 | | re: magnetic card readers
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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)
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| | positioning of robot
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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)
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| | Re: Voltage
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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)
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| | Re: 3v motors
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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)
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| | Voltage
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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)
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| | (no subject)
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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)
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| | Magnetic card readers
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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)
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| | Re: Servo as drive motor
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(...) 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)
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| | stepper motors
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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)
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| | Re: Servo as drive motor
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(...) 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)
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| | Re: CdS cells
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(...) 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)
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| | Servo as drive motor
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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)
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| | Re: CdS cells
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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)
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| | Obtaining a Handyboard in the UK
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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)
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| | Re: 3v motors
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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)
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| | Hong Kong
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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)
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| | Re: 3v motors
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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)
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| | Re: Obtaining the Handyboard in the UK
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(...) 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)
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| | Re: 3v motors
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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)
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| | LCD
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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)
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| | RE: 3V motors
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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)
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| | Re: 3V motors
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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)
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| | Interrupts in Interactive C
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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)
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| | Re: 3V motors
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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)
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| | Motors
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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)
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| | MAgentic card readers again...
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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)
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| | Re: IR output on HB
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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)
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| | Re: IR output on HB
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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)
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| | Re: CdS cells
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[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)
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| | CdS cells
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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)
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| | 3V motors
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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)
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| | 3v motors
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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)
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| | IR output on HB
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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)
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| | Re: ? mobile base for handyboard
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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)
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| | ? mobile base for handyboard
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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)
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| | When Will It Be Available?
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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)
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| | Re: RC bot base
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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)
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| | Re: RC bot base
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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)
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| | serial data link
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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)
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| | Re: IR Capture
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(...) 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)
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