN: Continuous Scan Control bit: (0) not used
MULT: Multiple-Channel Control bit: (0) single channel used
CD,CC,CB,CA: Channel Select Bits: 0000 = PE0
Processor, Bus Driver, and Latches
Chip Select, EPROM, SRAM
Antenna Control
Communication with
Peripherals
RS-232 interface with user
Use a CAN bus to link antennas
A balanced, 2-wire interface running over a
Shielded Twisted Pair
NRZ encoding reduces disturbances
CAN bus
RS-232
Software Executive
Main Loop
Task specific - latch data gathered on command
Subtasks
Read data on latches
Compare data from latches to determine highest power
reading
Find a location with a simple distance algorithm:
Antenna 1
z
Antenna 2
ø
* Know Z and ø, can find d
Transmitter
d
Output visual display on a dummy terminal for user
Updated Schedule:
Labor Division for 1st Milestone
Chris
Antenna designed and tested (including Shottky diode)
PCB board submitted for build
Jake/Kara
Control board running and tested (inputs and outputs)
Begin software implementation
Mike
Ordering phase shifter and Shottky diode
Amplifier designed and tested on control perf board
Marcus
Transmitter designed and tested
Wire-wrap the transmitter on a perf board
COSTS
(EXPECTED)
Received $1191 from UROP
Phase Shifters cost
Need 5 shifters per array = 5*2*72.50
PCB boards 33.00*3
General supplies used thus far
1191
-725
-99
-100
Wire wrap, resistors, caps, chips, etc.
Remaining funds
= 267
Questions?