 | | Re: electronics question please help
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Eric - - You might try shielding the IR sensor ... add successive layers of "Scotch" tape until you get the desired sensitivity. I'm using layers of black plastic trash bags ... it blocks a lot of visible light, but very little IR. - - - Nick - - - (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: L.E.D. question.
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Typical drop across an LED is about 1.45v. A unit rated at 5v likely has a build in voltage drop/current limiter (read resistor). I would suggest reading the info sheet for absolute ratings. In general, 'any' generic LED will work. Buy the cheapest (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: HB to create video displays?
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At 03:25 PM 2/22/99 -0500, Steve Wall wrote: [snip] In short I want to be able to watch the monitor and have (...) Checkout Decade Engineering's Bob II board at: (URL) I don't think it can do graphics, but it accepts serial input at 9600 baud and (...) (26 years ago, 23-Feb-99, to lugnet.robotics.handyboard)
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| | Re: electronics question please help
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(...) Been there, done that! Funny. I bought almost all the same stuff from my local shack. Writting the software was the easy part ;^). (...) I've supplied some power to the inverter, yes. I'm assuming it's mandatory to have the inverter actually (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: lib_r2.lis ?
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Dear Mr Pennington, Have you configured IC using ic -config command ? This sets the library file and its directory. For handy board, the library file is lib_hb.lis.This is a list file which contains the words lib_hb.c and lib_hb.icb. The lib_r22.lis (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Visual Basic and parallel port
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i know that this doesn't really have anything to do with the handyboard but has anyone tried to access the computer's parallel port with visual basic? =) chen (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: electronics question please help
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Bob - - Here is a link to the 74HCT04 data sheet: (URL) that this helps. - - - Nick - - - Bob Kelly wrote: <snip> (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | electronics question please help
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Hello all, I hope there is a simple answer for this... I have attempted to build the circuit that will allow IR object detection using the Sharp IR detector module and a pair of "high output" infrared LEDs. The circuit I built was the one from (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Book Review ???
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Does anyone have any comments about "The Personal Robot Navigator". It is sold by (URL) about $50. I have read (and continue to read) "Mobile Robots: Inspiration to Implementation" and think it is a *must read*. TIA - - - Nick - - - (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: IR question
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(...) I just looked over the code again, and you're right, I see no reason why it shouldn't work. I guess the comment is just left over from a previous version where it did make a difference. This is not something I can test though, so I'll have to (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | HB to create video displays?
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I am thinking of putting a wireless board-level color or B&W camera on my Mobot and I have a question for all the techies. Is it possible to use one of the different outputs on the HB to interface with the camera to put diagrams on the live picture? (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Need Handy Board memory debugging software
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Gentlemen: I'm having a bit of trouble with my handy board's display. The board itself works, and I've swapped out old display for a new one. I suspect the memory or transparent octal addressing latch to be at fault. I understand you've memory (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Shaft encoder sensors...
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Zagros Robotics sells them for $7.00 ea US (URL) Message----- From: John Vaughn <vaughn@HWS.EDU> To: Kat <khorvath@up.edu> Cc: handyboard@media.mit.edu <handyboard@media.mit.edu> Date: Monday, February 22, 1999 10:23 AM Subject: Re: Shaft encoder (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | RE: IR question
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I found that article listed at: (URL) It was in the January 1999 issue, titled: "Multiprocessor Communications Part 1: Methods for Communicating " Maybe it wasn't 68HC11 specific after all. Gerald (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | RE: IR question
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James, I'm not sure if this is the correct answer since I am new to the Handyboard, but I think it is: If you do not disable the IR Input Interrupt, your transmission could be 'interrupted' by the receiving information and this may mess up your (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | IR question
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Hi Max Davies and everyone, In your documentation (irinfo.txt), you said that we need to disable the IR input interrupt routine before transmitting another signal, what is the reason behind that ? As the IR input and output are both interrupt driven (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | L.E.D. question.
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What are the L.E.D. voltage ratings for the L.E.D's on the interface board I purchased one(at Radio shack) with a rating of five volts. Which should be O.K right? any help would be appreciated. I have to improvise to get such components cheap. Thanx (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Shaft encoder sensors...
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Kathy, Digi-Key has three kinds. The first two look like the "Mobile Robots" type: QRB1114QT-ND $1.58 QRB1134QT-ND $2.83 The third one looks like a much more compact arrangement: QRD1114QT-ND $1.50 These are on Page 552 of the January-March catalog. (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Shaft encoder sensors...
