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(...) Yes, Edward R. Hamilton Booksellers has been sending me thier list periodically now and I never saw the Mobile Robots Book in it. I guess it's a good chance that they probably will not restock it. (...) (28 years ago, 25-Jan-97, to lugnet.robotics.handyboard)
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| | 8MHz crystal
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The 8MHz crystal is no longer listed in the Mouser Catalog (part #332-5080). When I look in the DigiKey catalog, it lists several 8 Mhz crystals with different load capacitances (18pF, 20pF, 32pF, and Series). Does it matter which I get? If so, (...) (28 years ago, 25-Jan-97, to lugnet.robotics.handyboard)
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| | Mobile Robots book
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Hello: Sometimes back there were posts here that the Mobile Robots book could be obtained from a bookseller in CT for $5! However, later appends said that this booksellers stock was exhausted. Are there any other discount book sellers around? (...) (28 years ago, 25-Jan-97, to lugnet.robotics.handyboard)
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| | thanks
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This is just a quick thank you to all those who replied to my plea for book information. I'm on the right track now. Gracias! Dave (28 years ago, 25-Jan-97, to lugnet.robotics.handyboard)
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| | books
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Hi all, What is the best way to get my hands on a copy of Mobile Robots: Inspiration to Implementation? My local book vendor wants me to wait two months for it. I'm hoping to find a faster solution. Thanks, Dave (28 years ago, 24-Jan-97, to lugnet.robotics.handyboard)
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Please subscribe me to the handy board mailing list. Thank you very much. Michelle Conway ***...*** * Michelle Conway * wake up late and honey put on your * * Doyle 213 * clothes and take your credit card * * x3343 * to the licquor store, well (...) (28 years ago, 24-Jan-97, to lugnet.robotics.handyboard)
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You are unsubscribed. For future reference, the way to unsubscribe is to write to me. fredm@media.mit.edu. -Fred In your message you said: (...) (28 years ago, 24-Jan-97, to lugnet.robotics.handyboard)
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| | LM052L LCD Display
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I have just had no success at all finding this part in the UK. I even talke to Hitachi UK and was told that if I wanted any it would have to be 100+ with a 20 week lead time! Now, I have an alternative fitted and working so there is no desperate (...) (28 years ago, 24-Jan-97, to lugnet.robotics.handyboard)
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| | bipolar steppers
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Suggestions Anyone???... Was wondering if anyone has an alternate solution to stepping a bipolar stepper? Currently.... I'm using an H-Bridge (driver if you will) SAA1042 (by Motorla) which is then getting its pulses from 1 of the motor outs on the (...) (28 years ago, 24-Jan-97, to lugnet.robotics.handyboard)
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Can anyone tell me how to unsubscribe from the handyboard mailing list? thank you in advance, Zlatko Horvat (28 years ago, 24-Jan-97, to lugnet.robotics.handyboard)
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| | Re: Problems with downloading
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Tom: Your tests, specifically the fact that the HB's PWR LED comes on after download fails, demonstrate conclusively that the HB can *receive* data from your PC. This proves that the downloading software is able to open the serial port properly, and (...) (28 years ago, 23-Jan-97, to lugnet.robotics.handyboard)
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| | Problems with downloading
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I'm trying to download the pcode_hb.s19 file to the handy board and I'm having a very hard time. I using win95 on a P5 and 200mhz. I setup the com port settings at 110 and no data flow. When I run the hbdl program and try to download the file I get (...) (28 years ago, 23-Jan-97, to lugnet.robotics.handyboard)
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| | RE: dual servo update
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(...) I use Futabas. The 32.768 mS interval is convenient because the 68HC11's 16-bit timer on a 2 MHz clock overflows at that time, allowing easier programming of the TOC functions. Has anyone found the upper limit on the time interval for Futaba (...) (28 years ago, 23-Jan-97, to lugnet.robotics.handyboard)
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| | Re: IC loop
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Hi Wade, You can use the "seconds()" function which reports elapsed time, plus a variable to keep track of when the loop should end: void main() { float end_time; end_time= seconds() + 20.; /* go for 20 seconds */ while (seconds() < end_time) { /* (...) (28 years ago, 23-Jan-97, to lugnet.robotics.handyboard)
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| | IC loop
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Hope someone can help, I have just written my first code for my bot. All I have done so far is make my bot go forward in about a 4 foot square area. I am now wanting to put a loop in the code so that it will continue for a certain length of time or (...) (28 years ago, 23-Jan-97, to lugnet.robotics.handyboard)
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| | bipolar steppers
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Was wondering if anyone has an alternate solution to stepping a bipolar stepper? Currently.... I'm using an H-Bridge (driver if you will) SAA1042 (by Motorla) which is then getting its pulses from 1 of the motor outs on the Handy Board. The (...) (28 years ago, 23-Jan-97, to lugnet.robotics.handyboard)
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| | RE: dual servo update
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Mike writes : (...) The limit is specified by the product manufacturer. Futaba servos don't guarantee they will hold unless they see a pulse every 20mS. The Tower Hobbies servos are a bit more lenient. If you have the servo manufacturers data sheet, (...) (28 years ago, 22-Jan-97, to lugnet.robotics.handyboard)
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| | Re: LCD screen
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(...) I ended up with a display that did this very thing (A Rolm display I think), and what I did was to cut the contrast lead coming out of the LED connector, and then solder a 20k pot to the GND, +5V, and Contrast leads so that I could vary the (...) (28 years ago, 22-Jan-97, to lugnet.robotics.handyboard)
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| | Re: LCD screen
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Garth The contrast of the LCD can be adjusted. The third pin from the left side of the LCD, labeled VR on the HB is the contrast adjustment. You can cut this pin from the male header than connects to the HB. Solder a small trimmer pot with the wiper (...) (28 years ago, 22-Jan-97, to lugnet.robotics.handyboard)
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| | Re: LCD screen
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I have seen cases where an LCD display was destroyed by excessive heat. I used to be in a car rallye club, and we had several timers destroyed by being left in a hot car. Could your board have been exposed to high temperatures during your travels? (...) (28 years ago, 22-Jan-97, to lugnet.robotics.handyboard)
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