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 | | Re: Readings
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| yes, memory wires should be oscillating, back and forth betw 0 and 5 volts. this is not floating; floating implies not connected. re: your other DL probs, usually, it is a bad connection on the PCB. try continuity checks on the memory subsystem. (...) (26 years ago, 17-Jan-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: L293 B/D/E
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| In your message you said: (...) no, you can't use the type B. See the HB FAQ for an explanation of this: (URL) am pretty sure the "E" is not compatible either -- it has 20 pins, right? sorry, but you need a D, or the TI replacement part indicated in (...) (29 years ago, 12-Mar-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | new version of 6811 Downloader for Mac
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| Hi all, The 6811 Downloader program was starting to be flaky under System 8, so I fixed an odd serial bug. More like a work-around, actually. Anyway, if you use this program, and it is starting to flake out on you, download the new version. It's at (...) (27 years ago, 6-Dec-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Connecting a second sonar module
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| (...) Sure, there's no reason you could set it up to use PD4, PD5, and TIC3 for a 2nd sonar. you might be able to get away with some signal multiplexing, assuming you're only firing one sonar at a time. i could see the BINH being no problem. For (...) (27 years ago, 5-Feb-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Print to IC's console window
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| (...) there is no builtin way of doing this. to get msgs back over the serial line, see the FAQ question at: (URL) Is it true that the handy board can only work when the LCD is plugged onto (...) you need a replacement pcode file to let the HB work (...) (26 years ago, 30-Nov-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Help with member profile / password
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| Hi, All- Is there a resource for help with editing my member profile and changing password? Specifically, my "home state" is wrong and I can't find an option to change it on the member profile page. Secondly, are there plans to change the password (...) (20 years ago, 10-Jun-04, to lugnet.admin.general)
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fred
(score: 1.028)
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| | Re: Update on the expansion board.
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| Hi. The beta testers are still discovering issues, so I'm not ready to release the design just yet. I'm particularly waiting for results of multi-servo testing. But, it appears that the basic design is sound, and only minor rework (if any) will be (...) (26 years ago, 31-Jul-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: (Handy-B) wrong connection...
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| (...) any normal cmos low power 28-pin (JEDEC standard) 32K RAM will work. You do not need a special battery backed variety. you also might have blown the 'hc373 chip, since that is part of the memory circuit. also check the 'hc132. hopefully the (...) (28 years ago, 6-Dec-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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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: 1.028)
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| | ICC Multitasking...
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| (...) Raj, Thanks for the reply. According to the ICC web page they have two multitasking options: ---...--- REXIS Subsumption Architecture Multitasking Executive REXIS (Real-time EXecutive for Intelligent Systems) is a multitasking executive with (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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fred
(score: 1.028)
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| | Re: Tone Functions
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| yep, 5 kHz is about the top end of the HB's 6811 capability. going higher would require dedicating the 'hc11 to generating the tone and doing nothing else. why? interrupt routine overhead. takes a bunch of cycles to handle an interrupt. the tone (...) (26 years ago, 15-Jun-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | (no subject)
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| (...) Yes, see the FAQ for a recently added section on the battery charging system. (...) Yes, this is a good idea if you are separately charging the HB's battery. As you correctly surmise, you don't want the two charging circuits contending with (...) (28 years ago, 1-Jun-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | cher is up again
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| but the incoming directory is disabled. i don't see any way around this problem; if there are incoming directories, it seems this gang of crackers will find them. i would still like to encourage people to contribute robotics related stuff, but it (...) (28 years ago, 1-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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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: 1.028)
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| | battery life
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| (1) the memory should last about a month if the board is turned off, as several have noted. (2) please be aware that the serial interface will *DRAIN POWER FROM THE HB* if the interface itself is not plugged into power. thus do not expect anywhere (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: INTERACTIVE C
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| not really. you can issue serial line characters to the desktop PC from the HB (see the FAQ), but IC cannot display them. so, for interactive development, it won't work. but if you can quit IC and run a terminal emulator program on your PC (e.g., (...) (26 years ago, 4-Jan-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Expansion board & V2X & sonar
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| re: exp bd SPI pins: * 2 of the pins are used by the sonar and aren't separately available. * the other 2 SPI pins are at PCB holes J20 and J21. see the schem for details: (URL) you need all 4 spi pins for something, leave out the j11 sonar (...) (26 years ago, 15-Feb-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Handyboard vs. Botboard 2
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| The botboard does not incorporate motor drivers; the Handy Board does. The handy board is smaller, and fits into a commercial plastic enclosure with the battery pack underneath. The botboard has prototype area; the handy board does not. The handy (...) (29 years ago, 29-Feb-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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fred
(score: 1.028)
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