 | | Re: large # of digital I/O's
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This chip is REALLY handy.. I worked some time with it, and liked it.... Bastiaan ---...--- (...) $4 (...) (28 years ago, 10-Feb-97, to lugnet.robotics.handyboard)
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| | Re: expansion board schematic posted
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Hi Fred The "new" spec sound's great ! I'd also like to see a bit more digital I/O on any expansion board, and the extra 8 CMOS outputs are just what I (we) need. Thanks Scott (...) Martin'" <fredm@media.mit.edu> (...) (28 years ago, 10-Feb-97, to lugnet.robotics.handyboard)
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| | Re: L293D Piggybacking
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Yes, most people have found that this works. -Fred -- This message was composed using Articulate Systems' PowerSecretary, a Macintosh-based speech-to-text dictation system. Please forgive any sloppiness in the formatting. Thanks. -Fred In your (...) (28 years ago, 10-Feb-97, to lugnet.robotics.handyboard)
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| | L293D Piggybacking
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My question is, can I piggyback the L293D's and what will this increase my max current output to? I am going to just one motor from port 0 and the other from port 3 so as possibly eleminate smoking any more 293's. What do you think? Bill Rose Fort (...) (28 years ago, 10-Feb-97, to lugnet.robotics.handyboard)
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| | Not enough Servo ports on Expansion board
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Hello, Iwould suggest increasing the available servo ports on this. Servos are widely available, getting cheaper, and compact for robotics. This could have been facilitated on the original Handy board, but nevermind. I'm already using my method on (...) (28 years ago, 9-Feb-97, to lugnet.robotics.handyboard)
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| | HB does not enter on bootstrap mode
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I followed step 4.4 in the HB assembly manual. I hold down STOP-SW while powering on the board, then the battery LED light for 1/3 s, but the power light does not go OFF. I have checked that the MODA signal and the RESET are present at the 68HC11, (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | Re: AS11 IC?
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You can get the PC version of everything you need to compile .ASM source code into IC compatible .ICB files at (URL) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | Re: FW: expansion board schematic posted
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Sean, Using two of the SPI port pins, and a MUX and DEMUX, you should be able to gang together four of the Polaroid ultrasonic sensors. See if the code below makes sense. I wrote it a while ago, when I wanted more Polaroids, but - I didn't actually (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | Re: expansion board/multiple sonar
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It's actually a '374 or '373 for outputs. I guess you could use them for inputs too, but you're better off using a '244 for input. Or even a '574, '573, '541, these chips put inputs on one side and outputs on the other. Very convenient. Even (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | Re: expansion board schematic posted
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(...) I would love to see more digital outputs put on the expansion board. Just out of curiosity, is the Poloroid sonar connection still going to be on the board. That is what I am waiting for most of all. Keith (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | To Add my 2.5 cents
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I think the expansion board is A-OK as it is. (I'm being rather selfish since the Hartford Firefighting contest is in April). -Jim (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | large # of digital I/O's
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Check out the 82C55. In a 40 pin package, it has 24 bits of digital bidirectional I/O, and can be bit- or byte- addressed. It's cheap (like $4 or so in quantity). The 40-pin DIP package is big, but not compared to 3 20-pin DIP packages which it can (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | FW: I agree-
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Servos outputs are good, but generic handyboard serial output to Scott Edward's Serial Servo Controller would be faster to implement and design, much and simpler to work with, and would be extensible to other serial projects too. (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | FW: expansion board schematic posted
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I'd agree with this option - I don't need any more inputs, but I do need 4 logical outputs 2-4 Hi-current outputs Serial communications 1 (preferably 2) sonar connectors I could really use that second sonar. I don't suppose there is a way you could (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | Re: expansion board schematic posted
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While I've only been working with the Handy Board for a week or so, I would also like to see several more outputs added. Perhaps some combination such as 8 digital (CMOS) outputs, and 8 of the dual-transistor types. If you could rig it up with (...) (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | Dum spiro spaero (While I breath, I hope)
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(...) Thanks, Randy, my good man! Sorry if took a bit of playing with good old "honoris studioso". But you can't blame a guy for trying. Especially if it yields results. :) Alex. (28 years ago, 8-Feb-97, to lugnet.robotics.handyboard)
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| | IC development
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(...) OK, Uncle! I apologize that, at times in the past year, IC development has taken a back seat to our 32-bit C environment and vision system development. We realize that we have made a commitment to the community to come out with IC 3.1, and we (...) (28 years ago, 7-Feb-97, to lugnet.robotics.handyboard)
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| | Re: Expansion board
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Hi Everyone, We (Digital Micro Systems) have an expansion board which we've been beta-testing for a while, but have not released yet. This seems like an appropriate time to ask for any feedback regarding the design before release. Anyway, the (...) (28 years ago, 7-Feb-97, to lugnet.robotics.handyboard)
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| | Re: IC
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(...) from commitments. How MITesque! That is why we had to drop HB development for our equipment and look for another platform. If you are in the same situation take a look at (URL) You might like it. Alexander A. Chaihorsky V.P. Engineering, (...) (28 years ago, 7-Feb-97, to lugnet.robotics.handyboard)
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| | (no subject)
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(...) from commitments. How MITesque! That is why we had to drop HB development for our equipment and look for another platform. If you are in the same situation take a look at (URL) You might like it. Alexander A. Chaihorsky V.P. Engineering, (...) (28 years ago, 7-Feb-97, to lugnet.robotics.handyboard)
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