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Hi all, I'm a 4th year computer science student and have just developed an add on to the RCXPort API for mindstorms control for the purpose of using with standard ML as part of my 4th year project. The website is www.dcs.ed.ac.uk/~kv...oject.html (...) (23 years ago, 25-Feb-02, to lugnet.robotics.rcx.java, lugnet.robotics.rcx)
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| | Re: Connecting a non-Lego motor with external battery to the RCX
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(...) If the motor runs on 9V anyway, just hook it up to RCX directly (assuming it only draws 500ma). If it needs more than that, hook an external battery up to it via a power transistor (either bipolar or FET). You'll need a resistor in series with (...) (23 years ago, 17-Feb-02, to lugnet.robotics.rcx)
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| | Connecting a non-Lego motor with external battery to the RCX
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I need to connect a non-Lego motor to the RCX, and use an external power supply such as a 9V battery to drive the motor. Any suggestions as to how I should do this? (23 years ago, 16-Feb-02, to lugnet.robotics.rcx)
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| | Re: Using USB Tower with Alternative Firmware
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Hi, AFAIK only the following changes need to be made to a COMM-driver to work with USB (Windows only): First of all the Lego-USB-Driver has to be installed (happens automatically when you install the MindStorms/RIS-software). (In Control Panel the (...) (23 years ago, 16-Feb-02, to lugnet.robotics.rcx)
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| | Re: Power to RCX
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(...) Yes, but any regulator would convert power uselessly into heat, probably too much if you use a much higher voltage and draw some current. It would be better to use higher voltage motor controllers directly (if they exist). And of course this (...) (23 years ago, 14-Feb-02, to lugnet.robotics.rcx)
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| | Re: Power to RCX
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(...) Utter nonsense until you destroy the controller itself. Remember, while the Lego motors can take a fairly substantial voltage without being destroyed, the same is not true of the motor controller within the RCX. There is a voltage limit for (...) (23 years ago, 14-Feb-02, to lugnet.robotics.rcx)
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| | Re: Power to RCX
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(...) Yeah!!! That's exactly what I wanted to know! (Aka "How to connect RCX for dummies" (that's what I am - electronics isn't hobby of mine) Thanks a lot! Have a nice day Rob (23 years ago, 13-Feb-02, to lugnet.robotics.rcx)
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| | Re: Power to RCX
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(...) Putting a regulator in front of the motor controllers would be utter nonsense IMHO. (...) Plus the data sheet of the motor controllers. Jürgen (23 years ago, 13-Feb-02, to lugnet.robotics.rcx)
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| | Re: RFC: Creation of Version 0.2.6
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(...) Excuse my ranting, but... Bricx-anything doesn't appeal to me (1); I'm not fond of the "cx" pronounced at the end. Why not "Brick" or "Brix" instead? BrixCC and BrixOS work, as do BrickCC and BrickOS. Ian (1) I dunno why; but it's a (...) (23 years ago, 13-Feb-02, to lugnet.robotics.rcx)
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| | Re: Power to RCX
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There is a difference between a voltage regulator (which limits the maximum voltage applied to a circuit) and a rectifier (which turns AC into pulsed DC - to be smothed out by a capacitor - it also ensures that you can't connect a DC power source (...) (23 years ago, 12-Feb-02, to lugnet.robotics.rcx)
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| | Re: Power to RCX
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(...) Sorry, I am little confused. Does it mean that everything LEGO did was REMOVING DC adaptor hole to make difference between 1.0 and 1.5 version ? (talking about RCX hardware) and therefore i can connect my wall AC/DC adaptor directly to that (...) (23 years ago, 11-Feb-02, to lugnet.robotics.rcx)
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| | Re: Power to RCX
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Success! It works now, and gives 9.2 volts according to the RIS software. You were right, I did have it backwards. Thanks. (...) (23 years ago, 5-Feb-02, to lugnet.robotics.rcx)
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| | Re: Power to RCX
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Regarding the data sheet for the Melexis MLX1040B that everyone is talking about, and which I've been looking for for years.... This link: (...) (URL) comes back as NOT FOUND The fact that some people are claiming to have seen it implies that it was (...) (23 years ago, 3-Feb-02, to lugnet.robotics.rcx)
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| | Re: Power to RCX
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"Matthias Jetleb" <Jetleb@Netcom.ca> wrote in message news:3c5b6892.134862...net.com... [snip] (...) Check out this timely post: (URL) this is indeed the same part, then it looks like 12V is the max. (Figure 1 of the datasheet is a little confusing, (...) (23 years ago, 2-Feb-02, to lugnet.robotics.rcx)
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| | Re: Power to RCX
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I investigated this issue a while back an have taken apart all four of my RCX's (1.0 w. adapter, 1.0 w/o adapter, and 2 2.0's from an RIS1.5 and and RIS2.0). They all have internal voltage regulators. I've written the number down somewhere on this (...) (23 years ago, 2-Feb-02, to lugnet.robotics.rcx)
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| | Re: Power to RCX
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(...) Oops, me bad, I meant 7809. BTW, here are some links to online data sheets for that type of regulator: (URL) (23 years ago, 2-Feb-02, to lugnet.robotics.rcx)
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| | Re: Power to RCX
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Hi Trevyn, From the photo you posted, it appears that you have the input and output pins of the 7805 reversed. According to the datasheet, this will probably fry the regulator. I'd recommend getting a new part before continuing, so as not to risk (...) (23 years ago, 2-Feb-02, to lugnet.robotics.rcx)
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| | Re: Power to RCX
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Most "wall wart" transformers give about 3-5 volts above what is marked on them. I would not use one of these directly. However, I am currently working on using a 7809 voltage regulator. If you don't know, a voltage regulator is a small electronic (...) (23 years ago, 1-Feb-02, to lugnet.robotics.rcx)
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| | Power to RCX
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Hi all, I just got my new RIS Ver.#2, and I am far from being an electronic expert. I am wondering if a proper wall tranformer with an adapter inside the RCX to connect to the battery terminals would work for stationary application. Of course, I do (...) (23 years ago, 1-Feb-02, to lugnet.robotics.rcx)
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| | Re: Downloading Firmware
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(...) I have an E-machine that uses Windows 98. Mark (23 years ago, 31-Jan-02, to lugnet.robotics.rcx)
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