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August 2010. Technical Topics for Teams. BEST GAME RULES. SAFETY FIRST. Safety glasses (Team supplied) Hearing protection “ Dust mask “ Buddy system Keep work area clean Supervise students at all times Read your power tools owner’s manual. - PowerPoint PPT Presentation
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Technical Topicsfor Teams
August 2010
BEST GAME RULES
SAFETY FIRST
Safety glasses (Team supplied)
Hearing protection “Dust mask “Buddy systemKeep work area cleanSupervise students at all times
Read your power tools owner’s manual
Use only the parts supplied in the Returnables and Consumables kits to build the robot
Items that are purely decorative such as paint, lights, decals, etc, may be applied to the robot, but not to Return Kit parts
The robot must fit into a two foot cube and cannot weigh over 24 pounds. The robot may expand after it exits the start box
You must use the supplied batteries and chargers The robots must be VEX Cortex controlled
Basic Information
Basic Information
Returnables kit must be returned at the conclusion of the competition unless the kit will be purchased
Do not modify or paint returnable kit parts except for servo horns and the toothed belt segment
All robots will be inspected for compliance with rules before the contest.
Robots may be inspected at any time a judge suspects that a robot is out-of-compliance
Batteries
Two 7.2 Volt, 3000 mAhrNiMH chargeable batteries
Six 1.2 Volt, 800mAhr NiMH chargeable AAA cells
One standard 9 Volt battery
Manage your batteries carefully!– Turn power off when robot is not running– Recharge batteries when robot performance first
indicates a drop in power.– Minimize number of charge cycles
Team-owned batteries are not allowed on the field on game day
Batteries
Battery Chargers
Chargers are included in the return kit Read charger instructions and follow carefully! Battery will become warm during a charge If a battery becomes hot during a charge,
disconnect from charger immediately! Batteries can explode!
Two blue 7.2 Volt batteries are included in the Return kit
Only one battery can be connected to the robot
Both batteries may be charged at the same time
the larger of the two power supplies works with the blue charger.
The 9 volt battery may be used for backup power via a special port on the Controller
Cortex Microprocessor Battery Charger
Battery charger for six re-chargeable AAA cells that power the Joystick
Do not try to charge standard AAA cells
The AAA cells are installed inside the Joystick unit and accessed with a small Phillips screwdriver
Only the smaller of the two power supplies works with the AAA cell charger
VEXnet Joystick Battery Charger
VEXnet Joystick
Joystick communicates with Cortex controller via wireless 802-11g
Two X/Y joysticks plus 12 programmable buttons
Ports on the back are:- Partner – phone cord to another Joystick shares control (buddy system)- Program – programming cable from PC USB port- Competition - ?
On/Off power switch
Back-side view
Top view802.11 Adapter
Cortex M3 VEXnet Controller
10 motor/servo ports
12 Digital I/O ports
8 Analog ports Two UART (data) portsOne 12C (sensor) port
Backup power port(9V battery)
Rx 2 Rx1 7.2 V battery port
On/Off Switch
802.11 Adapter
• 2 built-in speed controllers
• 2 external speed controllers
Cortex Controller Wiring Plan
Black, - Gnd Red, +White, Control/Signal
Two Wire Black – Red +
Black, - Gnd
Red, +5
White, control/signal
- Gnd
+ 5 V
Rx (clock for 12C
Tx (Data for 12C
VEX Control System
Switch
Servos
Small motor
Large motor
Large motor
Speed controllers
Install VEX Cortex with two screws not too tightly Provide easy access to VEX Cortex power switch
and battery The battery must be secured to the robot without
applying tape or adhesive to the battery Wire Red to Red (+) and Black to Black (-)
Recommendations
VEX Programming System
•EasyC or RobotC software must be installed on a laptop or PC.
•Programming may be downloaded to the VEX controller without disconnecting the controller from peripheral devices
Servos
•Connect to the VEX Controller
•Used to control microswitches, or drive mechanisms (like grippers, releases, etc.)
•Do not open or otherwise modify servos!
•You can change/modify the horns (wheels).
DC Motors
• Do not disassemble or modify motors
• Connections to motors should be made with crimped terminals from the consumables kit
• Reverse power connections to reverse direction of rotation
Power Switching
Motion Example
Example Robot with obsolete BRAIN
Wheel Hubs and Shaft Extenders
Recommended Tool List
Emerald Coast BEST Tool Kit RecommendationsItem Part Number Price
Drill Motor 3670 19.99
Multimeter 90899 4.99
Saber/Jig Saw 92772 29.99
File Set 7520 6.99
Terminal Crimper 92410 2.99
Drill Set 9475 3.99
Spade Drill Set 38597 5.99
Hacksaw 40766 3.99
Tool Set * 91507 44.99
Total 123.91
*Tool set includes measuring tape, screw drivers, sockets, wrenches, pliers, allen wrenches, hammer, etc.
Tool source is Harbor Freight. Equivalent tools may be purchased from other sources.