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(...) The Hamamatsu P3062-01 IR photoreflector mentioned in MR was discontinued and replaced by the P5587. This chip has the identical pinout and dimensions as the original. I ordered several from Hamamatsu last year but they are pricey (~$7/ea) in (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | photoreflective sensors
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Kathy($B!)(B) wants photoreflective sensors for shaft encoder. How about the products of Toshiba? See (URL) ***...*** takatsu@isenshu-u.ac.jp School of Science and Technology, Ishinomaki Senshu University 986-8580 Ishinomaki, Miyagi, JAPAN (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Shaft encoder sensors...
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Can anyone help? My team is trying to get a shaft encoder to work, but cannot find a chip that will work correctly to count the black and white stripes on the wheel. We would like to use a chip which can be connected directly to the digital inputs (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Stupid Sonars
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I have a extremely complicated two polaroid sensor set up going on... I had a diode connected to each of the ECHO lines so that I can combine the two lines together... However, no signal passes through this setup... However, I have validified the (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Timer display
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Hi, I would like to display a clock on the LCD display using the real-time interrupt of the 6811. But it does not seen to work at all. Does anyone have done a similar clock on the handyboard ??? Regards, James (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: IR output
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In response to: (...) Could a hardware expert (Fred?) please give a more definitive answer to this? What value resistor should be used? After extensive IR use with just an IR led and no resistor my transmission circuit eventually died... I guess I (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | lib_rs.lis, nevermind.
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Sorry, I wasn't thinking, doh! (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Sharp Ir and Eltec 442 Pyro detector
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Hi guys, I was wondering if anyone of you could help me. I'm trying to connect a hacked version of a Sharp GP1U58Y Ir detector(hacked so it is now analog instead of digital) to the HB so as I could use it for Ir Proximity sensing or distance (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | lib_r2.lis ?
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IC can't seem to find: /usr/local/lib/ic/lib_r22.lis Is this important? Where is it (not anywhere on my box.) Thanks all. (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Expansion Board Problem
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Yes there are two four pin connector along the fornt edge of the expansion board that connect to J13 and J8 on HB, one 8 pin (2 rows of four) that connects to jumper J6 on the HB and one 10 pin that plugs into the expansion bus J3 on the HB. Hope (...) (26 years ago, 22-Feb-99, to lugnet.robotics.handyboard)
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| | Downloader, nevermind
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I have the ic-src-unix file, and see it in the tree, sorry. (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Diodes for sonar don't cut it
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I promised to update all you ultrasonic types on my progress (or lack thereof) in connecting two sonar modules to the HB. Well, I still haven't figured out if there's a way to connect two sonar module echo lines to the same TIC port on the HB. The (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Downloader for Unix
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Where might I find the downloader program dl for Linux? I know it exsists, but cannot find it on the MIT/Handyboard site. Thanks. (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re:
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Will - - I'm also working on implementing multiple sonar sensors on the HandyBoard. My intention is to mount 4 transducers using Adam Cox's multiplexor. At present I'm struggling with the software attempting to reduce false readings and increase (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re:
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(...) I'm still working out the best way to connect two sonar modules to the HB (using two complete module board/transducer sets). Both modules ping, but I'm getting signal contention with both echo lines connected to the same TIC port. Probably the (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Sonar Sensors
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(...) I don't know much about electronics, but here are a few hardware questions that others have asked me: Can you verify that each sonar works ok all by itself? Are you using two separate sonar module boards, one for each transducer, or are you (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Expansion Board Problem
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We assembled the HandyBoard ourselves and everything seemed to go great. However, the new set of analog inputs does not seem to be reading in values correctly. The input always seems to be stuck at 250 (The handyboards inputs still work fine.) I've (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Sincere apologies
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Hello every one, I sent the unsubscribe request by mistake to the list instead of Fred. take care Amit =) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re: msleep function in ICC11?
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Dear Ranjit, I do not know much about ICC11, but if you can get the system time using some function, you can write an empty loop using while{} or do{}while until the time delay is over. Yours sincerely, Nitin (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re: Type conversion.
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Dear Federico, Typecast the integer into float. ie write the statement as dtemp=(float)temp*3.5 Refer to any C book for information on typecasting. Yours sincerely, Nitin (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re: please remove me from mailing list
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For getting out of the mailing list, send an e-mail to Fred Martin at fredm@media.mit.edu and not to the mailing list. Read rules sent to you when you first joined the list. (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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| | Re:
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See www-personal.engin.u.../~johannb/ for a detailed paper on EERUF (Error Eliminating Rapid Ultrasonic Firing). Using the algorithm described there, he used 12 sonar sensor at the same time - allthough I don't know if the HB is powerfull enough for (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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