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 | | Re: addendum
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| Ahah. due to the arcane way printing to the lcd screen is implemented, all interrupts must be turned off each time a character is written to the lcd. apparently this conflicts with the servo routines. i'll look into it and see if there is a (...) (28 years ago, 21-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.060)
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| | Re: power and servo
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| [problem 1: voltage on motor chips when no motor voltage applied] This is normal, because the motor chip INPUTS have +5v signals on them. These signals "bleed" into the motor chip power supplies. This isn't dangerous, but it isn't particularly good (...) (28 years ago, 16-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.059)
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| | Re: dual servos
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| There may be two separable issues in your experiment: 1. "twitching" when the control value isn't changing. this should not happen. 2. twitching because of flakiness in the pot reading. this would not surprise me at all. if the A to D reading on the (...) (28 years ago, 16-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.059)
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| | Re: (BrainDead) servos
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| Please see the Servo page, linked off of the Software Resources page: (URL) you load the drivers, and connect the servo to power, ground, and a control output. -Fred In your message you said: (...) (28 years ago, 15-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.059)
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| | Re: Long Distance Communications
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| RF modems. These are 9600 baud and up serial links with just that range. Cost tends to be $500 per. I don't know of any brands I can recommend off-hand. Try a net search? -fred In your message you said: (...) (28 years ago, 15-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.059)
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| | Re: Pins Y0-Y5 addresses
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| Info on how to use these pins is explained in the Appendix B of the 6.270 manual. The HB and the 6.270 have the same memory/digital I-O circuitry. Look in the Tech Docs link off the main page. -Fred In your message you said: (...) (28 years ago, 15-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.059)
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| | Buncha bouncebacks
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| Fred, I get a bunch of bounce-back messages when I post to this mailing list. Apparently many of the addresses have gone bad. It doesn't really matter, I just delete them, but how does one, as a mailing-list administrator, deal with address (...) (28 years ago, 29-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.059)
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| | Re: HB Downloader Trouble
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| Success on the first bootstrap download and failure to write into RAM could easily be explained by a fault in the memory circuit. The memory circuit, which includes the 'hc373, the 'hc132, and the RAM chip itself, with about 27 signals going to the (...) (28 years ago, 13-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.059)
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| | Re: High power motor drivers
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| Keith Check the HB home page. Fred posted my info for a H-bridge that will handle two 12V-55V motors at 3A each. I know it's not exactly a custom bridge, but you can make the PCB from scratch. The LMD18200 from National makes this really easy. (...) (28 years ago, 28-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.059)
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| | Re: pink book
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| See the Handy Board Technical Documents page, linked off of the main page. It's the MC68hc11 reference manual. It's no longer free, but it's really inexpensive (like $2.50 per copy). This is a 200+ page book, extensive, in depth, and well written. (...) (28 years ago, 10-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.059)
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| | memory not remembering...
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| I'm stumped. In the process of assembling my first handyboard, I have just reached the stage where I install the memory (all previous checkpoints passed). The computer successfully downloads the bootstrap, sets the config register correctly, and (...) (28 years ago, 26-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.059)
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fred
(score: 0.058)
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| | Re: Rayovac Renewal batteries
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| Renewals are pretty cool -- they are "true" alkaline in the sense that they have the same voltage, discharge curve, and shelf life. The only bugaboo with them -- and it's a big one -- is that each *cell* must be individually charged. so you can't (...) (28 years ago, 5-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.058)
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| | dual servos
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| Good Day, A consensus seems to be emerging among those who know more about pcode interrupt structure than I. The printf function does indeed disable the interrupts and run that way for quite a long time. Thus, the servo twitching seems to be mostly (...) (28 years ago, 21-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.058)
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| | RE: dual servo update
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| Two things to note in the servo investigation: (...) This supplies a reserve of current to the servos, and that allows them to seek to their desired position faster. (...) Two servos, when moving, can pull two AMPS of current. Thats 2000mA. Two (...) (28 years ago, 21-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.058)
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| | Re: pcode downloading
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| (...) OK, well I think it is isolated at the pseudo-MAX232 chip. Did you get the +10 v power supply pin on the p-MAX ok? It's at pin 2. Measure it w/r/t ground and you should get +10v. Before you order a real Maxim, check the polarity of your (...) (28 years ago, 3-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.058)
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| | Re: pcode downloading
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| Here is the relevant part of the test instructions: Finally, the MAX232's ability to transmit data to the host computer is tested. Again using pin 7 of J9 as a ground reference, measure the voltage at pin 3 of J9. This is the MAX232's serial output. (...) (28 years ago, 3-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.058)
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| | Re: HELP! Handyboard ALMOST works.
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| In your message you said: (...) Sorry, testbrd.c and diag.c have nothing to do with the Handy Board. They are part of the older 6.270 board distribution. Get the hbtest.c program from the Handy Board software pages. -Fred (28 years ago, 31-Dec-96, to lugnet.robotics.handyboard)
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fred
(score: 0.058)
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| | Re: (IR sensors)
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| If you go to the following link: ftp://cher.media.mit.../cmcmanis/ You will find a file called ir.tar.Z which describes some software I wrote for a PIC chip that drove several LEDs and monitored three IR sensors (Sharp 1SU60s but could have as (...) (28 years ago, 17-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 0.058)
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| | Thanks, Fred
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| Fred, Thanks for giving us this great design. I appreciate it and I enjoyed building my Handy Board from a kit. I do have two corrections, though. No big deal, just typos. In the on-line assembly instructions, J15 is referred to as J14 at one point, (...) (28 years ago, 27-Dec-96, to lugnet.robotics.handyboard)
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fred
(score: 0.058)
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