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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 (...) (29 years ago, 19-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 (...) (29 years ago, 19-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 (...) (29 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 (29 years ago, 20-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 (...) (29 years ago, 20-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 (...) (29 years ago, 21-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) (29 years ago, 21-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) (...) (29 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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| | ??
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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) (29 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? (29 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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| | (no subject)
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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 (...) (29 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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| | (no subject)
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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 (...) (29 years ago, 26-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 (...) (29 years ago, 26-Jun-96, to lugnet.robotics.handyboard)
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| | (no subject)
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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 (...) (29 years ago, 27-Jun-96, to lugnet.robotics.handyboard)
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| | Re:
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(...) Lyle, The following provide PLCC-to-breadboard adapters: Amaze Electronics Co. Tel: 1-800-996-2008 Web: www.hooked.net/users/amaze Technological Arts Tel: 1-416-963-8996 Web: www.io.org/~techart You can see their ad on the July 1996 issue of (...) (29 years ago, 27-Jun-96, to lugnet.robotics.handyboard)
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| | BCLR TFLG1,X %11111101?
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In the file encoders.asm, there's a section like: Port1_ShaftInt: LDX variable_port1_shaft_count [stuff deleted] BCLR TFLG1,X %11111101 RTI I'm trying to figure out what the BCLR line does. Why does it clear the bits of all the timers _except_ the (...) (29 years ago, 28-Jun-96, to lugnet.robotics.handyboard)
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| | (no subject)
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(...) I found this entry in the HC11 handbook, page 10-14. It may help.. "The most common way of clearing a status flag bit in the timer flag registers is to load an accumulator with a mask that has a one in the bit(s) corresponding to the flag(s) (...) (29 years ago, 28-Jun-96, to lugnet.robotics.handyboard)
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| | Re: your mail
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(...) And to add to all the confusion, see page A-15 of the same book, which contradicts what page 10-14 says. I followed he instructions on page 10-14 and it worked. Also remember those odd word-blitz methods of clearing a single bit only seem to (...) (29 years ago, 28-Jun-96, to lugnet.robotics.handyboard)
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| | Easiest way to add two more input and output compares?
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Well, I have ny Handyboard running a little lawnmower around, but I can only feasibly get two PWM signals in for processing and relaying on to the motor drivers. I need two more signals (drive and steering, all I'm doing now is camera pan/tilt) to (...) (29 years ago, 28-Jun-96, to lugnet.robotics.handyboard)
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| | hb basic questions.
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Well this is my first post and my first look at the handy board. I have a couple of basic questions, sorry if this is maybe asking for the obvious but I didn't find answers to these on the web nor in the archive. Anyway thanks already for all and (...) (29 years ago, 28-Jun-96, to lugnet.robotics.handyboard)
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