 | | Re: power supply
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I have never done much battery work and I was wondering if using a separate battery with a common ground to the HB has caused anyone any problems during charging or any other situation. I have common grounded a 3v battery pack to the HB supply to (...) (28 years ago, 4-Apr-97, to lugnet.robotics.handyboard)
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| | Re: photo sensor quesion.
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If you have a device that uses the handyboard supply to generate voltages then just voltage divide the output to the correct 0-5v and input on the analog ports. If you are using phototransistors or something similar there are lots of photo circuits (...) (28 years ago, 4-Apr-97, to lugnet.robotics.handyboard)
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| | Re: LCD Panel Substitute
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Any 16x2 LCD with a Hitachi HD44780 controller chip will work. I got mine from wirz electronics at www.wirz.com (go to serial lcd displays and they sell the LCD separate for $8 bucks!) There are lots of displays that use (...) (28 years ago, 4-Apr-97, to lugnet.robotics.handyboard)
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| | Mini SSC - Scott Edwards
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Hi, I am working in a group to make a six legged robot. We are using the Mini SSC from Scott Edwards to control the servo motors. We've connected the digital output #9 from the Handy Board to the S(in)#2 pin of the SSC. We also connected the signal (...) (28 years ago, 4-Apr-97, to lugnet.robotics.handyboard)
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| | Re: photo sensor quesion.
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Solar panels? ---...--- 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 ---...--- (...) (28 years ago, 3-Apr-97, to lugnet.robotics.handyboard)
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| | Re: power supply
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I've found that alkaline batteries work well. I used it to power motors too and they seem to work fine. I tested a flashlight bulb and found that it drew 0.79 A at the rated voltage. So alkaline, D-cells at least, can handle the current. ---...--- (...) (28 years ago, 3-Apr-97, to lugnet.robotics.handyboard)
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| | photo sensor quesion.
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I understand how a photoresistor that varies in restistance can be connected to the analog inputs. But what about the photelectric elements that generate voltages varying with light. (28 years ago, 3-Apr-97, to lugnet.robotics.handyboard)
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| | HB Design Question--??
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+---...---+ | NOTICE! I'm posting from a host that is not always available. If your | | email to me bounces or you want to be sure, use 'brat@naxs.com'. THNKS | +---...---+ Fred (or anybody)- I'm doing some last minute sanity-checking on a project (...) (28 years ago, 3-Apr-97, to lugnet.robotics.handyboard)
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| | power supply
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Anyone? I'm wondering if a 9V Alkaline battery could replace the battery pack in the HB. I'm merely going to use the 9V battery to power the HB and its memory. I'm not going to use any of the 5V-line supplied by the HB. In other words, all the (...) (28 years ago, 3-Apr-97, to lugnet.robotics.handyboard)
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| | Re: LCD Panel Substitute
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Are you overlooking the obvious source of LCD panels - Timeline? I only mention this because it hasn't been mentioned in the postings. Timeline is listed on the Handy Board web site, and they are about the cheapest supplier. I got a bunch of (...) (28 years ago, 3-Apr-97, to lugnet.robotics.handyboard)
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| | 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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