Home > Robots > Half Life > Latest Rules
 Latest Rules

The Rules: Assembly and Competition

by Peter Abrahamson and Christian Carlberg, September 1999

 Assembly Rules
1. A LEGO robot is defined as being a mobile base. It may walk, roll, crawl, or hop. It cannot be stationary and must be under wireless control.

2. LEGO bricks only! All parts must be produced by LEGO. LEGO parts must be used in their completeness, without the removal of any material. No modifying of LEGO parts (opening of motors, removal of fuses from the battery cases, heavier wire gauge, milling, drilling, treading shafts or dremeling etc.) with one exception:

  • Rubber bands, belts, string, and 1/16" bungee other than the ones supplied by LEGO may be used as long a it is no bigger in thickness and length than LEGO rubber bands, bungee or string. No cutting of rubber bands.
3. No glue! LEGOs must physically lock together with other LEGOs and no string, wire, or rubber bands may be used tohold the LEGOs together. Similarly, LEGO blocks may not be melted or joined together other than in the way they were intended. You must be able to completely disassemble your robot without breaking parts.

4. There are two classes of robots. Destroyer and Juggernaught.

  • Destroyer class is limited to 2 RCXs in the robot and no battery boxes.

  • Juggernaught class is limited to 12 motors for the drive platform.

5. Weight limit for both classes is 15 lb.

6. Walking robots weight limit is 30 lb., four RCXs in the Destroyer class and 24 motors in the drive platform in the Juggernaught class.

7. Robots must fit into a 18" X 18" X 18" volume at the beginning of the match. Extension by mechanical means to a larger size during the match is legal. There is no limit to the number of LEGO bricks you use or as long as you fit into the weight limit and volume.

8. All control must be done by using the LEGO RCX bricks. Hacking and reprogramming of the RCX brick by other software is legal. As long as the IR. transmissions do not interfere with another competitor's robot.

  • RCX IR Link Codes
    The RCX brick can send and receive 255 discrete commands over the IR port. Depending on the number of contestants, the command block will be divided up and distributed among the competitors. This is similar to bands in radio frequencies. If the number of contestants is large than follow the example below of elimination rounds below:

    Group 1
    command block           competitor
    1-16                    1
    17-32                   2
    33-48                   3
    49-64                   4
    65-80                   5
    81-96                   6
    97-112                  7
    113-128                 8
    129-144                 9
    145-160                 10
    161-176                 11
    177-192                 12
    193-208                 13
    209-224                 14
    225-240                 15
    241-255                 16
    Group 2
    command block           competitor
    1-16                    17
    17-32                   18
    33-48                   19
    49-64                   20
    65-80                   21
    81-96                   22
    97-112                  23
    113-128                 24
    129-144                 25
    145-160                 26
    161-176                 27
    177-192                 28
    193-208                 29
    209-224                 30
    225-240                 31
    241-255                 32
    Repeat the assigning of command blocks until all competitors have their bandwidths.

    Pair up everyone in group 1 then run elimination rounds within the group. Do the same for group 2 and group 3, etc. After each group has been paired down to 2 competitors then reassign the command block numbers and have all the finalist reprogram to the new bandwidth.

9. You may not build a second robot that was developed for a certain situation (i.e. you used your fast robot for the match but for your second match you use your slow robot). However, you may completely rebuild your robot between matches, time permitting. (see Competition Rules).

10. Modular weapons are allowed as long as they make up no more than 50% of your robot.

11.Projectile weapons are allowed. Don't hurt the spectators. Batteries may not be used as projectiles.

 Competition Rules
1. Matches will last no longer than 3 minutes.

2. All robots must pass an inspection before the event.

3. Physical rebuilds and repairs are permitted between matches as long as it does not conflict with the assembly rules. The robot must pass inspection after changes have taken place.

4. Software modification is permitted at anytime outside of combat. Downloading to your RCX brick is allowed only in the downloading area. Although the downloading area is designed to block accidental transmission to other RCX bricks, you should warn nearby competitors.

5. Your robot must start each match from a stationary position; nothing can be whirling or spinning and storing up kinetic energy. However, rubber bands can be pre stretched, the LEGO air tanks can be pre loaded, cosmetic and decorative pieces such as radar dishes turning, LEGO pistons and cylinders moving, light elements flashing, etc.

6. Jamming or taking control of another's robot is not permitted. Intentionally blocking IR. signal to your competitors robot is not permitted.

7. You (the competitor) may move around the arena space during the combat but you may not hinder other competitors movement around the area.

8. Winning will be determined by destroying or dominating your opponent. Pins and holds will not win the event; after 20 seconds of non action the robots will be broken up. In the case of no clear victor, the judges or the crowd will determine the winner.

As always, please use common sense.

Copyright © 1996-2001; Team Delta. All Rights Reserved. - Legal Information / Contact / Search