 | | Re: Wire wrapping sockets
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(...) Sure, over 20Mhz or so. I've breadboarded 16Mhz 80286 systems on these things. Don't use the long connections (along the edge) of the board for signals. Also the chance of any given breadboard connection being flakey is about 1 in 200. So if (...) (28 years ago, 4-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Wire wrapping sockets
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(...) Check out www.cgntech.com, these guys have wire wrap sockets for the 68HC11. But they also have something _much_ cooler. They have a small board which consists of a 68HC11, RS-232 circuit, address latch, and buffer logic, with wire wrap pins (...) (28 years ago, 4-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Wire wrapping sockets
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Hi, Sorry this is on a different note. I was wondering what the advantage is of using wrie wrapping over breadboarding. Someone told me that breadboarding has alot of capacitance and will slow down the circuit at high speeds. Is this so? ---...--- (...) (28 years ago, 4-Apr-97, to lugnet.robotics.handyboard)
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| | Wire wrapping sockets
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I am thinking of building a second handyboard for myself but I want to make a few changes to the design. I need to know if anyone knows of a place to buy a 52 pin PLCC wire wrapping socket for the 68hc11. I am aware that there are adapters to (...) (28 years ago, 4-Apr-97, to lugnet.robotics.handyboard)
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| | Re: Mini SSC - Scott Edwards
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(...) Stop the presses! You should have gotten documentation with the SSC but since you are apparently missing it (and its small anyway) the relevant information is that the Mini-SSC uses a serial interface to control its servos. You must send down (...) (28 years ago, 4-Apr-97, to lugnet.robotics.handyboard)
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| | 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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