 | | transfer data failed
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Hi there, I use legOS 0.2.4 under Linux and tried (after a few weeks) to download the firmware and get always the follwing error: firmdl3/firmdl: transfer data failed Batteries are brand new, tower was set to short and long dist. nothing helped ... (...) (23 years ago, 6-Aug-01, to lugnet.robotics.rcx.legos)
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| | RE: SetWatch() only accepts constants
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Instead of sending ByteCodes from the PC and getting the RCX to interpret them, you can construct and send the SetWatch() OpCode plus the correct "constant" time and send it through Spirit.OCX (or directly, depending of the platform). (...) (23 years ago, 7-Aug-01, to lugnet.robotics.rcx.nqc)
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| | SetWatch() only accepts constants
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I just wrote a task and function that cause the RCX to receive data from the PC and then set the time on the RCX using SetWatch(). Unfortunately, I didn't realize that SetWatch() only accepts constants. NQC complained when integer variables were (...) (23 years ago, 7-Aug-01, to lugnet.robotics.rcx.nqc)
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| | Re: Rechargeable Batteries
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(...) Roger, I believe the low voltage is more important. A side issue is the battery indicator that you access through NQC (or Robolab) set up in a scale of 0-9 volts. Fully charged alkalines are 9+ and discharged ones are 6 volts. With NiMH full (...) (23 years ago, 6-Aug-01, to lugnet.robotics.rcx)
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| | Re: Rechargeable Batteries
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(...) They have a higher voltage of about 3V and are tricky to charge, if you don't do it right they have a tendency to explode. I've never seen standalone cells and charger. Jürgen (23 years ago, 6-Aug-01, to lugnet.robotics.rcx)
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| | Re: Rechargeable Batteries
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In article <3B69FD3A.3DA7E73A@c...ects.com>, "Frank Caggiano" <caggiano@crystal-objects.com> wrote: I'm surprised no one has mentioned rechargable lithium as used in, e.g., laptops. Rather expensive, but the hold a fair amount of charge. Would they (...) (23 years ago, 5-Aug-01, to lugnet.robotics.rcx)
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| | Re: Rechargeable Batteries
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Jerry: What is the problem with the NiMH batteries? the low voltage? Or extra $$ ? Roger (...) (23 years ago, 4-Aug-01, to lugnet.robotics.rcx)
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| | Re: Is this an error in legOS 0.2.5?
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(...) a (...) Maybe, if you wanted to be really flash, when you get the (non-ultra) low battery warning, your robot could start seeking out the tower, and get ready to send the data. Maybe have a light near the tower that starts flashing when it (...) (23 years ago, 4-Aug-01, to lugnet.robotics.rcx.legos)
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| | Re: Rechargeable Batteries
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(...) I use NiMH and get a voltage between 7.8V freshly charged and 7V at the low end (i.e. slightly higher than NiCd). The lower voltage is not really a problem for me. The motors may be somewhat less powerful, but if you're just playing and not (...) (23 years ago, 4-Aug-01, to lugnet.robotics.rcx)
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| | Re: SubVI help screens
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Yes you can create your own help screens, make your own command icon, etc. This is explained in detail in the "Elevator" chapter (Chapter 19) of my book "Creative Projects with LEGO Mindstorms". You can create your own help menu by double-clicking (...) (23 years ago, 4-Aug-01, to lugnet.robotics.rcx.robolab, lugnet.robotics.rcx)
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| | Re: Specs for Mindstorms gearmotor?
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I have pictures of the inside of the gear motor in chapter 7 of my book, "Creative Projects with LEGO Mindstorms". The motor is geared down by a factor of 13.56 --- 10 tooth to 44 tooth gear, then 12 tooth to 37 tooth gear. 12 tooth gear and 44 (...) (23 years ago, 4-Aug-01, to lugnet.robotics.rcx)
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| | Re: Rechargeable Batteries
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Hi Frank; Do you have a 1.0 RCX? If so you can do what I did. I used 3 4.5v battery rods with NiMh (9 total) and a custom wire to power my RCXs. It works great for me because I am using multiple RCXs off one power source (I have removed the RCX AA (...) (23 years ago, 4-Aug-01, to lugnet.robotics.rcx)
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| | Re: Is anyone using Java+RCX in their intro CS teaching?
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Yes, I will be using Java and the RCX in a course at Berkeley this fall. I used NQC last spring, but switched to java to use an OO language, get more space total memory and in particular more space for variables. And because a couple of my students (...) (23 years ago, 3-Aug-01, to lugnet.robotics.rcx.java)
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| | Re: Rechargeable Batteries
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(...) Nicads have a lower cell voltage (1.2 rather than 1.5), so they won't work very well in the RCX. Personally I use rechargeable alkaline cells (e.g. Ray-o-vac Renewal batteries). The downside to rechargeable alkalines are that they don't have (...) (23 years ago, 3-Aug-01, to lugnet.robotics.rcx)
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| | SubVI help screens
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I recently discovered the feature in RoboLab that lets you compact many program steps into one icon, using the command 'Create SubVI'. It's intuitive and easy to use. I suspect you can create help screens and change and label the icon it creates, (...) (23 years ago, 3-Aug-01, to lugnet.robotics.rcx.robolab)
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| | Re: about lnp_integrety_write
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(...) Hi, the function does exactly what the name says...it sends a LNP integrity layer packet of given length. Anyway the function seems to be unused. lnp_addressing_write() is e.g. used to send the acknowledges in program.c, which makes perfect (...) (23 years ago, 3-Aug-01, to lugnet.robotics.rcx.legos)
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| | Re: Rechargeable Batteries
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(...) Frank, I would *not* use Nicads or NiMH rechargeables. Their full-charge voltage is about 1.25V while alkaline batteries are about 1.55. I have Ray-O-Vac Rechargeable Alkaline batteries. They last several hours of operating time between (...) (23 years ago, 3-Aug-01, to lugnet.robotics.rcx)
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| | about lnp_integrety_write
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anyone know what this function does? i could get no reference to it under the legOS howto written by luis villa. ive tried sending messages both with it and without it and it seems to work anyways. regards kenneth johansen kennethj@stud.cs.uit.no (23 years ago, 3-Aug-01, to lugnet.robotics.rcx.legos)
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| | Re: Is anyone using Java+RCX in their intro CS teaching?
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(...) David, I cannot answer your question directly, but I have done some work which may be related to your interest. A while back, I wrote a small-scale Java application that simulated a 2-D mobile robot. The interactions between the simulator and (...) (23 years ago, 3-Aug-01, to lugnet.robotics.rcx.java)
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| | Is anyone using Java+RCX in their intro CS teaching?
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Hi all, Traffic is a little light in this group, so I thought I would see if any of its readers is doing anything with Java and the RCX in a particular area of interest that I have. There is quite a lot of intro Java teaching (including mine) that (...) (23 years ago, 3-Aug-01, to lugnet.robotics.rcx.java)
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