Post on 06-Jan-2016
description
transcript
Mentors WorkshopElectrical Sub-System
Mark McLeodTeam 358Festo/Hauppauge H.S.
FFor
IInspiration and
RRecognition of
SScience and
TTechnology
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 www.innovationfirst.com/
Other Sources www.jameco.com www.mouser.com www.digikey.com www.future-active.com www.newarkinone.com www.radioshack.com
Simplified Circuit Diagram
12V SLA Battery
CircuitBreakerPanel
120A Circuit Breaker- +
Ground Stud
Robot Controller
Victor 884Speed
Controller
SpikeRelay
BackupBattery Modified Diagram by Steven Shade, Team 1111
Note: No control system wiring is included
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
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
Heavy components Delicate electronics (heat sinks) PWM and electrical connectors
Debugging techniques Projects
Battery charging station FIRST power connectors on battery charger Test bed
Typical Electronics Schedule
September thru December Develop basic skills
January thru March Six week build period
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