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 | | First steps ok
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| Hi! I'm extremely happy today, that I could start mounting my Hand Board. The reset chips arrived and now the only thing that's missing is the lcd, but it should arrive by next Monday. I've mounted the serial comm board and it worked ok, and I've (...) (26 years ago, 1-Feb-99, to lugnet.robotics.handyboard)
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fred
(score: 1.000)
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| | Re: Moving Straight
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| Sean ... Probably the best way to maintain a constant heading is to use shaft encoders on both drive wheels ... monitor their rotation ... adjust one motor to give identical turn counts. The book "Mobile Robots: Inspiration to Implementation" by (...) (25 years ago, 28-Jun-99, to lugnet.robotics.handyboard)
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fred
(score: 1.000)
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| | minor update to new random.c
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| Field testing in a real class is the best way to get bugs out of code :-) My summer robotics class discovered a couple of "misfeatures" in my new random.c pseudo-random number generator library: (1) the rndrangei(), rndrangel(), and rnd() functions (...) (24 years ago, 28-Jun-00, to lugnet.robotics.handyboard)
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fred
(score: 1.000)
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| | Encoders, what are you using?
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| Hi, My homebrew quad hall effect encoder works, I'm learning from it. I get @ 1/4" resolution so there's plenty of slop. I can have the robot pace back and forth on a straight track for 6 passes or so then I start to veer off track. So I guess it's (...) (24 years ago, 10-Sep-00, to lugnet.robotics.handyboard)
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fred
(score: 1.000)
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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: 1.000)
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| | Polaroid 6500 Sonar Problem
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| I'm having difficulty getting my sonar rangefinder to work properly. I've got a fully operational Handy Board with a fully operational Expansion Board plugged into it (both purchased assembled from Gleason and used extensively already without (...) (26 years ago, 9-Mar-99, to lugnet.robotics.handyboard)
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fred
(score: 1.000)
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fred
(score: 1.000)
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| | Re: Yardsale FOTW
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| (...) Yeah, what I got this week wasn't exciting enough to merit its own post-- 8841 Desert Racer in box w/ instructions (missing a few pieces but the universal joint was there) for $1.00 and a misc. bucket of over 500 mostly small elts (with lots (...) (23 years ago, 21-May-01, to lugnet.market.shopping)
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fred
(score: 1.000)
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| | Set Inventories Index
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| I have created an index of all Lego inventories sources I could find, that is: - This newsgroup - The various "Set Inventories" area of Lugnet - Peeron - Enchanted Forest : (URL) can see the result (URL) The back-end is actually a database so many (...) (23 years ago, 17-Aug-01, to lugnet.db.inv)
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fred
(score: 1.000)
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| | Prisoner of Azkaban sets, (contains spoilers)
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| I was originally going to attach this to the last thread about book 5 “The order of the Phoenix” but it didn’t really apply so I started a new thread. Bruce does well to envision some potential sets for book 5, but at this rate that movie may not be (...) (21 years ago, 6-Jul-03, to lugnet.harrypotter)
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fred
(score: 1.000)
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| | Re: speed of the board
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| anton, You might want to think about getting rid of all those square roots. Take a look at what you are really trying to do and decide if you need the square root. For example, if you are just compairing two distances to see which is greater, you (...) (26 years ago, 4-Aug-98, to lugnet.robotics.handyboard)
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fred
(score: 1.000)
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| | The Spi port is fragile?
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| I have a ASAP proximity reader connected to the SPI port. I find some 68HC11 never detect signaling coming from Asap to the SPI port. Others work excelent. Except at 2 or 3 months begin working that fail definitively. I replace the 6811 but nothing (...) (26 years ago, 8-Nov-98, to lugnet.robotics.handyboard)
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fred
(score: 1.000)
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| | Re: brickwars transcript
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| (...) Polar Bear ! This was the surf-club labrador. (...) Some questioning of the Pope in the Popemobile indicated that the future king was expected at the beach house barbecue. Some Protestants marking 'their' territory on lamp posts were arrested (...) (24 years ago, 23-Oct-00, to lugnet.org.au, lugnet.loc.au, lugnet.gaming)
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fred
(score: 1.000)
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fred
(score: 1.000)
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| | Re: IC 4.01
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| Hi Scott, you may get interactive c from (URL) have versions for Windows, MacOS 9 and X, and Linux. Instructions have been documented in (URL) get more information about the programming robots with interactive c from Fred Martin and his Handyboard (...) (22 years ago, 26-Oct-02, to lugnet.robotics)
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fred
(score: 1.000)
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| | Anybody seen 6112 in stores yet?
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| Hi I'm looking for (URL) this set> (URL) It's also available (URL). I searched Froogle and everyplace that had it either didn't or wanted too much. I also checked the following brick-and-mortar stores: Toys "R" Us Fred Meyer Target Wal*Mart No dice. (...) (18 years ago, 15-Feb-07, to lugnet.market.buy-sell-trade, FTX)
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fred
(score: 1.000)
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| | Re: Stack Overflow
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| Hi everyone: Sorry for the reply latency, I was buried under an avalanche of work and assignments. Changing the format of the code (as detailed below) helped immensely. I re-wrote two of my drivers to use the increased size, and everything is (...) (26 years ago, 11-Feb-99, to lugnet.robotics.handyboard)
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fred
(score: 1.000)
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| | Re: Meijers in Grand Rapids
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| Thanks for that ref. notice how it claims the American Horse is a second cast. Incorrect. It is as if you took two sets and mingled the pieces, then reassembled them. Not possible to say which set was first and what set was second any longer. (each (...) (25 years ago, 16-Dec-99, to lugnet.off-topic.debate, lugnet.market.shopping)
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fred
(score: 1.000)
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fred
(score: 1.000)
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| | RE: Motor control
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| I would rather have use of the 0 to 8 range because many of the values in the 0 to 100 range simply fall into groups which give only 9 speeds. However, I do not support rewriting the IC code. Tom's suggestion, motor(1,value*14), is simple and meets (...) (29 years ago, 18-Mar-96, to lugnet.robotics.handyboard)
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fred
(score: 1.000)
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