 | | Wheel encoders
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(...) Yes, the pulley wheels near the drive wheels were drilled to accomodate 0.1" dia. disk magnets, available at the local hobby shop. The magnets activate the Hall effect magnetic sensors that are tucked away into the chassis (not easily seen in (...) (26 years ago, 1-Mar-99, to lugnet.robotics.handyboard)
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| | Polaroid sonar problems
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hi! Our group is still struggling with the polaroid sonar. We can't get any coherent reading, only readings that are in the range 470-515, which aren't effected by the measured distance. We have the capacitor and resistor installed as required. We (...) (26 years ago, 1-Mar-99, to lugnet.robotics.handyboard)
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| | (no subject)
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(...) Some time ago I did come across a site that talked about hacking a sonar tape measure. I can't remember where I saw it but I am confident that I had encountered it by searching "sonar" on one of the major search engines. You could be more (...) (26 years ago, 1-Mar-99, to lugnet.robotics.handyboard)
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| | Re: Mindstorm hacking program
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(...) You may want to start off by checking out: (URL) (26 years ago, 1-Mar-99, to lugnet.robotics.handyboard)
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| | 9600 Baud Serial Input Drivers?
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Fred and Others, I got hold of your 9600 Baud Serial Output drivers - thank you very much. Is there anyone from this list who have done the same thing the taking in serial input data using the PORT A pins? And another questions, about serial (...) (26 years ago, 1-Mar-99, to lugnet.robotics.handyboard)
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| | Re: Working with Legos
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Thanks for posting the pics ... great casters! Are you using the pulleys with near the driven wheels to sense wheel rotation? - - - Nick - - - Will Bain wrote: <snip> (...) (26 years ago, 1-Mar-99, to lugnet.robotics.handyboard)
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| | Re: Working with Legos
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(...) No problem--here it is: (URL) pretty sketchy, but I hope it helps. -- Will , , __@_/ \_@__ |/ | /__, o @_/ )\ ) ( \ (\/\\, ~~~...~~~ ' ` ~~~...~~~ ` ~~~...~~~ Wendy Parson, If you steal from one author, it's plagiarism; Will Bain, if you steal (...) (26 years ago, 1-Mar-99, to lugnet.robotics.handyboard)
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| | Re: Working with Legos
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The LEGO purists may not approve of this, but it does work well and it makes it relatively easy to use non-LEGO components. You *do* need to be cautious about what type of glue you use. Many glues will not adhere to the LEGO plastic, others will (...) (26 years ago, 28-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Working with Legos
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I glued a couple of the thin Lego strips to the bottom of my HandyBoard to make it quick and easy to plop the board firmly onto a Lego base yet still have it easily removable. Doing this you must be certain to get the correct Lego spacing, so first (...) (26 years ago, 28-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Working with Legos
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Some of the sensors that I've used easily attach to the the plates & hlocks with holes using a set of tiny nut, bolts, and washer(s). No damage done to any of the components, and easy to change your mind about where you're going to put it. -kr (26 years ago, 28-Feb-99, to lugnet.robotics.handyboard)
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| | I have made a i2c routine for the handy board
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Hello, You want to use the i2c bus (by the SPI connector) with your handy baord ? I have made a routine to use i2c component (PCF 8574, 8591.......) with the handy board. Do you want it ? See you later. Dperonne@aol.com (26 years ago, 28-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Working with Legos
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My only tip is to stay away from cyanoacrylics. I used superglue to try to attach a motor to a brick, and it started eating away the brick. Stuck like a champ, but I had red "puss" all over the place. (...) (26 years ago, 28-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Working with Legos
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(...) That's an excellent suggestion. Thanks, Max. There are many other tips on Lego robot construction techniques in an article titled The Art of Lego Design by Fred Martin. It's available for download from the Handy Board web site: (URL) have been (...) (26 years ago, 28-Feb-99, to lugnet.robotics.handyboard)
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| | Working with Legos
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I have found a simple way to attach non-Lego motors to Lego components. I just use a band clamp as is used in plumbing to tighten the motor against two Lego axles. There is a picture and further details to show how this works at (URL) anyone else (...) (26 years ago, 28-Feb-99, to lugnet.robotics.handyboard)
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| | RE: Schematic, PCB freeware
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Thanks for the info guys, I found several good candidates among the suggestions. Clancy (...) (26 years ago, 27-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Schematic, PCB freeware
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Dear Clancy, Try looking at ftp://bode.ee.ualber.../softw/ibm Yours sincerely, Nitin (...) (26 years ago, 26-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Handyboard >32Kb RAM
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(...) Actually its 64K for the HC11 cause it has a 16 Bit address bus. 16^2 = 65536 = 64K But the upper address space is used by the I/O and expansionboards. There are some little empty spaces which could be used for additional RAM. There are (...) (26 years ago, 26-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Schematic, PCB freeware
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Depending on how many components you want to use, there is an evaluation version of EDWin around that works quite nicely. Very simple to do circuits and stuff like that, with a good library of bits. Yes even an autorouter. It can also do multi-layer (...) (26 years ago, 26-Feb-99, to lugnet.robotics.handyboard)
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| | Static sensitivity
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I am starting to install I.C.'s on my board and I was wondering are any of the chip's on the handy board static sensitive? which is to say if I touch it I will destroy it, without having somekind of static gaurd. ___...___ Steve Wall Sir Sandford (...) (26 years ago, 26-Feb-99, to lugnet.robotics.handyboard)
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| | Handyboard >32Kb RAM
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Hello again, Sorry I made a calculation error. If the processor is 8-bit then 32K is the maximum possible RAM. So I think no upgrade is possible. Hans Venema j.venema@wing.rug.nl (26 years ago, 26-Feb-99, to lugnet.robotics.handyboard)
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| | More than 32Kb RAM?
