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 Robotics / 18645
    RE: Brainstorms —Ralph Hempel
   Wayne, In the spec you indicate that each brick gets its own 128 bit random number. This is like a serial number that is initially use to uniquely identify each brick with a shorter BrickID. This is a common technique in fire alarm systems where (...) (22 years ago, 10-Aug-02, to lugnet.robotics)
   
        RE: Brainstorms —Russell C. Brown [RR-1]
   This may be totally off-base--I'm not as techy as you guys--but the software biz has the idea of a universally unique ID (UUID, a.k.a. GUID for globally unique ID). It's a way of generating a unique number without any centralized management. Windows (...) (22 years ago, 12-Aug-02, to lugnet.robotics)
   
        RE: Brainstorms GUID —Bruce Boyes
   Quoting "Russell C. Brown [RR-1]" <rcbrown@austin.rr.com>: (...) Well, one easy answer is to use a Dallas serial number chip. They are way less than a dollar in quantity. Actually each 1Wire device has a guaranteed unique ID. Some have EE memory for (...) (22 years ago, 12-Aug-02, to lugnet.robotics)
   
        Re: Brainstorms GUID —Steve Baker
     (...) > somewhere must administer who gets what ID numbers. (...) The trouble with all these fancy approaches is that they all require additional logic. It might not seem like *much* additional logic - but if the goal is to fit most kinds of (...) (22 years ago, 12-Aug-02, to lugnet.robotics)
   
        Re: Brainstorms GUID —Wayne Gramlich
     All: I'm not sure I really understand what point is trying to be made. I thought that a globably unique id was a good idea and put them into RoboBricks. My choice was to use a 128-bit random number. There are other solutions. All of the other (...) (22 years ago, 12-Aug-02, to lugnet.robotics)
   
        Re: Brainstorms GUID —Bruce Boyes
   (...) Maybe I completely missed the point myself? I like your idea of intelligence so small it can fit into a brick, and then tie into upper levels of higher intelligence. That sounds like true distributed processing (a good thing) to me. Here's the (...) (22 years ago, 12-Aug-02, to lugnet.robotics)
   
        Re: Brainstorms GUID —Steve Baker
     (...) Presuming they can use different seeds, 32 bits is one chance of collision every 4,294,967,296 attempts. If they don't have random seeds then it doesn't matter a damn how many bits you have. The chances of collision on each reboot go up (...) (22 years ago, 13-Aug-02, to lugnet.robotics)
   
        Re: Brainstorms GUID —Wayne Gramlich
   (...) That's what we thought as well. (...) If you use a pseudo random number generator with the same seed you will get the same `random' number. The obvious answer is don't do that. I personally use the /dev/random device on Linux which collects (...) (22 years ago, 13-Aug-02, to lugnet.robotics)
 

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