 | | Re: Electrolytic Capacitor Ratings [was Re: Choosing Parts?]
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Generally, cost, accuracy, size, and drift. Ceramic caps are expensive ($/pf) reasonably stable across temperature and acceptably accurate. Electrolytic capacitors are cheap ($/pf) only moderately stable across temperature changes, polarized, and (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | smooth PWM!!!...!!!
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hi everyone, i like to ask something on the PWM of the handboard. if i only do a command: motor(2,50); motor(3,50); i will get a smooth PWM of 500 Hz of waveform.( -_-_-_-_ something like this) but if i implement the above command into a program (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Electrolytic Capacitor Ratings [was Re: Choosing Parts?]
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As long as we are talking about caps, I cannot find the information about why one uses tanatlum caps vs ceramic caps vs electrolytic. What are the differences between the various types? Thanks, Gary Livick (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Re: I hope someone can help me...
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(...) If it is the note I posted, also get the followup. The initial post I think I made a couple errors, and then someone said their chips got hot :-o. Anyway a followup post corrected the information. (...) If you look at the pinouts for the 293 (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | RE: Electrolytic Capacitor Ratings [was Re: Choosing Parts?]
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Sorry to say, but the capacitance does change depending upon the applied voltage. As you increase the plate voltage a force is created pulling the plates together. This effectively INCREASES the capacitance. The good news is that this enhancement is (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | I hope someone can help me...
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I am planning on getting some LMD18200 motor driver chips from National Semiconductor and I found some info about which pins go to what by doing a search in the H-Board archive. Great resource by the way. It expalains how to take one of the standard (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Polaroid Sonars
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Hi everyone, It seems that the world's Polaroid Sonar reserve is almost depleted. Polaroid is currently in the manufacturing process to produce more. The company www.acroname.com still has them in stock if anyone is interested. ---...--- ericson mar (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Electrolytic Capacitor Ratings [was Re: Choosing Parts?]
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Capacitance is calculated using the area of the plates, the dielectric constant, and the distance between the plates. It does not have anything to do with the voltage. If a thicker dielectric is formed, it will reduce the capacitance. This is not (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | RE: new intranet ip
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(URL) now points to the new site also. Doug -----Original Message----- From: mark williamson [SMTP:markw@tabnet.com] Sent: Friday, March 19, 1999 2:42 PM To: Andy Stevens; Brad Davis; Brendan Benzing; Caitlin McGillicuddy; Carlie Ross; Chris (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Electrolytic Capacitor Ratings [was Re: Choosing Parts?]
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(...) listed (...) Your comments aren't taken as being harsh, but I'm still not sure I agree. Now I must say that my comments are based on something I heard in the rummer mill, but it still sounds plausible. What I heard goes like this. Electrolytic (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Polaroid Sonar
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Greetings, Acroname has them on their parts list, though I am not certain if they have them in stock (www.acroname.com). Marco A. A. de Oliveira assfalk@eece.unm.edu /---...---| /---...---/ CNPq Scholarship Awardee | | Research Asst. | | | ACE SMR (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | handyboard clock speed
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Ive checked the mailing list archives and i cant find a simple answer to the following question: Is it possible to run the HB at >2Mhz? That is, can I run a different version of the 6811 perhaps and get 8Mhz? What are the advantages/disadvantages? (...) (25 years ago, 22-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Mobile Robot Question
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(...) Can anyone answer all that? I think the answer is "it depends". Unfortunately it depends on so many variables that you'll just have to implement one system at a time, checking each thoroughly and modifying as you go. Make sure to go back and (...) (25 years ago, 21-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Polaroid Sonar
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(...) The Mondotronics Robot Store was selling them, but the price wasn't great. Instead of about $50 per transducer/board combo, they were selling pairs for $150 last time I checked. -- Will , , __@_/ \_@__ |/ | /__, o @_/ )\ ) ( \ (\/\\, ~~~...~~~ (...) (25 years ago, 21-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Choosing Parts?
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(...) I don't mean to be harsh, but this isn't exactly correct. The voltage is the highest the capicitor is rated for. if you have a 12V circuit it won't hurt to put in a 200V cap, but you'll need lots of room. Generally for safty, in high current (...) (25 years ago, 21-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Choosing Parts?
