 | | Re: more help, please!
|
|
It all depends on how much you want to spend and how you want to drive them. 1) The piggy back method works, but is difficult to manage mechanically and the chips weren't designed for it. (Generally it works ok however) 2) Using a separate H-bridge (...) (27 years ago, 24-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: DIP switches
|
|
you can use dip switches in the standard digital in ports if you either (a) solder them to male header first, or (b) insert them in a wire-wrap socket and then insert the wire-wrap socket pins into the HB sensor ports. both of these methods get (...) (27 years ago, 24-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: connecting (LEGO) motors
|
|
all 9v LEGO motors are fine with the Handy Board. -Fred In your message you said: (...) (27 years ago, 24-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Books on bots
|
|
A really good reference on the Motorola MC68HC11 family and microcontrollers in general is "Design with Microcontrollers" by John Peatman (ISBN 0-07-049238-7). It provides an excellent overview of the HC11 and covers the hardware and software (...) (27 years ago, 23-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | more help, please!
|
|
hello Ok, i have a question. First of all, thanks to all who helped me with my h-bridge problems. You know who you are:thanx! ok, here is my question: i have 2 motors that draw 2amps apiece. I also have a 6v 7amp lead battery. Which of these options (...) (27 years ago, 23-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | DIP switch in headers
|
|
(...) Actually, this sensor connector layout was my idea back for the Rev 2 6.270 board, and, yes, I did have both keying, and, secondarily, dip switches in mind when I designed it. However, plugging in dip switches turned out to be a bad idea, (...) (27 years ago, 23-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Handyboard Expansion Board
|
|
(...) Well if you are not using it, you could use the trim pot to drive a menu. cya! .---...---.. | Remi Desrosiers | "My Youth in Arcadia" | harlock@videotron.ca . . (27 years ago, 22-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Handyboard Expansion Board
|
|
Actually, unless Fred has changed the way the sensor connectors work he was quite clever in that the spacing of the I/O connectors is exactly dip switch width. Basically you can plug in a DIP switch into the I/O header and get as many switches as (...) (27 years ago, 22-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Handyboard Expansion Board
|
|
Hi folks, I know it's probably a bit too late, but couldn't you somehow add some DIP-switches to the expansion board, like the ones on the 6.270 ? This would be very nice for quickly changing the way a program works, without hanving to recompile it. (...) (27 years ago, 22-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | connecting (LEGO) motors
|
|
Hoi, I am still puzzled about connecting motors to the handyboard. I have seen plenty of motors wich draw less current then 600 mA. But still they have a couple of Amps stall current. Are the moter drivers chips protected for this ? Are all LEGO (...) (27 years ago, 22-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Books on bots
|
|
Go to amazon.com...they have all the good robot books. (27 years ago, 22-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Books on bots
|
|
(...) Some titles of interest would be the "Robot Builder's Bonanza"(99 Inexpensive Robotics Projects) and Mobile Robots- Inspiration to Implementation- I don't Know if they still cary it but I purchased "Sensors for Mobile Robtics" from them not (...) (27 years ago, 22-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Handyboard with EPROM
|
|
Yes, there is a pin compatible EPROMs and EEPROMs for the Handyboard's RAM chip. However, without the RAM chip the board is limited to the 256 bytes (or 512 bytes in some versions) of on-chip RAM which can be pretty limiting. Another option is to (...) (27 years ago, 21-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Books on bots
|
|
(...) Hello Justin, Check out the reference section of my web page at (URL) are lots of books, magazines, and other sources of information listed there along with ISBN, contact information, etc. John Whitten brat@naxs.com (27 years ago, 21-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | connecting (LEGO) motors
|
|
Hoi, I am still puzzled about connecting motors to the handyboard. I have seen plenty of motors wich draw less current then 600 mA. But still they have a couple of Amps stall current. Are the moter drivers chips protected for this ? Are all LEGO (...) (27 years ago, 21-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Books on bots
|
|
Could you post the names of any useful books you find? For that matter, can anyone else suggest some good (and affordable...) books? Particularly on elctronics in general, the 68hc11(a1), and infrared? thank you, -- Justin Kao <jkao@compuserve.com> (27 years ago, 21-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | external memory
|
|
Hi, has anyone been able to successfully added another 32k ram chip onto the handyboard? In MObile Robots, it mention that this was possible for the HC11-based boards. If so, how involve is it? (27 years ago, 21-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | compile ICB files under Windows
|
|
Hi all, it turns out that the answer for doing this has been available for two years (!) Kent Farnsworth put together a set of GNU compiler tools, Randy's modified AS11 assembler, and a DOS version of the "as11_ic" Unix shell script, all working for (...) (27 years ago, 21-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Books on bots
|
|
Hello All, Just doing some late night web searching and found some pretty good info. I clicked on the Barnes and Noble banner add and did a search for "robotics" and needless to say I'm still going though their list on this subject! I had no idea (...) (27 years ago, 20-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: interfacing motors
|
|
You can "piggyback" two 1 Amp chips. ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of Mechanical Engineering The Cooper Union for the Advancement of Science and Art ---...--- (...) (27 years ago, 20-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Handyboard with EPROM
|
|
Can I put a Rom memory in the handy board? I don't need a battery , so i think to remove that and the battery. If is not posible...can add a ROM in a expansion board and download the code in the boot ? Thanks... German Pablo Gentile German Pablo (...) (27 years ago, 20-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | servos ?
