 | | Re: Burning hot motor driver chips.
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Anthony, As you've no doubt heard, RC motors take much more current than the Handyboard can supply. To control RC motors your only choice is to create a separate H-bridge to drive the motors. You can do this fairly inexpensively with power (...) (27 years ago, 10-Nov-97, to lugnet.robotics.handyboard)
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| | Re: IR devices
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Hi Jeremy! I used the shaft encoder out of a track ball for my robotic project(same thing but a bit bigger). You do not need the IC out of the mouse just take the shaft encoder and use it with a IR led and detector pair. If you are going to use the (...) (27 years ago, 10-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Burning hot motor driver chips.
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Hello, RC car motors pull a lot of current, from 2A to 8A. The L293D chip goes up to 1A peak (for some miliseconds) before it shuts down. I suggest bypassing the L293D chips and using something like the LMD18200. (URL) Good luck, Marco A.A. de (...) (27 years ago, 10-Nov-97, to lugnet.robotics.handyboard)
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| | Project Questions
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Three of us are undertaking a project using the Handyboard as the control system for a class at MIT. Our project, an autonomous blimp, has an unusual set of constraints, but we're hoping that your collective experience might be able to help us (...) (27 years ago, 9-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Burning hot motor driver chips.
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(...) sounds reasonable.. which "car" BTW? Some may be using that very same platform and may have some timely advice for you. (...) sounds like overload/overheating cutoff to me. (...) This is from the Handy Board FAQ : <---snip---> It is possible (...) (27 years ago, 9-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Burning hot motor driver chips.
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Anthony, (...) Yes it sounds like it. (...) It does. The L293D still works after it cools off, doesn't it? (...) I suspect you are going to need more than just two piggy backed L293D. (...) You might have a look at Ben Wirz website, he sells various (...) (27 years ago, 9-Nov-97, to lugnet.robotics.handyboard)
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| | Burning hot motor driver chips.
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After not doing anything with my HB for a few months, I decided to buy a cheap RC car and use it as a platform. Anyway, I get a car that takes 6 AA batteries because I figure that the main motor is probably 9v (maybe that was a faulty assumption). (...) (27 years ago, 9-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Shaft Encoders
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(...) We used the line of "S1" optical encoders from US Digital Corp. ((URL) and found them to work superbly. The encoders are light (~.07 lb) and small (~1.7" x 1.3"). The company is a "Value Added Retailer" and adds housings/bearings/whathaveyou (...) (27 years ago, 8-Nov-97, to lugnet.robotics.handyboard)
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| | IR devices
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I recently opened up a mouse (the computer kind, not the live kind) and found what I assume to be 2 IR shaft encoders which it uses to translate the direction you are moving the mouse. Is there a way that I could remove them and turn them into shaft (...) (27 years ago, 7-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Help in Assembler
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What is "ORG"? Does it matter what number you use? Is the number a memory location? Thanks for any help! :) ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of Mechanical (...) (27 years ago, 7-Nov-97, to lugnet.robotics.handyboard)
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| | Procedure to get off mailing list?
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Hi all, I was wondering how do I get off this mailing list? Thanks..... ===...=== Dale Bergman P.Eng Systems Engineer T Telehealth Solutions Computing Devices Canada. 1020 68th Ave N.E. Calgary, Alberta, Canada. T2E 8P2 Voice: (403)295-6778 Fax: (...) (27 years ago, 7-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Shaft Encoders
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Has anyone used an comercial optical encoder to monitor wheel velocity on their robot? Most of the ones i have seen use between 100 and 500 pulses/rev. This is a lot for the little software driven encoder routines to keep up with. I was just (...) (27 years ago, 6-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Shaft Encoders
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On Wed, 5 Nov 1997, David W. Kammer wrote: We are interested in connecting two shaft encoders to the wheels of our (...) You did not give specifications! Degrees/pulse (optical) or degrees/volt (resistor or LVDT), Speed maximum, Shaft size, and etc. (...) (27 years ago, 6-Nov-97, to lugnet.robotics.handyboard)
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| | UK SUPPLIERS OF PCBS
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Bill, BB> Does anyone know of UK suppliers for Handy Board PCBs and/or BB> component kits. I looked around a bit for a UK supplier too and found.. well, zip, nothing. So eventually I ordered a Handyboard PCB from Douglas Electronics in California. (...) (27 years ago, 6-Nov-97, to lugnet.robotics.handyboard)
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| | setting config reg with Win95
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We are currently building a dozen Handy Boards here at the Missouri Area Robotics Society (MARS). Everything is going very well for us, except for the members who are using Win95. The problem has been getting the config register set to 0xC0 with (...) (27 years ago, 6-Nov-97, to lugnet.robotics.handyboard)
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| | Australian Suppliers
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Does anyone know if there is anywhere in Australia that sells Handyboards in either kit form or the PCBs? ___...___ David Perrett Product Development Engineer VIAscan Quality Assessment E-mail: dperrett@vqa.gov.au Phone: 3807 8622 Fax: 3807 8633 (...) (27 years ago, 6-Nov-97, to lugnet.robotics.handyboard)
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| | Re: Help in Assembler
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(...) I think this might be what you want to do: varind FCB $00 * 0 <= varind <= FF ORG $c100 * some location of table var1 FCB 1 var2 FCB 7 var3 FCB 4 . . . varN FCB ? . . tabadr FDB #$c100 * address where table is stored start ORG $c000 LDX tabadr (...) (27 years ago, 6-Nov-97, to lugnet.robotics.handyboard)
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| | Help in Assembler
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Hi, Consider a part of a program: var1 FCB 1 var2 FCB 7 var3 FCB 4 . . . varN FCB ? If I want to use a variable (say X) to determine when to use "var1" to "varN", how can I do this (other than a whole bunch of CMP's). (i.e. when X = 3, I want to (...) (27 years ago, 6-Nov-97, to lugnet.robotics.handyboard)
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| | Shaft Encoders
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We are interested in connecting two shaft encoders to the wheels of our Handy Board - controlled mobile robot and use the ICW encoder instructions. Does anyone know of a good source of encoders? Is there anyone willing to share your experience with (...) (27 years ago, 5-Nov-97, to lugnet.robotics.handyboard)
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| | Expansion (infinity and beyond !!!)
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Dear All, OK people, Challenge time while Freds away !! I am trying to work out some code (without the aid of a HandyBoard !) My C is a bit limited, so any help would be gratefully received. I would like to add another 74HC374 to the board, with its (...) (27 years ago, 5-Nov-97, to lugnet.robotics.handyboard)
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