Transcript FIRST Mentor Workshop

For
Inspiration and
Recognition of
Science and
Technology
Mentors Workshop
Electrical
Sub-System
Mark McLeod
Team 358
Festo/Hauppauge H.S.
Objectives

FIRST Rules & Restrictions
 Official Suppliers & Other Sources
 Basics/Components
 Design Notes
 Potential Problems
 Keeping Students Busy
 Typical Schedule
 Sample Layout
FIRST Rules & Restrictions

Kick-off Rules
 FIRST Wiring Diagram
 Wire gauge
 Grounding
 Allowable divergence
 Part of $3500 limit (2005) on additional parts
 No single electronic component > $200
 Inspectors rule – volunteers and all that
implies
Official Suppliers & Other
Sources

Official Suppliers
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www.innovationfirst.com/
Other Sources
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www.jameco.com
www.mouser.com
www.digikey.com
www.future-active.com
www.newarkinone.com
www.radioshack.com
Simplified Circuit Diagram
Note: No control system wiring is included
120A Circuit Breaker
-
+
12V SLA Battery
Circuit
Breaker
Panel
Ground Stud
Victor 884
Speed
Controller
Robot Controller
Spike
Relay
Backup
Battery
Modified Diagram by Steven Shade, Team 1111
Basic Components
•Main battery (12v)
•Wire gauge – 6, 10, 16 & 24 awg
•Spikes (forward/reverse/off)
•Victor speed controllers (coast, brake, calibrate)
•Motors, fans, compressor
•Circuit breakers – 120a main, 20/30/40a panel
•Ground stud
•Control system (7.2v battery)
•Servos, solenoids
•12v sensors -- current, banner
•Motors
Design Notes

Diagram robot electrical layout
 Access to all components for test and
replacement
 Control System status lights and buttons visible
and accessible
 Battery mounted securely and is readily
removable
 Weight of wire -- short wire runs
 Crimp & solder, label all wiring, connections,
fuses
 Neatness counts – tie-up cable runs (electrical
tape for insulation only)
Potential Problems

METAL SHAVINGS (cover electronics)
 Blown components
 Welding robot frame w/electronics attached
 Wiring loose/poor connection (PWM cables too)
 Victor Speed Controller calibration
 Overheating motors -- additional fan cooling
 LockTite melts plastic – controllers, spikes
 Breaker resets from stalled or improperly
geared motors
Keeping Students Busy

Variations on robot electrical layout
 Develop basic skills
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Circuit basics, e.g., series & parallel
Advanced circuits, e.g., IR beacon, CMU camera, or
external processing circuit
Use of multi-meter
Learn to crimp & solder
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Heavy components
Delicate electronics (heat sinks)
PWM and electrical connectors
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Debugging techniques
 Projects
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Battery charging station
FIRST power connectors on battery charger
Test bed
Typical Electronics Schedule

September thru December
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Develop basic skills
January thru March
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Six week build period
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Robot design – space for electronics and wire runs
Motor/sensor requirements
Designing and testing solutions
Resolve physical layout
Integrating solutions with mechanical
Regional event

Inspection