 | | Cheap Mindstorms Motors
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I noticed that Toys R US in central Ohio have deeply discounted Lego Znap products. I bought a 3552 for $9.97 in Columbus (Hamilton Rd) last week. Today I picked up models 3552 and 3571 for $4.90 each at TRU in Heath! Each includes a 9V motor (...) (25 years ago, 9-Oct-00, to lugnet.robotics)
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| | Re: Why no 8450 or 8482 in US?
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I have sneaking suspicion it has something to do with the fcc and the use of the 27MHz model control band. As I understand it, use of the 27MHz band in the US specifically prohibits the transmission of data, while it isn't so stringent in this (...) (25 years ago, 9-Oct-00, to lugnet.robotics)
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| | motors
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I know this question came up before, but can someone please tell me the effiency of the motors included with lego mindstorms?? How to they compare to the avergae electric motor?? (25 years ago, 9-Oct-00, to lugnet.robotics)
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| | Re: programming the Hitachi H8... (newbie question)
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Thanks for the info Steve! I've read a little about NQC and LegOS and as you describe LegOS appeals to me for the raw low-level support it offers. (...) What do you mean "setup as a cross-compiler"? I'm not familiar with that process... Is there a (...) (25 years ago, 9-Oct-00, to lugnet.robotics)
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| | Re: Resistances of touch sensors and lamps
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I have been keeping an eye on this thread and feel compelled to add my observation and experience; The touch sensors tend to exhibit quite an extended range of resisitance values as they are depressed. I have a couple which start as high as 7k on (...) (25 years ago, 9-Oct-00, to lugnet.robotics)
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| | Re: programming the Hitachi H8... (newbie question)
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(...) Well, (I'm also a C++ programmer - with a similar background - who got a RIS for his birthday this year). There are two choices that suit people like you and I. The *simplest* is 'NQC' (Not Quite C) - which is a *small* C subset that compiles (...) (25 years ago, 9-Oct-00, to lugnet.robotics)
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| | programming the Hitachi H8... (newbie question)
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Hi, I am new to Lego Mindstorms and just got a RIS 1.5 for my birthday. Let me start with a brief background info on myself: By profession I'm a C++ programmer who does COM+ development. I'm not a formally educated computer scientist however (no CS (...) (25 years ago, 8-Oct-00, to lugnet.robotics)
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| | Re: need advice on joining....
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Amnon: Thanks. Your right. that did the trick. I used your idea in conjunction with a part that I found in the cybermaster set. I just searched the element registry and could not find it. it has 2 friction pegs on the bottom, and forms a triangle (...) (25 years ago, 8-Oct-00, to lugnet.robotics)
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| | Resistances of touch sensors and lamps
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Hi all, I played around with touch sensors and a lamp this weekend, trying to measure their resistance. Since my Ohmmeter proved rather unreliable, the values keep wandering around and it seemed zero was not well adjusted, I just took a look at the (...) (25 years ago, 8-Oct-00, to lugnet.robotics)
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| | alternate uses for IR port...
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can the IR port used to send messages to the RCX also be used for other applications? in other words should i even bother trying to use the IR module hooked up to my computer for other devices or should i expect it to be proprietary. and if it is (...) (25 years ago, 8-Oct-00, to lugnet.robotics)
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| | RCX, Servos ,and Pneumatics
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Hi All, I've just updated my site with new information on controlling standard RC servos with the RCX. Besides the dead-simple schematic that uses Radio-Shack parts, you can even control pneumatic switches! There are a few pictures that show a (...) (25 years ago, 7-Oct-00, to lugnet.robotics, lugnet.robotics.rcx, lugnet.robotics.rcx.pbforth)
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| | Re: NQC versus Lego RCX Code Speed
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Yes, this explains my observations perfectly! I will probably set up some more experiments--attempting to exactly duplicate the function of my oddly-behaving RCX Code (my currently-running NQC program is very close already), and try to get some real (...) (25 years ago, 7-Oct-00, to lugnet.robotics)
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| | Re: need advice on joining....
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Use the light gray pegs that have a 1-length dowel on one side and a stud on the other side. These convert holes to studs, so it is easy to make the joint you want. Put one stud next to the cross axle hole in the bend angle beam, skip two holes, and (...) (25 years ago, 7-Oct-00, to lugnet.robotics)
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| | Re: Vision command and Mac
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Have you tried using Virtual PC (or Real PC)? I believe that Virtual PC at least supports some USB devices, maybe the Camera is supported. BTW, has anyone thought of extending NQC --or any of the other alternative RCX programming environments-- to (...) (25 years ago, 7-Oct-00, to lugnet.robotics)
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| | need advice on joining....
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Help I am building a gripping mechanism and am using pneumatics to do the squeezing. Due to the orientation of the hole on the base of the cylinder I was "forced" to attach a beam in such a way that is now puts me in a bind. The beam in question (...) (25 years ago, 7-Oct-00, to lugnet.robotics)
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| | Re: Dropping your RCX on the floor...
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Having had to dismantle an RCX at one stage, I would point out that the battery connectors are not solidly attached to the main circuit board inside the RCX. (I have noted a lot of Lego electrics are built along those lines - relying on mechanical (...) (25 years ago, 6-Oct-00, to lugnet.robotics)
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| | Re: NQC versus Lego RCX Code Speed
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(...) With regards to your comment about sensor watchers, yes they are slow. If I remember correctly, they are implemented by a task that loops forever polling the sensors and starting other tasks whenever an event of the proper type occurs. Tasks (...) (25 years ago, 6-Oct-00, to lugnet.robotics)
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| | Re: Is Extreme Creatures Good?
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(...) If you can find <set:6979> on clearance at TRU for $30, it's arguably a better deal, since it also has a Micromotor. It's not Technic, but my feeling is that the parts in it have more potential for making "pretty" bots. Ran (25 years ago, 6-Oct-00, to lugnet.robotics, lugnet.technic, lugnet.market.shopping)
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| | Re: Cheap pyroelectric sensor
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Ah hah! That's where they come from! I had seen the $40 ones mentioned in this news group a while back and then found Walmart selling complete motion detector systems for $8. So I bought a couple and pulled the sensors out. So they only cost $4! (...) (25 years ago, 6-Oct-00, to lugnet.robotics)
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| | Cheap pyroelectric sensor
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Hi all, Somebody pointed out to me a REALLY inexpensive pyroelectric sensor, to be found here: (URL) specs are here: (URL) he was asking if the sensor can be used with my interface circuit, to be found here: (URL) answer is no, at least not without (...) (25 years ago, 6-Oct-00, to lugnet.robotics)
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