 | | Re: DS1820 sensors?
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|
(...) ftp://ftp.cmf.nrl.na...lib.tar.gz Fairly-well commented source code is included (and sample C code that will do the nutty protocol to discover all 1-wire devices). It's for a different type of assembler, but you should be able to get the idea. (...) (27 years ago, 27-Apr-97, to lugnet.robotics.handyboard)
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| | DS1820 sensors?
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|
Has anyone been able to interface the DS1820 temp sensor (or any other 1-wire device) to the handyboard/miniboard/whatever? I'm working on a project where it'd be nice if I could figure out how to interface to these devices. (27 years ago, 27-Apr-97, to lugnet.robotics.handyboard)
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| | Sonar problems
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Maybe i'm beating this subject to death, but it's driving me crazy. I've read every post and readme file i can find and my sonar still does not work. 6500 hb pin 1 gnd pin 4 pin 9 motor driver socket ( ic removed) pin 7 analog port 0 (marked 7 on (...) (27 years ago, 27-Apr-97, to lugnet.robotics.handyboard)
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| | DC motor and Shaft encoder to recommend...
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Hi, Can anyone recommend any good DC motor and shaft encoder suitable for handyboard. Thanks... Johnny. (27 years ago, 27-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: HB connectors
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|
Yoni Garbourg wrote: Anyone knows a generic store name that sells those male headers that make connectioins for the HB. I need them right now, so DigiKey is not good enough. Radio Schack does not seem to have them. Sincerely, Yoni Garbourg << To (...) (27 years ago, 27-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Using analog ports as digital
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(...) The way it really works is that if the analog value is 255 then it returns 0 other wise it returns 1. So you can modify the lib_hb.c file and change the constant, or use the analog() call on the pin. --Chuck (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| | IC compatibility with PowerBook 520
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Fred, Your suggestion worked. Appletalk WAS on and inactivating it solved the problem. Thanks a lot. Sincerely, Yoni Garbourg << To succeed, Atificial Intelligence needs 1.7 Einsteins, two Maxwells, five Faradays, and .3 Manhattan Projects." >> (...) (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| | Using analog ports as digital
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The HB manual says that if you us the digital command on an analog port, the result is true if analog measurement is <127, and false for analog>127. I tried this and it does not seem to work that way. I get true for 0<analog<255, basically (...) (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Micromouse...
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Hi, Have anyone used the handyboard before to design a micromouse? If anyone have, please let me know....Thanks... Johnny. (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| |
| | (no subject)
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|
(...) This is normal, the transistors in the motor chips lose a couple of volts. (...) Probably you are driving too much current through the motor chips, they overheat, shut down, cool off, and recycle. Get a meter with a 2A scale and put it in (...) (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: error with freeware DL under Windows 95
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|
The recommended downloader when running Windows 95 is HBDL.EXE, *not* DL.EXE. HBDL is available from the HB Software Resources page. (This is pretty clearly stated in the HB Tech Ref... if you don't have a copy you should get it, from the HB Tech (...) (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: HB connectors
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|
Try calling You-Do-It Electronics in Needham MA. -Fred In your message you said: (...) (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: HB connectors
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|
(...) Digikey will ship FedEx the same day so in less time than it takes for this email to hit the list and be responded to you could be soldering your connectors. Of course you will have paid $15 for them so patience has some virtue :-). Any (...) (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| |
| | error with freeware DL under Windows 95
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|
(...) Be sure to run DL in full-screen mode. (One problem with the old, freeware IC and DL is that they will lose communication sporadically under Windows 95 unless you run them in full-screen mode.) -- Randy ---...--- Randy Sargent Newton Research (...) (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: HB connectors
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|
There are probably local electronics stores in your area that do have them. I know of several chains in the Iowa/Illinois region that do, including Warren Electronics in Davenport, which has almost anything you could wish for (well, it had (...) (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| | Communication problem
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|
I have just attempted to communicate to the handy board and am receiving the following error: Expected 56, received 141, after 64 chars received Perhaps the board was not connected properly or not in download mode. I built the board myself and (...) (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| | How much current for IR Transmitter can support ?
