 | | Re: BCD
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Mar, The half carry (H) bit in the CCR sets if there is a carry from bit 3 to bit 4: in other words when there is a carry from the low hex digit to the high hex digit. Only the DAA instruction is affected by the state of H. For example: LDAA #$5A (...) (28 years ago, 3-Apr-97, to lugnet.robotics.handyboard)
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| | Re: BCD
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Yeah, it helps alot. Thanks. I guess the half-cary is for adding to the next significant 4 bit word. And the current word, including overflow, is then subtracted by ten (1010), if the half-carry is flaged, to yield the proper BCD word. Is this what (...) (28 years ago, 3-Apr-97, to lugnet.robotics.handyboard)
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| | RE: LCD Panel Substitute
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I recently got mine from Marshall (www.marshall.com). When I ordered mine about a month ago, they had a bunch of them in stock. .... Jim Montague ---...--- From: Bill Conroy Sent: Wednesday, April 02, 1997 3:19 PM To: handyboard@media.mit.edu (...) (28 years ago, 3-Apr-97, to lugnet.robotics.handyboard)
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| | LCD Panel Substitute
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I am having an extremely difficult time finding a source for the Hitachi 16x2 LCD panel. I am wondering what an appropriate substitute would be. I am looking at the following part from page 53 of the Mouser Electronics Purchasing Manual #58: Mouser (...) (28 years ago, 2-Apr-97, to lugnet.robotics.handyboard)
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| | Re: BCD [DAT]
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(...) As far as BSD goes; every decimal digit is represented by four binary digits: decimal BCD 0 0000 1 0001 2 0010 3 0011 4 0100 5 0101 6 0110 7 0111 8 1000 9 1001 so that a number like 3725 would be represented by 0011 0111 0010 0101 I've never (...) (28 years ago, 2-Apr-97, to lugnet.robotics.handyboard)
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| | BCD
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Does anyone know the details of how a BCD number is stored? I'm unsure as to what a "half-carry" is in HC11 CCR. It would be great if someone can provide a little example. :) ---...--- ericson mar Master of Engineering Candidate Project: Mobile (...) (28 years ago, 2-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Shaft Encoders
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One of the advantages of using a shaft encoder is: For you to get the same "resolution" as a shaft encoder with a potentiometer, you must have a very precise pot. Some optical encoders can have 500 "ticks". But... a normal encoder does not tell (...) (28 years ago, 2-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Robot classification
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Katt, Good question, and I liked Tom's response. If I may I'll add my two cents. From Tom's list: (...) Definitely and its not the kind of software they teach these days. When's the last time a program crash in your CS-101 class put a hole in the (...) (28 years ago, 2-Apr-97, to lugnet.robotics.handyboard)
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| | Shaft Encoders
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Does anyone see a problem with using the pot thats built in a RC servo as its shaft encoder. I have modified it so that it makes contact once every revolution. Would this mechanical contact create any "bounce" that would interfere with the enoding (...) (28 years ago, 2-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Robot classification
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(...) Kat, That question is one that a LOT of schools are asking right now. At the present time (in my opinion) it is a blend of different kinds of engineering, which is very much determined by the type of project that your doing. For example, (...) (28 years ago, 1-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Robot classification
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Katt97> What sort of engineering would robots, as a whole, be put in? Katt97> Or would robotics be considered a blend of different kinds of Katt97> engineering? -Kat Yup, blend. You got software engineering (art?) for the code to make it work. You (...) (28 years ago, 1-Apr-97, to lugnet.robotics.handyboard)
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| | Robot classification
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What sort of engineering would robots, as a whole, be put in? Or would robotics be considered a blend of different kinds of engineering? -Kat (28 years ago, 1-Apr-97, to lugnet.robotics.handyboard)
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| | Piggybacked L293's on HB causing VR problems?
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One of our HB's has been "snake bit" for the last few weeks, exhibiting sporadic downloading problems, etc. We are running the piggybacked L293's (ala 6.270 board) on it, and the TI chips (non-piggybacked) on the others (which don't have problems). (...) (28 years ago, 1-Apr-97, to lugnet.robotics.handyboard)
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| | Re: AS11
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No, I didn't find an AS!! manual on the HB HP. Do you have one? Where did you get it from? It would really help. Though by now, I deciphered most of the language already. It still would be great to have as a reference. ---...--- ericson mar Master (...) (28 years ago, 1-Apr-97, to lugnet.robotics.handyboard)
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| | (no subject)
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(...) PLEASE, when you want to share a large file with members of the handyboard mailing list, first ask who wants the file and then send it to *ONLY* those people. I was gone last week and unable to check my mail and when I came back I found that (...) (28 years ago, 1-Apr-97, to lugnet.robotics.handyboard)
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| | Re[2]: IR concept
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Chuck, I love the wire whisker! Have you got any more tricks and tips I could steal??? Richard ___...___ Reply Separator ___...___ Subject: Re: IR concept Author: cmcmanis@freegate.net at Internet-Mail Date: 29/03/97 00:58 Adam wrote: > An (...) (28 years ago, 1-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Digital Outputs
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Gordon, The steps on how to turn the SPI into 4 digital outputs are in the HB FAQ - off the top of my head I think it goes something like this.... poke (0x1009, 0x3c); /* set the 4 DDR bits for SPI (reg D) */ bit_set(0x1008, 0b00000100); /* set MISO (...) (28 years ago, 1-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Analog ports....
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To: Demian Bigelow <dbigelow@bu.edu> Subject: Re: Analog ports.... Cause I was wondering how well it works. To my understanding, analog phototransistors' outputs depend on intensity. I found that variations in the colors of surfaces reflect (...) (28 years ago, 1-Apr-97, to lugnet.robotics.handyboard)
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| | Re: AS11
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You have an assembler manual? I only have the HC11 reference. Where do you get one of those? Thanks! :) ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (212)353-4356 Department of Mechanical Engineering (...) (28 years ago, 31-Mar-97, to lugnet.robotics.handyboard)
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| | Servo encoder.
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Does anyone see a problem with using the pot in a modified servo and an encoder. I have modified it so that it makes contact once every revolution. Would this mechanical contact create any "bounce" that would interfere with the enoding ticks. (28 years ago, 31-Mar-97, to lugnet.robotics.handyboard)
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