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Oh yeah, I forgot to add my usual disclaimer for things of this nature: Do it at your own risk. If things aren't connected up quite right, you could fry your RCX. To be safe try the circuit first by connecting it to a 9v battery box (try both (...) (22 years ago, 30-Aug-02, to lugnet.robotics)
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| | Re: Use RCX motor output to switch devices
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Thanks for the help, Mark! I have a few questions still (I'm a novice at electronics). (...) I live in The Netherlands, so instead of Radio Shack I buy at Conrad. Is there a universal transistor description in this case? (...) What does "in (...) (22 years ago, 30-Aug-02, to lugnet.robotics)
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"Da Byte" <dabyte@hotmail.com> wrote in message news:H1nuMp.CMK@lugnet.com... (...) Try looking for 2N2222A. 2N4401 should also work. They're both fairly common. (...) overheating. (...) Sorry... basicly, it means "fully on". When the transistor is (...) (22 years ago, 30-Aug-02, to lugnet.robotics)
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| | Re: Use RCX motor output to switch devices
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In an e-mail Eric send me the following info, for which many thanks. -----Oorspronkelijk bericht----- Van: Da Byte [mailto:dabyte@hotmail.com] Verzonden: vrijdag 30 augustus 2002 16:23 Aan: lugnet.robotics@lugnet.com Onderwerp: Re: Use RCX motor (...) (22 years ago, 31-Aug-02, to lugnet.robotics)
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| | Re: Use RCX motor output to switch devices
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(...) This appears to be a PNP transistor according to this datasheet: (URL) transistor in the circuit diagram I provided is NPN. Also, the maximum current the BC557 can handle is only 100ma (I think you needed 250ma or so). In other words, this (...) (22 years ago, 3-Sep-02, to lugnet.robotics)
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| | Re: Use RCX motor output to switch devices
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(...) Can't I secure my circuit against this 'switch', or even use it to achieve the same with output in both directions: by using diodes for example? I have tried to model something like that in software called "Crococlips" (screenshot: (URL) >To (...) (22 years ago, 4-Sep-02, to lugnet.robotics)
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| | Re: Use RCX motor output to switch devices
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(...) (URL) (22 years ago, 4-Sep-02, to lugnet.robotics)
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| | Re: Use RCX motor output to switch devices
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In response to the following, Ran Talbot e-mailed me. (...) "A "full-wave bridge rectifier" (as used in AC-to-DC power supplies) will do that nicely. I believe some of the Lego "active" sensors do this. I don't know if anyone makes an AC (...) (22 years ago, 8-Sep-02, to lugnet.robotics)
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| | Re: Use RCX motor output to switch devices
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Also, in the meantime I have built quite an attractive solution using a small relay, that has been built into a Lego 'mailbox'. I will post a little tutorial on my site on building it, because I am rather charmed by the simplicity and robustness of (...) (22 years ago, 8-Sep-02, to lugnet.robotics)
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| | Tutorial: use RCX motor output to switch devices / build your own interface
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(...) I hope this tutorial will give you some good ideas of your own too! It can be found here: (URL) please e-mail me with your comments or mistakes in the tutorial, or post it here. Have fun, Remko (22 years ago, 11-Sep-02, to lugnet.robotics)
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