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|
Hi, Any one know how much the IR transmiter on HB can supports through the Q1 transister ? Thank you in advance, -Pandit (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| |
| | HB connectors
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|
Anyone knows a generic store name that sells those male headers that make connectioins for the HB. I need them right now, so DigiKey is not good enough. Radio Schack does not seem to have them. Sincerely, Yoni Garbourg << To succeed, Atificial (...) (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| |
| | DC Motor and Battery question
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|
I am working on a robot using 12V Barber Coleman geared motors. I have followed the instructions on connectingan external battery to the HB. I have about 15V worth of "C" Alkaline batteries connected in series and into the HB. The motors show they (...) (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Question on Kent Farnsworth's IR routine?
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|
On the Handyboard software archive, Kent has the following port definitions in the file HB2_EQ.ASM: * equates for Sharp IR sensors -- start at port 4 IR_MASK_ZERO EQU %00000100 IR_ADDR_ZERO EQU $1000 /* port A */ IR_MASK_ONE EQU %00100000 (...) (27 years ago, 26-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Interfacing microprocessors
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|
Hi all! I was reading the book mobile robots, by Jones & Flynn, and read about how a port can be used fo tellecommunications between 68hc11aifn's (and others, I assume, in the 68hc11 series). Has anyone tinkered around with this, either with the HB (...) (27 years ago, 25-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: hbsonar
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|
Check out the multiplexing circuit that I designed. It's on the HB webpage. Can't remember the URL, but you will find a link under my URL (see below) via Mouse 'Data'... I'll be happy to correspond with you on this after I've completed my finals (1 (...) (27 years ago, 25-Apr-97, to lugnet.robotics.handyboard)
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| |
| | mc34064 for ds1233-10?
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|
Is it allright if I replace the ds1233-10 with an mc34064? Thank you.. Ferry Toar toar00@rad.net.id (27 years ago, 25-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: IC for W95
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|
(...) the freeware version of IC runs fine under W95 as a DOS app. Get it from the Handy Board Software Resources page: (URL) (27 years ago, 25-Apr-97, to lugnet.robotics.handyboard)
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| | IC for W95
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|
I was wondering if there's a freeware version of IC for windows 95. If so, how can I get it? Also, do I need any registration number? Please respond asap. I'm anxious to program my HB. Thanks, (...) (27 years ago, 25-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: To HB or not to HB, that is the question.
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|
(...) I emailed the people at Imagecraft and asked them if ICC11 works with the handy board and they said they are working with Fred Martin on it. I noticed on thier home page that they claim to have LCD driver code in a library of version 4 ICC11. (...) (27 years ago, 24-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: LCD & serial connection
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|
It is possible you have a bum 6811. I have seen 6811's with bad output address lines. this causes mirroring in the RAM as what should be multiple locations get mapped to the same byte in memory. The downloader thinks things are working because each (...) (27 years ago, 24-Apr-97, to lugnet.robotics.handyboard)
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| | LCD & serial connection
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|
Thanks to those of you who sent your suggestions regarding the message below. I tried it all (replacing the LCD, checking each pin on both the RAM and the octal transparent latch 74HC373 for continuity, double checking the installed parts, I even (...) (27 years ago, 24-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: More Power
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|
Since we're on the topic, I would vote for the Hitachi SH series of 32-bit RISC microcontrollers. For $99, you can get an evaluation board with 64K of RAM (with sockets for up to 256K and other provision for further expansion), and the full GNU (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: motors
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|
Here's the motor I used so you all know not to buy it. Barber-Coleman FYQF 63310-9 12V DC If anyone has had any experience with this one or its siblings, please share your thoughts. I would be grateful for any further info. :) ---...--- ericson mar (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re:
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|
I too was there during the contest though I was not one of the participants. I would like to add that the fire-fighting contest was the very first robot event I have been to. Now I plan to go to some of the other ones this year. Now I know why quite (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| | Re: To HB or not to HB, that is the question.
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|
(...) There is a site that has an older version of ICC11 on it for free. I don't know the legalities involved with using that program. In any case, I found it using Yahoo while looking for some other robotics stuff. The site is (URL) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| | IC
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|
(...) We're working on a new set of drivers for motors that have twice the resolution. The main problem is that the IC drivers were designed for the 6.270 board, which uses a battery voltage of 6v. Folks want to use low-voltage motors with the 9.6v (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| |
| | ICC Multitasking...