|
|
Date sent: 19-AUG-1997 17:18:58 Hi, Could someone please give me a specific recommendation of a good servo to use for Lego robots with handyboards. I looked at TowerHobbies and robotShack and was overwhelmed by their lists. (I'm obviously just (...) (27 years ago, 19-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: interfacing motors
|
|
(...) One way to accomplish this is with an H-bridge motor drive other than the L293 on the HB itself. I one out of discrete components some time ago, using darlington TIP series transistors, and it works great. (Kudos to Chuck McManis.) It can (...) (27 years ago, 19-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | interfacing motors
|
|
hello, all you happy roboters! /I have a question about interfacing a larger motor to the HB. It runs on 6v & draws 1-2amps, depending on the load. I already have a 6v 7amp lead battery that I want to use to power the 2 motors. What would be the (...) (27 years ago, 19-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | IR Transmitter
|
|
Hi all, I was wondering if anyone could recommend an IR transmitter for use with the Handy Board's IR output (J7). If possible indicate manufacturer/part no. or supplier/catalog no. if possible. I was also wondering if anyone could tell me how (or (...) (27 years ago, 19-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Muscle Wire
|
|
Hi - Has anyone ever tried using "muscle wire" (nitinol) with the Handyboard? When you pass an electirc current through it, it heats up and rapidly contracts. The wire has a fairly low resistance - would it still be OK to drive it with the motor (...) (27 years ago, 18-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Lcd
|
|
(...) there are 3 kinds of backlighting * LED * electro-luminescent (EL) * cold cathode florescent tube LED and EL are thin panels behind the LCD glass (tho they do add thickness to the final unit). florescent is miniature lamps that go along one or (...) (27 years ago, 18-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Lcd
|
|
The backlit LCD uses lamp behind the display instead of the reflective light. U may check with the following LCD FAQs. All of these introduce you the technology used, pinouts, and programming of LCD. (URL) it helps. Patrick --00---...--- Low cost (...) (27 years ago, 18-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Lcd
|
|
Can anyone tell me the relevent information for choosing an LCD?I want to change mine for a backlit one and would like to make as few modifications as possible so I think I need to know pin outs(is that all?) and I may have to supply an extra +5v (...) (27 years ago, 18-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | H-bridge stuff on-line
|
|
I've created a MOSFET version of my H-bridge that is pretty general purpose and with the addition of a small mezzanine board becomes an electronic speed control. There is a web page that describes the PIC servo code at: : (URL) above paper describes (...) (27 years ago, 17-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | IR Transmitter
|
|
Hi all, I was wondering if anyone could recommend an IR transmitter for use with the Handy Board's IR output (J7). If possible indicate manufacturer/part no. or supplier/catalog no. if possible. I was also wondering if anyone could tell me how (or (...) (27 years ago, 17-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: positioning of robot
|
|
First, my appologies that this posting is off the mailing list's intended topic (the HandyBoard) but as it seems to be drawing a lot of interest I am hoping that continuing it is ok with everyone?) (...) Ok- first a disclaimer - I am not an (...) (27 years ago, 16-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: positioning of robot
|
|
I had some questions regarding John Whitten's recent posting about different drive types. (...) How is the math to figure out the narrowest space a vehicle can turn around in done? (What formula -- or formulas -- are used? Don't just give names, (...) (27 years ago, 16-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | thanks
|
|
As I just hooked up my Vector 2x compass to my handyboard and it worked the first time, just like my sonar did, I just want to say, thank you all very much for all of the help everyone gives. Thanks -Jim (URL) (27 years ago, 15-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: positioning of robot
|
|
I missed the first posting, I liked the summary posted by John Whitten. Youcan take his posting one layer "up" to get at the abstractions if you want. These are: 1. Points of contact with the surface - More increases stability. 2. Drive Train (...) (27 years ago, 15-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: positioning of robot
