Hardware Presentation David Anthony Outline CraneTracker Project Hardware Design Design Software Fabrication Process CraneTracker Needed connectivity for highly mobile target Limited energy reserves ID: 498795
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Senior DesignHardwarePresentation
David AnthonySlide2
OutlineCraneTracker Project
Hardware Design
Design Software
Fabrication ProcessSlide3
CraneTrackerNeeded connectivity for highly mobile targetLimited energy reserves
Long term mission
Light weightSlide4
CraneTracker CapabilitiesGSM Connection
Integrated GPS
Solid State Compass
Solar Recharging
Iris Connection
Lithium Polymer BatterySlide5
GSM ConnectionTelit GE-865 module
UART Communications
External SIM CardSlide6
GPS MediaTek MT-3329 Module
Integrated Antenna
NMEA 0183 Connection
Interchangeable with many other solutionsSlide7
Solid State CompassHoneywell HMC-6343Heading, pitch, roll
3D Acceleration
Temperature
Not just magnetometerSlide8
Solar RechargingMCP-73831Needed for
LiPo
battery
Not just for solar recharging
USB
Battery
7V MaximumSlide9
Iris Connection51 Pin Hirose DF-9Can be used with most motes in lab
Iris provides microcontroller, flash,
ZigBeeSlide10
LiPo BatteryCan use any single cell battery
Why
LiPo
?
High energy density
Flat discharge characteristics
3.7V nominal voltageSlide11
Design ConsiderationsConnectivity needsSensing needs
Processing & Storage
Power supply needs
Driven by other considerations
Possibly most challenging part
RF NeedsSlide12
ConnectivityMobilityCost
RangeSlide13
SensingWhat do your clients want?What do you need?
Had to add current and voltage detectors to crane projectSlide14
Processing and StorageKeep it simpleUse motes in lab if possible
Mission duration?Slide15
Power SupplyConsider your power sourceSnow plow, several options
Pheasant team, probably solar
What are the differences?
What are your power needs?
GSM has high peak power consumption
GPS is also power hungry
Microcontroller, compasses, are negligible
How sensitive are components?Slide16
Radio FrequencyCan be extremely difficultHard to replicate problems
Hard to testSlide17
Design ProcessCraneTracker was designed completely in
Altium
EE Department has licenses for the labs
Eagle is your best free solutionSlide18
Design Process Part 1Gather requirementsChoose components
Examine requirements of those componentsSlide19
Design Process Part 2Design schematicDefines logical connections
Does
not
describe physical layout
Mistakes made here are extremely difficult to correct
Plan to spend a lot of time here
Use independent reviews to ensure accuracySlide20
Schematic ViewSlide21
LayoutThe physical realization of your schematicNot as fun as it sounds
Correctly implemented schematics ensure the automatic rule checkers detect your problems hereSlide22
LayoutSlide23
PCB LayoutDefining different layers of boardFabrication process is like developing a photograph
Top & Bottom Copper
Silkscreens
SoldermasksSlide24
Design Rule CheckerThis will save youDefine the rules you want your design to conform to
Minimum widths
Neckdown
rules
Finds erroneous connectionsSlide25
Fabrication ProcessSo you’ve got a design…First question:
How much of the process do you want done?
How much of the process can you
afford
?
Who is going to make it for you?
In the past, have used Advanced Circuits
Based in Colorado, so fast shipping
Great student deals
Advanced Circuits can do whole board assembly
Best if you’re going to make a lotSlide26
Fabrication, cont.From your design, create Gerber files and NC drill filesMachine readable descriptions of your process
Each layer has its own Gerber file
Submit design to fab house
Most will run their own rule checker
Can produce many false positives
But when they don’t…
Wait 1-2 weeks
Anticipate this in your schedules
Find out everything you’ve done wrong
Go back
to beginning