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|
(...) Raj, Thanks for the reply. According to the ICC web page they have two multitasking options: ---...--- REXIS Subsumption Architecture Multitasking Executive REXIS (Real-time EXecutive for Intelligent Systems) is a multitasking executive with (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| | Re: To HB or not to HB, that is the question.
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|
(...) For a decent and inexpensive 68HC11 ansi-C compiler you should look into ICC11 from imagecraft. I think they have a dos version for around $50 and a windows version for around $100. I used it in a project with the motorola 68HC11 evb and I was (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| | Re: To HB or not to HB, that is the question.
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|
Another followup, there is no "right" answer either. There is no perfect processor, the reality is, no one has the best experience to build the perfect processor. Don't not build something because there isn't a right answer. Build something, add to (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| | Re: To HB or not to HB, that is the question.
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|
I say use both. The HB is great at sensing and driving, but for heavy-duty processing, use another processor. Don't limit yourself to 8051 derivatives either. (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| |
| | RE: More Power
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|
Randy said, (...) This is actually something we plan on doing the second go round. I've had lots of experience with imaging in software (motion capture, finding edges, filtering, etc., etc.), and my 'bud' (as Chuck refers to him) has plenty of CCD (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| | More Power
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|
(...) If you're looking to move up in speed and functionality, let me recommend a real 32-bit embedded processor, like the Motorola 68332. They're not expensive, and they have some quite amazing features. Most folks don't run into performance (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| | Re: To HB or not to HB, that is the question.
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|
(...) I believe the answer is 'yes'. Which may sound silly but may turn out to be the answer you settle on. Tom's comments about the power of 8 bit computers is spot on. They eventually lose their ability to 'keep up' as it were, however they are so (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: To HB or not to HB, that is the question.
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|
(...) F> I've been looking into the HandyBoard, and it looks great. I'm F> wondering if I could get some opinions here. A friend of mine and F> I are going to build a robot, and we are trying to decide if we F> should go with the HB, or make (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| | To HB or not to HB, that is the question.
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|
I've been looking into the HandyBoard, and it looks great. I'm wondering if I could get some opinions here. A friend of mine and I are going to build a robot, and we are trying to decide if we should go with the HB, or make something else. I know (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: serial connection
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|
Yep, My lab partner and I had an intermittent "fade to blank" problem that we solved by putting in a new LCD. jm (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: serial connection
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|
(...) and then Chuck McManis wrote: (...) Not necessarily. There could be a problem with the memory circuit that is preventing pcode_hb.s19 from loading properly. Tunde, use a multimeter to check all of the connections in the memory circuit (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| | IR In
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|
Are there any software to allow the handy board to receive input from 3 different IR receivers? I have check the HB web site but what is there only allow input from 2 IR receivers. I need to use the IR receiver to check for the presence of an IR (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: serial connection
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|
(...) Your LCD is bad. Either the logic to it is in error (check for an open on the E pin) or the LCD itself is non-functional. If IC cannot talk to the LCD it won't run. (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| |
| | (no subject)
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|
AN OPEN LETTER TO PROFESSORS JAKE MENDELSSOHN AND DAVID AHLGREN, ESTEEMED FOUNDERS OF THE TRINITY COLLEGE FIRE-FIGHTING ROBOT COMPETITION. Wed Apr 23 00:50:42 1997 Dear Jake and Dave, Thank you for organizing such a fantastic robotic event. It was (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| | Proximity sensor circuit on the web!