|
|
I think the Tyco ZIG ZAG makes a great platform. It is a treaded vehicle with a center motor/wheel set that moves it sideways. I haven't complete a robot with it yet but you may want to look into it. jm (...) (27 years ago, 15-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: positioning of robot
|
|
(...) Howdy- (...) No problem- as long as you get the relevant points across- that's what counts :) (...) Ok- that's a very good basic question. Here are the pluses and minuses for each type of drive system: 2 WHEELS: The two wheel drive system on (...) (27 years ago, 15-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | HB sampling rates
|
|
Hello all, Does anyone know the maximum sampling rate possible on the HB for an analog input being polled in Interactive C 3.1? Thanks, Colby (27 years ago, 14-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: More juice
|
|
This subject was discussed some time ago. The discussion yeilded the following: When you put two batteries in parrallel on paper, the voltage is exactly the same. In real life, the two bateries will have slightly different voltages and one will (...) (27 years ago, 14-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: type conversion
|
|
D> Hello, Does IC do type conversions like C? More specifically, if D> I have a persistent int that needs to become a global float to be D> used by a function, can this code do the conversion? D> persistent int ifactor; D> float factor; D> void (...) (27 years ago, 13-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | type conversion
|
|
Hello, Does IC do type conversions like C? More specifically, if I have a persistent int that needs to become a global float to be used by a function, can this code do the conversion? persistent int ifactor; float factor; void foo(void) { ifactor = (...) (27 years ago, 13-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Handyboard for sale...
|
|
Hi all, I'm offering to sell a Handyboard that I built a few months ago. When I was building my board I ordered double of all the components to get over some minimum orders. My plan was to sell the second board to offset some of the cost of the (...) (27 years ago, 13-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | HOW TO UNSUBSCRIBE
|
|
greetings all, this is the periodic reminder to please NOT send unsubscribe requests to the list en masse. to unsubscribe, write DIRECTLY to me, Fred Martin, fredm@media.mit.edu. regards, fred (27 years ago, 13-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | (no subject)
|
|
Unsubscribe . . . Thanks, Phil! (27 years ago, 12-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | READ THIS AND AVOID BLOWING YOUR CHARGER BOARD
|
|
(...) the list archives are linked from the Mailing List page, which is linked from the HB Home Page. (...) Yeah, that's wrong. phone handsets use a physically different plug, so they're not going to be a problem b/c they don't plug in right. The (...) (27 years ago, 12-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: your mail
|
|
(...) Yep. You used the wrong phone cord between the HB and the serial interface board. Fred recently answered that question on this group, I'd direct you to the archives of this list but I don't know where that is. The phone cord, I *think*, is (...) (27 years ago, 12-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | (no subject)
|
|
It looks like I used a network style RJ11 instead of a telephone style RJ11. Thanks for everyone's help. Colby Leider Dartmouth College (27 years ago, 12-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | (no subject)
|
|
did you perchance use a different telephone cable when plugging in your HB? if so, please see the FAQ for an answer. if not, there was some kind of short, either at the rj11 connectors or on the HB. -fred In your message you said: (...) (27 years ago, 12-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: charger board
|
|
It looks like your resistors are burned due to the short circuit between pin3 and pin4 of J10 on the charger board. I guess what you need is to replace those resistors (R11 and R12) and yellow LED, and the charger board will work again. Those (...) (27 years ago, 12-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | (no subject)
|
|
Hello all, I was charging my HB the other day, and suddenly, the two resistors right by the yellow "charge" LED on the serial interface ckt. went up in smoke. Has this happened to anyone else? Colby (27 years ago, 12-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Unsubscribe...