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Hello, Does anybody know if it is possible to build a handyboard with more than 32Kb RAM? I do not know the exact details of processor, but if it is a 8-bit processor it should be possible to build a handyboard with a maximum of 256Kb memory! And (...) (26 years ago, 26-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Schematic, PCB freeware
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(...) Try this software: www.expresspcb.com Though, it doesn't have an auto route function, but this is good for simple pcb design. joema (26 years ago, 26-Feb-99, to lugnet.robotics.handyboard)
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| | Schematic, PCB freeware
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Does anyone know of a good but simple to use schematic an PCB design freeware program out there on the net?, I have downloaded a few but they vary complex and hard to learn for the simple board I need to create. I like something with a good (...) (26 years ago, 26-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Static sensitivity
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(...) You should probably ALWAYS assume that any IC is ESD (electro-static discharge) sensitive and take all precautions. Mike (26 years ago, 26-Feb-99, to lugnet.robotics.handyboard)
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| | RE: IR outputB
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(...) Of course... have you ever listened to your radio in the house before? (...) (26 years ago, 25-Feb-99, to lugnet.robotics.handyboard)
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| | (no subject)
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Has anyone hacked the sonar out of a sonar tape measure? Radio Shack sells sonar tape measures for about $25.00, that's half the price of buying the transducer and sensor together. I mentioned in a previous posting that I am interested in running (...) (26 years ago, 25-Feb-99, to lugnet.robotics.handyboard)
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| | Re: IR outputB
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(...) i do not have the Mobile robots inspiration book, but i think if you want to use it in a good way you will have to flash the right led for a time, check for reflection, then switch it of and check if there is also reflection (then it was (...) (26 years ago, 25-Feb-99, to lugnet.robotics.handyboard)
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| | RE: IR outputB
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I am looking at the Schematic in the HB HP right now. It looks like the 1K resistor is connected to the visible LED. From the schematic, it looks like you can connect a resitor and IR LED in series to the "3-pin female header" to make your (...) (26 years ago, 25-Feb-99, to lugnet.robotics.handyboard)
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| | RE: IR outputB
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I had intended the two types of interfaces for different purposes, but, I assume RF does not need line of site work. R/C cars for example can be controlled from several rooms away in my house (worked with one on a telepresence implementation). I (...) (26 years ago, 25-Feb-99, to lugnet.robotics.handyboard)
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| | RE: IR outputB
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The software written by Max Davies should allow transmission as well as receiving. The information that I have doesn't include the hardware layout but as far as I understand the 1K resistor in the IR transmission circuit on the board should allow an (...) (26 years ago, 25-Feb-99, to lugnet.robotics.handyboard)
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| | RE: IR outputB
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I heard that radio waves do not need "line-of-sight" like IR does. Can someone with more exerience verify or dispute this? It makes sense since longer wavelengths of EMR can bounce off surfaces easier. So maybe your Lynx device is better. ---...--- (...) (26 years ago, 25-Feb-99, to lugnet.robotics.handyboard)
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| | RE: IR outputB
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So, it seems like the short answer to this question is no one knows what to attach to correctly and safely (to prevent HB damage) allow IR transmissions from the HB :) I understand the receiving capabilities, as they are documented and have routines (...) (26 years ago, 25-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Another IC error: "Out of memory"
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Hi everyone: I went back and rethought this: (...) I played around it it some more, removed the 'scamper' gait, and got the size of code IC loads down to 12500 bytes, and the error is gone. I'm not sure if this means I have some 3k of variables, or (...) (26 years ago, 25-Feb-99, to lugnet.robotics.handyboard)
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| | Another IC error: "Out of memory"
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Thanks again for all the help with the "yacc" error I experienced before. I'm having new code resourcing problems now: mainly a problem with my 1994 version 2.851 interactive c. It loads my libraries, and I'm getting an error: "Out of memory (tried (...) (26 years ago, 25-Feb-99, to lugnet.robotics.handyboard)
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| | RE: IR outputB
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(...) It is not the bouncing off of things but the passing through them that makes RF able to operate without line of sight. Line of sight gives greater distances, though, even with RF. The Lynx Tx/RX will definately have a greater range than the (...) (26 years ago, 25-Feb-99, to lugnet.robotics.handyboard)
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| | Re: How to measure the signal Voltage ?
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not knowing anything about the sensor, but guessing (hoping) that it behaves like an open collector gate, this is what i would do--fool with the sensor on the bench to determine how it works before i let it near the HB. 1. power up the sensor, (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Print to LCD
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I certainly do! Spent a lot of effort working developing a machine code interface for the Handyboard. One of the biggest hurdles was getting messages to the LCD display. If you look on the Handyboard home page, in the contributed section: (URL) will (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Parts availability
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(...) I was able to follow the parts list and get most of the things from the suggested supplier. (...) (eqivalent?) (...) I thought that I got the memory from Jameco, but I think BG-Micro sells it was well. I would also think they both might carry (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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| | Re: IR outputB
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Is the IR reciever on the HB the same thing as in the robot in MR:ITI book? I though it would be different. In any case, you can but...the reciever is more effective as a "wireless communication" device that can recieve various IR codes which you (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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| | Re: IR outputB
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(...) o Hi Did anyone receive an answer to this. I ant to connect a Radio Shack (276-143) IR LED to the IR output and am wondering what resistance to use. Also, I saw a design in Mobile Robots..Inspirition where they use two IR LED (one on each (...) (26 years ago, 24-Feb-99, to lugnet.robotics.handyboard)
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