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|
I have posted the circuit to my web page about ten minutes ago. The address for the page is in the sig. file at the bottom. Follow the robot link near the top of the main page for the schematic. Tell me what you think. Keith Keith Soldavin (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: Handyboard to Vector 2X compass
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|
OK everyone. I put Tom's stuff online, see the HB HP (handy board home page :-). -Fred P.S. Tom, check your color table the next time you make a GIF. Somehow your black and white schematic GIF got saved with 256 colors (255 blacks and 1 white), (...) (27 years ago, 23-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: Handyboard to Vector 2X compass
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|
C> I'm planning to hook a Vector 2X digital compass to my HandBoard. C> I'm looking for any code for such and interface. It should be C> simple SPI stuff but I've never messed with the SPI before and C> would rather not re-invent the wheel. I've (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| | serial connection
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|
Hi, I am still trying to get the PC-Handyboard connection to work. I got as far as downloading the pcode_hb.s19 file successfully. After I turn the main board power off and back on (reset), I should get a message on the LCD screen ("Interactive-C v (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: I have a good schematic to post
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|
Hi Keith. Send it to me and I'll post it for all. Please send as a GIF not JPG as this is better for line art & text (i.e., a schematic). I can decipher just about any encoding format so use whatever's easiest for you. -Fred In your message you (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re[2]: Good books about electronics
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|
Speaking of good books: It seem the majority of books you can pick up is on "ideal" electronics. The "ideal" transistor, the "ideal" op-amp, the "ideal" circuit! What about a book that tells you when you should put a capacitor of XuF across Vcc and (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| |
| | I have a good schematic to post
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|
I have finally debugged my IR proximity sensor circuit and I want to post it to the group. My question is what is the best way to post it? I can put it into a JPG file but I don't want to just send it to the whole group at once. Fred, can this go on (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| |
| | hb serial connection
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|
Hi, I recently purchased a handy board kit, and while assembling it, ran into some "download" problems. After the memory chip and LCD were installed (Section 6.0.4 and 6.0.5 of the assembly guide) and I tried to download the IC file (dl (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: Polaroid Sonar
|
|
I was getting the exact same result when I ran motors with the HB while using my sonar. The problem was that there was alot of noise caused by my motors...apparently electrical and EMI. Do you have alot of components that may be causing some noise (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: Collision Advoidance Emitter Circuit
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|
Hi Gordon, When you mentioned about "doesn't have a ground in it", are you refering to the part the drives the LEDs, right ? If so, the explaination of the circuit is that when the output of the inverter that connected to a 100 ohm register goes low (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: Collision Advoidance Emitter Circuit
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|
(...) Yes, i have. (...) And: "Yep, it works" (little noisy though) Something particular you want to know? Hans (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| |
| | parts???
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|
I wonder where o where i can get the 32K ram chip and CPU for my handy board. I have e-mailed Gleason Research and Digital Micro Systems, and they do not respond to me! Anyone have any other ideas, i would appreciate them :-) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Polaroid Sonar
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|
Help! I've purchased the Polaroid Sonar OEM kit, plugged them in in accordance to Kent's instructions and using his software, but if I plug in BINH through a 360 Ohm resistor or with no resisitor, all I get is 1 - 2". If I unplug it, I get (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Collision Advoidance Emitter Circuit
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|
Hi All, Had anyone actually built the Infared LED emitter circuit that is on the Rug Warrior? (i.e. pg 108 of Chapter 5 of the book "Mobile Robots" by Jones and Flynn). I've looked at it and I can't for the life of me figure out how it works. Before (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: Good books about electronics
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|
(...) Mike, I would also recommend the book: "Electronics (A Self-teaching guide)" by Harry Kybett (1986 by John Willey & Sons) ISBN 0-471-00916-4. It is a very excellent beginning text. It teaches concepts and then you self test yourself every 2-3 (...) (27 years ago, 22-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: GPS
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|
(...) Yep. Me! There weren't any major headaches involved in doing it. Feel free to ask me questions. I may have to get my source from home in order to answer them though. Curt Mills, WE7U Senior Methods Engineer/System Administrator (...) (27 years ago, 21-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re[2]: motors
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|
Thanks. I tries that. I even tried to use four of them in parralel. OK, here's what I've discovered...just to let you all in on it and maybe it'll help someone in the future. I pulled the leads from the motor header and powered the motors directly (...) (27 years ago, 21-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Handyboard to Vector 2X compass
