 | | Robotic Wheelchair
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Anybody catch the segment last night on the robotic wheelchair. I think it was on Dateline. Watching it climb stairs was impressive, but seeing the chair stand upright on two of its four wheels while the occupant caught a 25lb sack of lead, all (...) (25 years ago, 1-Jul-99, to lugnet.robotics.handyboard)
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| | Help needed with bootstrap mode
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I have a problem getting handy board into bootstrap mode. I'm now in the face six (installing lcd screen and downloadin ic). It worked earlier, but now it just won't go into bootstrap mode. I have tested the switch and traced wires from it to the (...) (25 years ago, 1-Jul-99, to lugnet.robotics.handyboard)
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| | Subject information
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This is a side issue, I know, but there seems to be a lot of mail recently without a subject. Please try to include a descriptive subject for your posts. (...) (25 years ago, 30-Jun-99, to lugnet.robotics.handyboard)
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can the 68hc811e2fn be used insead of hc11a1fn? what mods would i have to make? thanks phil (25 years ago, 30-Jun-99, to lugnet.robotics.handyboard)
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| | Re:
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Fernando: This is not too much information to go by, but here are some thoughts. 1. If you use MS Windows 95/98/NT hbdl is your best bet as a downloader, since dl or dlm hang up under these OS's, even in a MSDOS terminal window. dl and dlm work (...) (25 years ago, 30-Jun-99, to lugnet.robotics.handyboard)
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We had been building a handyboard(hb) but we have severe problems, We download the buffalo using the hbdl windows downloader (dl indicates a serial timeout, dlm just hangs up). When Buffalo is succesfully loaded (it sometimes halts with a error in (...) (25 years ago, 30-Jun-99, to lugnet.robotics.handyboard)
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| | Re: Moving Straight
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So far nobody has mentioned using a compass to control the 'bot's heading. (URL) Nick (...) (25 years ago, 29-Jun-99, to lugnet.robotics.handyboard)
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| | RE: LM35 Temp Sensor
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The output pin of the LM35 gives you the ambient temperature in 10mV/degree C directly. The 47k pullup resistor will form a voltage divider with the output. You either have to do some conversion (complicated) or eliminate the pullup (easy).... Paul (...) (25 years ago, 29-Jun-99, to lugnet.robotics.handyboard)
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| | RE: Moving Straight
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Our first challenge was to get our robot to move ahead straight. There seemed to be a difference in the motor torques. We used shaft encoders and compared the counts every 200 to 500 milliseconds. Slowing down the motor that had a higher count, for (...) (25 years ago, 29-Jun-99, to lugnet.robotics.handyboard)
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| | RE: Moving Straight
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Many people use trial and error to come up with a wheel differencial factor that should always be applied so that even without looking at the encoders the robot should move pretty straight. If you do the compensation on the fly that is OK but during (...) (25 years ago, 29-Jun-99, to lugnet.robotics.handyboard)
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