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 | | Re: Sensor supply voltage & PC communication
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| hi. you can certainly tap the 9.6v batt output to power the sensor (use J13), but make *sure* that the sensor does not put out more than 5v, or you'll blow your analog inputs. if you're not sure, put a 1K resistor in series with the sensor's output (...) (24 years ago, 10-Sep-00, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: handy board troubles...
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| re: this problem with the memory contents not persisting, check the separate power supply to the RAM (U14). you might need to remove all socketed ICs from the board 'cause power can bleed to chips via input pins. also check that U12 the DS1233 is (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: HandyBoard Charging
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| no, to do the battery run-down test, you must not have it plugged in! otherwise you'd just be powering it from the adapter, and you'd never run out of juice. so, the steps are: 1. bootload your HB with pcode_hb.s19. you should see the Interactive C (...) (25 years ago, 16-Nov-99, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: downloading the pcode during assembly
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| The HB is supposed to be in special test mode, see (URL) . Re your downloading problems, first, see the debug info at (URL) the Windows serial debug test there, make sure that the serial signals are getting from the HB's RJ11 connector to the 68HC11 (...) (24 years ago, 12-Jan-01, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Up and running...
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| Ok, I have bought the domain name and setup the server. (URL) is now online. There are pics of creations my wife and son have made as well as my modifications of Technic sets I own. Soon to be more as soon as I get it all coded. Does anyone know PHP (...) (23 years ago, 31-Oct-01, to lugnet.publish.html)
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fred
(score: 1.044)
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| | Re: Battery Power and handyboard.
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| i'm not sure if wiring two nicad packs in parallel is a good idea. the packs would fight each other if either one's voltage varied even slightly from the other. i'd recommend either (1) John's initial suggestion of adding a separate pack solely for (...) (24 years ago, 19-Sep-00, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: Another assembly question
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| the fact that the two LEDs come on and then go off suggests that you *are* successfully putting the hc11 into download mode. it also happens that the hc11 TxD pin is in what's called "wired OR mode" during bootstrap. this means that it can only (...) (25 years ago, 14-Mar-00, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: LEGO Rotation Sensor
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| Rob, a few Q's: 1. Can you verify that +9v is being applied to the sensor by transistor Q2. Measure the voltage at the collector, you should see a pulsed waveform (rectangular wave) with +9v on's and 0v off's. (Refer to (URL) What is the (...) (24 years ago, 27-Feb-01, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: Over Charging
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| When the batteries are really run down, they can draw too much current through the on-board charging circuit. (I'm assuming you are plugging adapters directly to the HBs, rather than going through the serial interface/phone line charge ckt.) About 6 (...) (22 years ago, 3-Sep-02, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: Overcharged battery?
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| no i disagree with this answer. the HB is designed to be left on normal charge indefinitely. the batts can get a little warm. if they are hot then something is wrong, but a little warm is nothing to worry about. when fully charged and with no load (...) (25 years ago, 15-Mar-00, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: Reset & running Main ( )
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| John, a couple things. 1. when you quit and restart IC, it forgets what programs you may have loaded into the HB. so that explains your #4 case below. 2. IC has its own way of storing vectors for user code like your main() program, so you should not (...) (23 years ago, 30-Dec-01, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: IR port
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| see the v1.21 parts list in the hardware section, for the following info: re: R4's value. Depending on the variety of the manufacture of the HC132 chip, R4 should be either 3.83K (Digikey 3.83KXBK-ND) or 6.81K (Digikey 6.81KXBK-ND). To test this, (...) (23 years ago, 11-Nov-01, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: Robot Positioning using Beacons
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| The problem with IR is that it tends to get everywhere, reflecting off of surfaces etc, so it's hard to triangulate. May I suggest a related but different approach. Make your beacons out of hybrid IR/sonar transmitters. The beacons will periodically (...) (22 years ago, 1-May-02, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Handy Board list now a LUGNET newsgroup
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| Dear all, As announced, the Handy Board mailing list is now also a LUGNET (LEGO Users Group Network) newsgroup. What does this mean to you? It depends; if you are lazy, it can have no effect at all (maybe this is what you want :-). Or, if you are (...) (25 years ago, 15-Sep-99, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: IC problem
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| Hi. The default process is running of out stack. This is because you've written a program in which one function calls another, which calls another, which calls the first. Each time a function is called, an internal "call stack" must keep track of (...) (24 years ago, 4-Feb-01, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: Instructions for building own Handyboard
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| James, Gerber files can be found in the Hardware:PCB Layouts link. The HB is a fairly complex board -- are you sure you want to make it by hand? If you haven't gone from Gerber files to boards before, the HB probably isn't the best board to start (...) (23 years ago, 14-May-01, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: JRM code and Reset
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| OK, I looked at the source code to try to understand what could be the problem. If anyone wants to download the source themselves, go to (URL) and click on the link at the bottom of the page. The following is true of the open-source (free) version (...) (23 years ago, 2-Jan-02, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: Batteries again, sorry
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| you're almost right. if you plugged a nimh pack into the HB's charge jack, the external pack would charge the internal batteries. but it would not power the board significantly. this is because the HB's charge jack includes a current-limit resistor (...) (24 years ago, 22-Sep-00, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | come to the First Annual New England Botfest, Saturday, March 9th!
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| All, We're looking for people to bring robots, robotic gadgets, or any other sort of robotic invention/art/contra...n/whatever to our first annual New England Botfest. The BotFest is on Saturday March 9, 2002, at the UMass Lowell campus in Lowell, (...) (23 years ago, 25-Feb-02, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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| | Re: Just some questions...
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| (...) you are confusing mAh capacity (the amount of energy stored in the battery) with how fast the batt can deliver the power. the two are not the same. the fuse is in the design because nicad cells can deliver a *DANGEROUS* amount of power if (...) (25 years ago, 24-Feb-00, to lugnet.robotics.handyboard)
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fred
(score: 1.044)
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