|
|
I'm planning to hook a Vector 2X digital compass to my HandBoard. I'm looking for any code for such and interface. It should be simple SPI stuff but I've never messed with the SPI before and would rather not re-invent the wheel. I've checked the web (...) (27 years ago, 21-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: motors
|
|
Mar, You might want to try attaching a small (0.1uF) capacitor to the motor leads as close as possible to the motor. Use a ceramic or monolithic ceramic capacitor. That might reduce the motor noise your sonar board sees. Also remember that even (...) (27 years ago, 21-Apr-97, to lugnet.robotics.handyboard)
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| |
| | GPS
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|
Hi, I want to connect a gps-receiver which provides NMEA-0183 data to the HB. Did anyone connect a gps to the HB before? Carsten (27 years ago, 21-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Using Step-Motors
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|
A couple people have expressed interest in how to use step-motors with their handyboards. I have used step-motors with my miniboard, and since both the handyboard and the miniboard use two L293D chips to run the motors, I am fairly confident that (...) (27 years ago, 20-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: motors
|
|
I haven't had the same poblems, but I have a theory as to your problem. There are two probabilities: 1) The motor is causing too much noise and is interfering with the sonar, or 2)The motor is giving off electrical noise (i.e. electromagnetic waves) (...) (27 years ago, 19-Apr-97, to lugnet.robotics.handyboard)
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| |
| | motors
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|
Hi, I have some motor trouble. I have two motors. I have a polaroid sonar. When I run one of the motors, the sonar works. When I run the other motor, the sonar's detected distance jumps arround randomly. The randomness seems to be more at higher (...) (27 years ago, 19-Apr-97, to lugnet.robotics.handyboard)
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| |
| | hbsonar
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|
I am trying to run 4 sonar sensors from the HB, and I'm not sure how to go about doing this. I have a copy of the code from the ftp://cherupakha.med...ntrib/kent directory, but I'm pretty bad with assemby language and I'm not sure what I would need (...) (27 years ago, 19-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Stepper motors driver circuit and .s19 compiler...
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|
Hi, I heard from fred that there is someone out there who had used stepper motors with the handyboard, I am doing something which need to use stepper motors. Therefore I need your help in this area, please email me how should I go about design the (...) (27 years ago, 19-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Stepper motors driver circuit and .s19 compiler...
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|
Hi, I heard from fred that there is someone out there who had used stepper motors with the handyboard, I am doing something which need to use stepper motors. Therefore I need your help in this area, please email me how should I go about design the (...) (27 years ago, 19-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: Stepper motors driver circuit and .s19 compiler...
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|
Good Day All, I also would like more info on this. If not too much trouble, could it be posted to the whole board as well? Take care... (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: Good books about electronics
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|
The ISBN is: 0-521-37095-7 I took the class at harvard that the book was written for. It was a good class. I learned a lot. I'm not so good with the analog stuff though... There is a student manual which is pretty helpful too. It's by Hayes and (...) (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: motor driver chip....
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|
SGS-Thomson makes the L293D and L293E: www.st.com/stonline/...s/1330.htm You can also build a custom H-bridge motor driver using the MAXIM 620&621 MOSFET drivers. Search for Maxim in a search engine. jm (...) (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: motor driver chip....
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|
(...) Depending on the manufacturer, you might be able to get the specs online, usually in the form of PDF files that are the datasheets for the chip. I know national semiconductor does this, and it's very fast and easy...otherwise, you have to try (...) (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| |
| | Re: Good books about electronics
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|
By far the best book for all kinds of electronics is "the art of electronics" by Horowitz and Hill. There is not a lot of "what is electricity" (try a good encyclopedia). This book begins with basic network theory and goes from there through just (...) (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | Re: motor driver chip....
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see the hb suppliers page for dealers who sell the l293d. (URL) your message you said: (...) n. (...) (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | Good books about electronics
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Hi! I'm very new in this business. So I thought where could I get a good tutorial book about electronic components and the way they work. And most important - what is electricity and how it works. Can anyone advise me? mike (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | motor driver chip....
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hola, I was planning on using the L293D motor chips in a project that I'm working on. I'm going to use polaroid motors to drive a vehicle. I was wondering: -Does anyone know how I could get specs for this chip? -Are there other motor chips that (...) (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | When will the expansion board come out?
