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(...) I agree that the "software" solution in an HC11 is limiting. It is this limitation that I am trying to overcome in hardware. Rather than shift a bit-pattern out for PWM, I would use three of the built-in timers to accomplish the task. One (...) (28 years ago, 27-Jun-96, to lugnet.robotics.handyboard)
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| | Re:
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(...) Actually an 'HC11 isn't a very efficient PWM controller. However a Microchip PIC is. (or a Motorola 68HC05, or a Siemans 87C752, etc) These single chip microcontrollers are both cost effective and easy to use. In the July (or August) '95 issue (...) (28 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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My earlier posting has left me thinking.. (Suprise!) A MUCH more efficient way of doing PWM would be to use another 'HC11. The counter-timer circuits are perfect for the job, and the SPI would serve just fine for communications. Of course, this (...) (28 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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What's Happening?? (Or, trying to spark some interaction) I currently am working on a few hardware projects for the Handy-Board.. As I may have described earlier.. Current projects include 4 boards, each on a PC slightly smaller than the (...) (28 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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| | Re: ??
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(...) Ahh, well that's good, and bad. :-) C'mon everyone, what's everybody _doing_ with their handy board? Letting it sit on the desk, beeping and collecting dust? (28 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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Just curious if something is wrong, I haven't gotten mail from the list in quite some time. (4 or 5 days) (28 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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| | 6811 Suppliers
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I just bought a MC68HC11A1FN from BG micro for $7.99 you can find them at (URL) ,,, (o o) ===...===oOO==(_)==OOo===...=== "Its difficult to work in groups when you are omnipotent...." -Q (URL) Mike Downey mdowney@eng.ua.edu (URL) .oooO Oooo. (URL) (...) (28 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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| | Re: downloading
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(...) I would say you should check for a short between the E Clock and another trace. Curt Mills, WE7U. hacker@tc.fluke.com archer@eskimo.com we7u@we7u.ampr.org (URL) (28 years ago, 21-Jun-96, to lugnet.robotics.handyboard)
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| | downloading
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I, too, have had problems downloading pcode to the latest handy board I have built. I have replaced every ic with the ic's from a working handy board, and have tested each trace from all 4 of the ic's that were installed (6811, 132, 62256 and the (...) (28 years ago, 21-Jun-96, to lugnet.robotics.handyboard)
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| | handyboard
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hello, i wrote a mail about an hour ago. this message was not really complete. i shall explain the problem. i am a student electrical engineering at the uneversity of twente, the netherlands. we were ordered to design something. we decided to built (...) (28 years ago, 20-Jun-96, to lugnet.robotics.handyboard)
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| | handyboard
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hello, I am building a handyboard, but at the moment it doesn't work. what voltage does the motorala 6811 need? grtz laurens (28 years ago, 20-Jun-96, to lugnet.robotics.handyboard)
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| | Re: photocell arrangement
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About photocells... I did this once and used some of the stuff that Rodney Brooks et al were working on with subsumption to build the ultimate "bug". It was a tiny cockroach type robot with a small FM wireless microphone strapped to its back. The (...) (28 years ago, 20-Jun-96, to lugnet.robotics.handyboard)
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| | Re: photocell arrangement
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(...) It seems as if your unwanted light is mostly going to be coming from above your bot. It also seems that the tubing that you have around the photocells has made the light detection too directional. (Is that what you want?) With the two cells on (...) (28 years ago, 19-Jun-96, to lugnet.robotics.handyboard)
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| | photocell arrangement
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I'm experimenting with photocells, and I'm looking for some feedback from anyone who's got some insight or experience with this sort of thing. Essentially, I have two photocells, both facing forward, on the left and right side of my robot. I'd like (...) (28 years ago, 19-Jun-96, to lugnet.robotics.handyboard)
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| | Re: IR output
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(...) 800 mA. Just don't short it out and you'll be fine. -Fred (28 years ago, 19-Jun-96, to lugnet.robotics.handyboard)
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| | IR output
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Can anyone tell me what the max current the IR output Darlington can handle? I need 100ma each for two high output IR emitters and I don't want to let the smoke out of the Darlington switch. Anyone? Thank you Larry ***...*** Larry Randall ***...*** (...) (28 years ago, 19-Jun-96, to lugnet.robotics.handyboard)
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| | SPI newbie question
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Forgive the newbie question, but I have an assembly program developed for the 6811 EVB that uses the SPI which I'm trying to rewrite in Interactive C for the Handyboard. However, I'm not sure if or how IC can access the SPI. I just need the SPI to (...) (28 years ago, 18-Jun-96, to lugnet.robotics.handyboard)
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HELP (28 years ago, 17-Jun-96, to lugnet.robotics.handyboard)
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| | Re: Definitions of VM and Bytecodes used by Interactive C
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(...) It seems like this might be a good thing to do - create a document of all of the pcode bytecodes. Another thing that might be usefull is a document describing the serial line protocal that IC uses. I have had need for both of these in the (...) (28 years ago, 17-Jun-96, to lugnet.robotics.handyboard)
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| | docs for pcode
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(...) If you're interested in learning what the various pcodes do, or in making a new development environment which backends to the pcodes, I'd recommend looking at "pcodesim.c" in the libs directory of the IC sources. This is a fairly (...) (28 years ago, 17-Jun-96, to lugnet.robotics.handyboard)
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