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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: 0.970)
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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: 0.970)
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| | Re: High current motors
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| I think the question on how to run higher current motors has got to be the most asked question here. Maybe we should add more info to the FAQ or something. Anyway, here is Chuck McManis' solution from a while back. I hate to send out something that (...) (28 years ago, 5-Apr-96, to lugnet.robotics.handyboard)
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fred
(score: 0.970)
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| | Re: Battery level monitoring?
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| (...) For anyone else interested, I came across a description by Fred of a modification to the Miniboard that describes how to cut a track on the board to allow analog battery level monitoring. Unfortunately, the picture is missing from the page: (...) (28 years ago, 16-Apr-96, to lugnet.robotics.handyboard)
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fred
(score: 0.970)
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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: 0.969)
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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: 0.969)
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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: 0.969)
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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: 0.969)
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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: 0.969)
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| | RE: Sonar
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| The Robotics Practitioner is a magazine about robotics targeted more for students and hobbyists than many of the professional Journals. Their email address is: trp@footfalls.com. Other two email addresses in the previous messge are the articlel's (...) (28 years ago, 9-Apr-96, to lugnet.robotics.handyboard)
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fred
(score: 0.969)
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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: 0.969)
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| | (no subject)
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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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fred
(score: 0.969)
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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: 0.969)
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| | Re: Expansion interface status
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| (...) To Fred and others, I've been thinking about this off and on for over a year now, and since I now have parts I'll finally get my HBs into something more than just board status. Robots eat I/O pins for lunch. Sensors eat input pins and (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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fred
(score: 0.969)
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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: 0.968)
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| | RE: High current motors
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| Jeff is correct, after looking at the schematics for the motor driver my circuit won't work. You will have to wire two sides of the motor driver output to the 2907's with back to back diodes. I'll draw up a schematic and post it. (In my original (...) (28 years ago, 15-Apr-96, to lugnet.robotics.handyboard)
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fred
(score: 0.968)
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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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fred
(score: 0.968)
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| | (no subject)
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| Fred, I have FTP'ed pcode-2.81.dist.tar.Z from cher (thanks for getting it back!) within it were the files foo.s19, pcode_rw.s19, lobo.asm, pcode.asm, and some makefiles.. Cool, but the files required for compiling IC 2.81 that I can't find are (...) (28 years ago, 1-Jun-96, to lugnet.robotics.handyboard)
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fred
(score: 0.968)
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| | Re: L293D Piggybacking
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| Yes, most people have found that this works. -Fred -- This message was composed using Articulate Systems' PowerSecretary, a Macintosh-based speech-to-text dictation system. Please forgive any sloppiness in the formatting. Thanks. -Fred In your (...) (28 years ago, 10-Feb-97, to lugnet.robotics.handyboard)
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fred
(score: 0.968)
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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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fred
(score: 0.968)
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