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Hi, does anyone know when the expansion board will be available? Thanks, Duncan (27 years ago, 18-Apr-97, to lugnet.robotics.handyboard)
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| | battery life and charging
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Did someone already try to program the handy board the way to enable it testing the battery´s status and - if necessary - driving to a "docking station" and reloading the battery? (Self-feeding-automatism) Someone an idea how to solve this problem (...) (27 years ago, 17-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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Chuck, Chuck, Chuck...not EVERYONE in engineering and robotics is male. I, myself, am quite definitely *not*, nor ever will be, male. Engineering is a co-ed field, and women have made their mark upon it. While there are few of us compared to the (...) (27 years ago, 17-Apr-97, to lugnet.robotics.handyboard)
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| | line following
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I have had great success with black tape on many different light colored backgrounds but I wasn't using discrete components for the sensors and emitters. Instead, I used Omron EE-SY313 amplified infrared photosensors, and plugged them right into the (...) (27 years ago, 17-Apr-97, to lugnet.robotics.handyboard)
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| | battery life
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(1) the memory should last about a month if the board is turned off, as several have noted. (2) please be aware that the serial interface will *DRAIN POWER FROM THE HB* if the interface itself is not plugged into power. thus do not expect anywhere (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Small gear suppliers?
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Try. Stock Drive and Sterling. (516) 328-3300 ---...--- 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, 16-Apr-97, to lugnet.robotics.handyboard)
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| | gears
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Hello all, There is a company called Small Parts Inc. located in Miami Lakes, FL. They have been a good source for me in the past for all kinds of random stuff. I don't know if they have the specific parts you need, but they are a good shot, and at (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Small gear suppliers?
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We need some small gears for a gear train for a small DC motor. Does anyone know of likely vendors? I want decent quality gears, not plastic! Thanks. ***...*** * Greg Starr, Professor and Graduate Advisor * * Department of Mechanical Engineering ph (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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(...) The experience is good, I'm just not sure you took away the right lesson from it. :-) Everything Katt say's is true, when you are following lines detecting the line is sometimes not as straight forward as the description would have you (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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(...) As have I, so when I wanted to build a line-follower, I used a couple of IR detectors in concert with a pair of IR emitting diodes. They were arranged on the nose of the robot as follows: 1 2 3 4 \ | | / Where 1&4 are the IR emitters and 2&3 (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | variables
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Can you access variables declared in a binary progam from a different binay program? i.e. can "speeda" (pcode.asm) be accessed by xxxxxx.asm? Do you have to know the actual address where "speeda" is stored or can you just use "speeda" inside (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Battery life
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To avoid that battery problem, I have mine plugged in about 20 hrs/day and the other 4 hrs the serial interface is plugged in. I've had problems in the past where I've presented a robot that couldn't work because the batteries died & there were no (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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(...) <snip> (...) <snip> In my rather limited experience with reflective photosensors, I've found that black on white is not always the best of choices -- the white can come up as different numbers depending on how clean/dirty the floor is and the (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Battery life
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The best answer would be to take the mAH of the battery, say X=1500 mAH. Find out the current drawn by the RAM say I=5mA. Divide X by I and you get the number of hours of battery life. This is ofcourse assuming that you have a fully charged battery (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Battery life
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rabbit> 3600 since there are that many seconds in an hour. I myself rabbit> have left the handyboard off for periods of 4weeks or more rabbit> and still have had my memory. I just rattled the above off rabbit> the top of my head so, anyone, please (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Battery life
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Ive got a pretty crappy answer for you but its the best I can offer; check out how much current the RAM draws from a data sheet and calculate the power it uses (P = IV, where I=RAM current, and V=5v). Divide the mWHr your battery delivers by the (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: line following
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(...) I did something like this in an early computer engineering course. The requirements are exactly the same ie. follow a black line. What Chris said is a good start but you should also consider the case when the turn is too sharp; In this case (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Battery life
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Same question here. I left mine turned off for one night and the next day the battery had almost completely run down! jm (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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| | Battery life
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I think I already posted this question some time ago but never got an answer. Is it normal to have the HB run out of battery even when is not being used ?? I know the battery is always working to keep the RAM from erasing, but I'm wondering how long (...) (27 years ago, 16-Apr-97, to lugnet.robotics.handyboard)
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