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In a message dated 4/21/99 1:08:33 AM Central Daylight Time, josr0633@cetus.zrz.TU-Berlin.DE writes: jos runarko: (...) For electrolytic capacitors, you want the printed voltage to be the closest voltage above the voltage you are operating at. The (...) (25 years ago, 21-Apr-99, to lugnet.robotics.handyboard)
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| | Choosing Parts?
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Hi, in Katalogs, there are many capacitors with the same capacity value but different voltage and tolerance. My question is, which voltage should I choose: above the operating voltage of 12 V? Second, the tolerance the lower the value it has a (...) (25 years ago, 21-Apr-99, to lugnet.robotics.handyboard)
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| | Re: help on replacement part
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yes. fred (...) (25 years ago, 20-Apr-99, to lugnet.robotics.handyboard)
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| | Mobile Robot Question
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Hi, I'm building a mobile robot using an R/C car with an Electronic Speed Controller (ESC) as the mobile platform, the Handyboard for sensorial data aquisition, and servo control; and a Linux "box" for GPS, videoconferencing, wireless (...) (25 years ago, 20-Apr-99, to lugnet.robotics.handyboard)
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| | help on replacement part
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Can anyone please tell me if a 50 v replacement for part C7 and C9 will be ok instead of the normal 63v one? -Jon Schuck (25 years ago, 20-Apr-99, to lugnet.robotics.handyboard)
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| | Polaroid Sonar
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Anyone know where to get a Polaroid Sonar besides Wirz elevtronics and Polaroid Corp? They are both out of the product. Thanks for any input. ---...--- ericson mar Robotics Consultant mar@cooper.edu (212)353-4356 Department of Mechanical Engineering (...) (25 years ago, 20-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Polaroid 6500
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Scott Sherman, My name is Fabian Lopez and I am to begin hooking up a polaroid sonar transducer to my handyboard.....any words of wisdom. Hola from New Mexico (...) (25 years ago, 20-Apr-99, to lugnet.robotics.handyboard)
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| | Spurious IR signal
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Dear IR users, I recently have begun experimenting with IR sensing for my HB by using an IR led and a 3 pin detector (Everlight IRM8100-3-M available from Radio Shack, cat no 276-137a). The LED is driven by a 38 KHz square wave (50/50 duty cycle). (...) (25 years ago, 20-Apr-99, to lugnet.robotics.handyboard)
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| | GP2D12
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Looking for this part. Does anyone know where to get it? ---...--- ericson mar Robotics Consultant mar@cooper.edu (212)353-4356 Department of Mechanical Engineering The Cooper Union for the Advancement of Science and Art ---...--- (25 years ago, 20-Apr-99, to lugnet.robotics.handyboard)
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| | Re: GCC/HC11 small patch
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Patch 1.2 to the GCC/HC11 compiler is now available on my FTP site: ftp.eskimo.com/u/a/a...est.tar.gz This new patch includes the patches by Otto Lind, Dr. Steven Barnicki, Keith Hearn, and myself. It is patch 1.2. Also, I put the latest snapshot of (...) (25 years ago, 20-Apr-99, to lugnet.robotics.handyboard)
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| | pcode_hb.asm
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Does anyone know where the latest pcode_hb.asm file can be found? Also, does one use as11 to assemble this thing, and are there include files that have to go with it, etc? I assume that dlm can be used to download the resulting .s19 file, am I wrong (...) (25 years ago, 19-Apr-99, to lugnet.robotics.handyboard)
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| | Help on selecting MOSFET
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Can someone give me the name of a P-channel depletion mode MOSFET that can handle like 6+ Amps. Thanks for any leads at all. :) ---...--- ericson mar Robotics Consultant mar@cooper.edu (212)353-4356 Department of Mechanical Engineering The Cooper (...) (25 years ago, 19-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Handyboard sudden turn off`
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Phillip, This happened to me once, and it was because I had an electrolytic capacitor installed backwards. You obviously have something drawing a lot of current, so if you check the caps and everything looks ok, it is somewhere else. Lacking any (...) (25 years ago, 19-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Vector Compass problem