|
|
Unsubscribe...Thanks. Johnny. (27 years ago, 12-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Sorry for my questions... :)
|
|
Well, i'm sorry for the interference . You are building robots, and right now (only right now) i.m working with handys but in other way. I promise send you all the information about my project and really i expect be useful for all the mailing (...) (27 years ago, 12-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: positioning of robot
|
|
What is your application of the robot? My experience has shown that different wheel configurations lend themselves naturally to different applications: In general, think about how you want your robot to move and turn, and what sort of terrain it (...) (27 years ago, 11-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Thanks fro the reply...
|
|
At this point we're not quite into Handyboard questions, but since the answer might help others, here goes... (...) German, the world wide web is an amazing thing. The most amazing part isthe amount of information that is available on it. I took (...) (27 years ago, 11-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | HK HB
|
|
Gregg, I bought the assembled board. However, the supplier also sells unassembled kits. Check (URL) for the descriptions. Additionally, in further communications with the supplier, he mentioned that I could have avoided the wire fee by sending a (...) (27 years ago, 11-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Hall Effect Trans.
|
|
I have to measure the speed of a wheel similiar to a bicycle wheel. I figure the best way (or at least one way) to do it is to use a hall effect transistor switching into a counter. Does anyone have any suggestions for a part/manufacturer to use for (...) (27 years ago, 11-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Hall Effect Trans.
|
|
I'd like to hear what you come up with as well. Presently I just use the magnet/coil sensor pairs that you can buy in any bike store. You just hook the shield to ground, and the other wire to, say, an input-capture pin of a 68HC11, with a 3.3 K pull (...) (27 years ago, 11-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Hall Effect Trans.
|
|
I'd like to hear what you come up with as well. Presently I just use the magnet/coil sensor pairs that you can buy in any bike store. You just hook the shield to ground, and the other wire to, say, an input-capture pin of a 68HC11, with a 3.3 K pull (...) (27 years ago, 11-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Thanks fro the reply...
|
|
Well, so thanks fro your reply, you make feel live. You are rigth , Fred are right and so chuck are rigth.I'm very obsesive and may be not exist a answer short to my questions , sorry for my self. Your answer is very useful for my, but i don't know (...) (27 years ago, 11-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | More juice
|
|
Can you parallel a 9.6v eight pack NiCad cell to the HB Nicad pack? Has anyone done this with success? If so, does it charge properly? jm (...) (27 years ago, 11-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | re: magnetic card readers
|
|
dear german, i think what's going on is that you are asking very open-ended questions that require a lot of work to compose a helpful response. if i remember right, your earlier question was with regard to networking using the spi port of long (...) (27 years ago, 10-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | positioning of robot
|
|
Hello, First my apolgies for my bad english (my dutch is mutch better but afcouse thats becoust dutch is my first language). anyway. im working on a robot and use lego to test the best way for moving a robot. i see 3 options.. 2 weels, 4 weels (like (...) (27 years ago, 10-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Voltage
|
|
Yeah, the 12V goes into the motor power pin of the L293's. Thus you will get a higher than 9.6 motor voltage. ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of Mechanical (...) (27 years ago, 9-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: 3v motors
|
|
Yeah, you're right. I hadn't realize that constraint of the L293's. Sorry :b ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of Mechanical Engineering The Cooper Union for the (...) (27 years ago, 9-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Voltage
|
|
Hello all, Fred Martin may have said something to this list about 12v being ok as a battery voltage.If so does the motor drive voltage go up accordingly? Thank you for your help, Joe Martin Email:joema@mpx.com.au (27 years ago, 9-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | (no subject)
|
|
Hey Chuck, Being the lazy person that I am I modified another servo instead of figuring out the problem w/ the other one(I'll check it out later...) THE PROBLEM IS SOLVED!!!!!!! They both run much closer in speed. Now I'm off to get the rest of the (...) (27 years ago, 9-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Magnetic card readers
|
|
Thanks for don't replly to none of my e-mail!!! All it's cool , but i can accept nobody know wath i answer??? Well i really want somebody tell me: "well i don't want to reply you" . I can do work the reader with code in c , and i want to know how i (...) (27 years ago, 9-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Servo as drive motor
|
|
(...) Because the servos are closed systems they don't have a hard requirement that their motors run at the same speed, however it would affect the slew rate which is spec'd so they have to be reasonably close. If you zapped the capacitor and turned (...) (27 years ago, 8-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | stepper motors
