 | | 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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| | Re: Moving Straight
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I use the 9 gram Piezo gyro in my Hand Launch Glider to keep it moving level despite strong wind conditions. Could you use that in your robot as a "Rudder" input? The 9 gram Piezo gyro costs about 9,500 yen here in Japan. That is about $80.00. I (...) (25 years ago, 29-Jun-99, to lugnet.robotics.handyboard)
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| | Re: Quickcams
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(URL) check these guys out they have done what your thinking... good luck phil (...) (25 years ago, 28-Jun-99, to lugnet.robotics.handyboard)
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| | new address
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hi all This note is to let you know that Josh Welber has a new email address. In future you should send mail to jaw@duckrabbit.org I will be canceling my interport address as of the 1st. Thanks josh (25 years ago, 28-Jun-99, to lugnet.robotics.handyboard)
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| | H- Bridges
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Have any of you got some experience with H-bridges? I want to use 2 digital outputs to toggle a motor on/off in 2 directions. Does this sound reasonable? if any of you have a lead on a good web resource, I'd appreciate the URL... K.M. (25 years ago, 28-Jun-99, to lugnet.robotics.handyboard)
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| | Re: Moving Straight
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Try a differential transmission (assuming you're using Lego parts). (2 URLs) motor drives the bot, with both wheels turning at the same rate. The other turns the bot by changing the relative speed of the wheels. Ross M. Tonkens, M.D. Medical (...) (25 years ago, 28-Jun-99, to lugnet.robotics.handyboard)
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| | Re: Moving Straight
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(...) Sorry, I do other things with my controllers than control robots (shame on me!). From other discussions I've seen though, I would think that you could use some feedback from the turning shafts, like optical turns counters or some such. I (...) (25 years ago, 28-Jun-99, to lugnet.robotics.handyboard)
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| | Re: Moving Straight
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Sean ... Probably the best way to maintain a constant heading is to use shaft encoders on both drive wheels ... monitor their rotation ... adjust one motor to give identical turn counts. The book "Mobile Robots: Inspiration to Implementation" by (...) (25 years ago, 28-Jun-99, to lugnet.robotics.handyboard)
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| | 6500 sonar
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A week ago I has using the sonar ranger with the expansion board but without connecting J12 to digital input 7. I had the sonar making the CLICKING sound (which is good) but the numbers that were being displayed onto the LCD were random (not good). (...) (25 years ago, 28-Jun-99, to lugnet.robotics.handyboard)
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| | Re: Quickcams
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Hi Ryan, The Robot Learning Lab at Carnegie Mellon's Robotics Institute has used Quickcams for vision applications. The URL is (URL) not sure how much info is available. But I know it can be done. Michael (...) (25 years ago, 28-Jun-99, to lugnet.robotics.handyboard)
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| | Moving Straight
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Is there anyone who has written or seen IC code that will keep a robot moving straight with 2 DC motors and four side sensors? 2 on each side. The main reason I ask is because one of my DC motors seems to put out more power that the other one and (...) (25 years ago, 28-Jun-99, to lugnet.robotics.handyboard)
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