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(...) I have seen that too. maybe have you main call comp_disable, do some stuff, and call comp_init. It may fix the problem. The compass should reset properly on it's own, but doesn't always. (...) Check you environment with a regular old compass, (...) (25 years ago, 19-Apr-99, to lugnet.robotics.handyboard)
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| | Vector Compass problem
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hi, i am currently trying to interface the vector 2x compass with the handyboard given the info and code provided on the handyboard web page. i am having 2 problems with it. 1) occasionally the compass doesn't produce a clock signal until i reset it (...) (25 years ago, 19-Apr-99, to lugnet.robotics.handyboard)
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| | SMT & PTH Assembly equipment - buy or sell
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Hello, If this message has inadvertently reached the wrong individual in your organization, please forward it to your manufacturing manager. My name is Lee Anderson and I represent Manufacturing Automation, Inc. We are a buyer and seller of new and (...) (25 years ago, 19-Apr-99, to lugnet.robotics.handyboard)
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| | Handyboard sudden turn off`
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Hi , I really need help. It's urgent!!! When I turn on the HD, the LCD did not appear anything Moreover, the program is not running running once I download and pressed start. The worst part is that the U13 LM7805 CTB is getting HOT that can burn my (...) (25 years ago, 19-Apr-99, to lugnet.robotics.handyboard)
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| | Re: Sonar and Compass
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Hi Tom, I would be instrested in using your code for using both sensors when completed. I used your eariler code for the v2x and it works great, Thanks for your contributions and dedication to help those less competent writing code. bye. ---...--- (...) (25 years ago, 19-Apr-99, to lugnet.robotics.handyboard)
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| | 12v SLA Battery
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Hi all, I'm currently putting together a handyboard system, and my question is, can I simply use a 12v sealed lead acid battery in place of the 9.6v rechargable pack? I know that the interface board won't be able to charge the SLA, but apart from (...) (25 years ago, 18-Apr-99, to lugnet.robotics.handyboard)
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| | Re: first step in assembly of the handy board...
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(...) If you are at section 4.1.2 of the assembly manual, follow the debugging routine outlined in 4.1.3 ie. check the DC adapter for polarity, check the LED for polarity, check the orientation of U13 and D3... Hope this helps, Duncan (25 years ago, 18-Apr-99, to lugnet.robotics.handyboard)
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| | first step in assembly of the handy board...
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I'm kinda new at this...Can anyone tell me what voltage I should be checking with my multimeter(1000 or 200 or 200M etc..)? I'm on the first testing stage of the main assembly of the handy board and I get no voltage and GND and +5v spot, also my led (...) (25 years ago, 18-Apr-99, to lugnet.robotics.handyboard)
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| | Connection Serial Board <-> Handy Board
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Dear Handy Board user, I have several question regarding the Handy Board, but first I want to ask you about the connection between the Serial and the CPU Board. 1. I saw in the part list the use of a RJ11 6/4 top entry at the CPU side and the use of (...) (25 years ago, 18-Apr-99, to lugnet.robotics.handyboard)
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| | GCC Handyboard Library
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For all of you (2?) who have been anxiously awaiting the Handyboard library for the GCC compiler: It ain't ready yet. :-( Keith Hearn and myself have been working hard at different pieces of it, and we're hoping to have a merged library sometime (...) (25 years ago, 16-Apr-99, to lugnet.robotics.handyboard)
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| | Please help
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Hello all, I want to power some twelve volt gearmotors (The kind currently available from Acroname) with the H board without extensively (or permanently) modifiying the H board. My plan is to use some MOSFETS that have a low voltage gate threshold (...) (25 years ago, 16-Apr-99, to lugnet.robotics.handyboard)
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| | Help on Microprocessor circuitry(4.1)
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I'm having a lot of trouble with the first assembly of the handy board(4.1)...I installed all the parts, but the led does not light and I get zero voltage at GND and +5v...What could cause zero voltage accross the board??? I already switched D3(like (...) (25 years ago, 16-Apr-99, to lugnet.robotics.handyboard)
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