|
|
Hi, Thanks for all the responses regarding CdS photo cells. Now I am considering using stepper motors in my project as well. I have seen some postings on this list before regarding these motors. Can anyone point me in the right direction for (...) (27 years ago, 8-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Servo as drive motor
|
|
(...) I'll try to replace the caps and see if there is an improvement. I was thinking that when I melted the new leads to the motor I may have left the iron on it for too long, thus burning up the caps. I'm going over to my dad's shop to work on (...) (27 years ago, 8-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: CdS cells
|
|
(...) It's certainly easiest to start out with a sensor that has a reasonable resistance range. However, if for whatever reason you have sensors that tend to be lower in resistance to the ideal, simply add your own resistor between the signal and (...) (27 years ago, 8-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Servo as drive motor
|
|
Hello, I have modified and connected 2 servo motors to the handy. The speed of one is much slower than the other. I swiched the motors around (first in Port (0),and (2) ) and then the reverse and the same motor is slower ... could I have fried the (...) (27 years ago, 8-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: CdS cells
|
|
David, I believe you will want to purchase ones that have a dark resistance more than say 20K. The sensor is part of a divider circuit that includes a 47K resistor. The sensed signal equals (sensor resistance)/(sensor +47K) multipled by 255. If your (...) (27 years ago, 8-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Obtaining a Handyboard in the UK
|
|
I just wanted to say that I ordered the HB from Hong Kong on Monday. I sended the money via my bank account and paid £12 for money delivered in 5 working days, or £17 for two. It containes: Kit A DB-9 or DB-25 (please select one of them, this (...) (27 years ago, 8-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: 3v motors
|
|
Yes Vs should stay at 5v, but if you read my original message the best thing is to use 9.6 volt motors!! Save yourself some trouble! jm (...) (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Hong Kong
|
|
Hi, As an additional note about buying the HB from Hong Kong, be on the lookout for wire fees or bank draft fees. I have just purchased an HB and the price is indeed good, but I also had to pay a $12-$20 fee for getting the funds to Hong Kong. The (...) (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: 3v motors
|
|
With the modification mentioned in the the FAQ, can you power 3V motor at 3V with external power? The FAQ mentions external 6-36V and L293D spec sheet says that the minimum Vs is Vss (which has a minimum 4.5V). The modification doesn't change Vss, (...) (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: Obtaining the Handyboard in the UK
|
|
(...) I too talked to Customs and they are typically confused and confusing about import tariffs and such. I was told that the limit was £19 for what that is worth. I would probably just order the damn thing and see what happens. Tax probably won't (...) (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: 3v motors
|
|
If you try to regualte the voltage to 3V You will still loose the extra power as in using a resistor. You lose it in the form of heat to be specific. Using a regulator will give you the 3V you need at continuous output. I'm not sure how voltage (...) (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | LCD
|
|
Does anyone know if the hb LCD is classed as reflective or transflective.If it is reflective is there a transflective counterpart(i.e. one that can be backlit)? Thank you, Joe Martin Email:joema@mpx.com.au (27 years ago, 7-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | RE: 3V motors
|
|
Yes, it is true that altering the duty cycle does not alter the voltage. What it does do it alter the amount of current to the motor. The problem with these motors is that they draw too much current, more than the HB can readily provide them. By (...) (27 years ago, 6-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: 3V motors
|
|
Also, something to keep in mind regarding the motor drivers is that "lowering the power" doesn't change the drive voltage. I assume (ok, here's a chink in the argument, if this is wrong, I hope Fred or someone will correct me) that the handyboard (...) (27 years ago, 6-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Interrupts in Interactive C
|
|
There a way from assign to a interrupt some function wrote in interactive C? How I can put the vector (for the SPI for example $FFD8) pointing to my source???? Thanks in advance. German Pablo Gentile Analista de Sistemas ggentile@cvtci.com.ar (27 years ago, 6-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: 3V motors
|
|
I too had a problem with 3 volt motors. The issue is the height of the PWM output. If you drive your motor function at 50%, then 50% of 9.6V is still much higher than the 3 VDC for full speed. One way to get some resolution is to modify the supply (...) (27 years ago, 6-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Motors
|
|
Hi. I am running two 3.3V motors with the handy board. Sometimes The motors would just stop running. The leds that indicates the motors are running are still lit. Also the two chips next the motor output gets very hot. The number on the chip is (...) (27 years ago, 6-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | MAgentic card readers again...
