 | | Re: how does a bar code reader work? —Ben Jackson
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| | | This is going to be tricky without real arrays. LegOS may be the only option. You'll be looking for a start symbol (maybe just one framing bit, sometimes a legal character in the barcode set and sometimes just a pattern). Once you identify it you (...) (25 years ago, 30-Dec-99, to lugnet.robotics, lugnet.trains)
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| | | | | RE: how does a bar code reader work? —Ralph Hempel
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| | | | | (...) Hmmm, this might be another practical pbForth application. I don't have time right now... <snipped excellent barcode type description> (...) I'm not sure about the clock thing. Any single sensor is sampled at about 333 Hz. If you write some (...) (25 years ago, 30-Dec-99, to lugnet.robotics, lugnet.trains)
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| | | | | | | Re: how does a bar code reader work? —Andy Gombos
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| | | | | | On the lego website they have RIS 1.5 programming hints. I just saw that there is a card reader that scans slips of paper with lines on it. I was thinking that the same idea could be used for these trains, since lego already has the basic (...) (25 years ago, 1-Jan-00, to lugnet.robotics)
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| | | | | barcode reader for RCX (was: how does a bar code reader work?) —Ben Jackson
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| | | | (...) Well, I tried this, and it's hopeless. The RCX can't poll the sensor nearly fast enough, and even if it could you'd need a lens to focus the sensor better. (...) Instead of using my idea, I took the suggestion of someone else and just used a (...) (25 years ago, 30-Dec-99, to lugnet.robotics, lugnet.trains, lugnet.robotics.rcx)
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