|
|
Anyone can help me about the way to connect a magnetc card reader to the handy? I use the idea from david negro , that use the SPI port, but i don't can make work the code... Can anyone tell me uf exists other source of that info ont the web?? (...) (27 years ago, 6-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: IR output on HB
|
|
No, don't use a transistor! The HB's IR out already has one. But the parallel-with-a-sepa...r-for-each method is correct. -Fred In your message you said: (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: IR output on HB
|
|
Run them in parallel, use a transistor. Like so: +5v | +---+---+---+---+---+ | | | | | | \ \ \ \ \ \ / R / R / R / R / R / R \ 1 \ 2 \ 3 \ 4 \ 5 \ 6 / / / / / / -- -- -- -- -- -- \/ \/ \/ \/ \/ \/ -- -- -- -- -- -- HB + | | | | | | \ | | | | | | / (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: CdS cells
|
|
[David.J.Dostal@lawrence.edu] spake unto the ether: (...) I just ordered some from Mouser, the smaller of the two physical sizes they have, 3K to 100K I believe are the light/dark resistances. These give analog(PORT) values of about 10 in ordinary (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | CdS cells
|
|
hi everyone, I am looking to purchase a batch of CdS photo cells but I think that I need more information before I order. The catalogs (Digi-Key, Mouser, etc.) list several different photocells (different resistances, power dissipation, etc.) and I (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | 3V motors
|
|
Mike, I had a similar problem and the solution is not to put a resistor in series with the motors. With the varying amount of current a motor draws, the voltage drop across the resistor will vary as well and the motors will not see a consistent 3V. (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | 3v motors
|
|
I have a cute little tracked robot base i want to run from a handyboard, but the problem is that it has 3V motors. The handyboard is set up to power 9v, right? The way i see it, i can either just put a resistor in series with the motor to drop the (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | IR output on HB
|
|
Hi, I'm trying to get the ir output on the handy board to power more than 4 LEDs (need to power 6), anything beyond that the ir signals become drastically weak. I have these LEDs wired serially. I'm not too familiar with electronics, so is it (...) (27 years ago, 5-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: ? mobile base for handyboard
|
|
Depends on what you want to accomplish. The LegoBug can use otpical sensors to follow a black tape and the smaller 'micro-motors' are better (less play) than the standard 9v motors. check out (URL) for instructions, ordering info and a price list. (...) (27 years ago, 4-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | ? mobile base for handyboard
|
|
Can anyone suggest mobile bases for the handyboard. I am looking for something which is reasonably priced and fairly easy to work with (for a "software" type!). Has anyone used the ARBE-ONE? LEGOBug? Thanks. David Naugler (27 years ago, 4-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | When Will It Be Available?
|
|
Hi! I got to do some test multi servo-motors. I found out the expansion board is not available yet. When will it be available from vendors? I can make a simple test by using #9 digi-input though. best Regards, Mark Kim (27 years ago, 4-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: RC bot base
|
|
Hi, A few students here at Penn State Abington successfully controlled the Zig-Zag using a 6270 board with both a 6volt and 9.6 volt supply using a .5 or 1 ohm series resistor. If I remember correctly the current is in the 2 amp range when loaded. (...) (27 years ago, 4-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: RC bot base
|
|
I have that car too but I haven't tied it to the handyboard yet because it gets stuck goin sideways! Does yours?? Have you tried the motor function or just the fd() function. The motor function should be able to slow down the motors. If not, the (...) (27 years ago, 4-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | serial data link
|
|
Hello All, I am trying to construct a device to replace the wires between the RS-232 converter and the Handy Board. Of the many questions involved in this sort of thing the first one I'm wondering if anybody has experience with is the matter of (...) (27 years ago, 4-Aug-97, to lugnet.robotics.handyboard)
|
| |
| | Re: IR Capture
|
|
(...) Try my IR routines available at (URL) should handle any # of data bits and any kinds of codes. e-mail me personally if you need more help. /Max (27 years ago, 3-Aug-97, to lugnet.robotics.handyboard)
|
