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 | | Re: Digital outputs.
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| Thanks David for a nice explanation of how to add I/O using shift registers. Let us not all forget that the HB does have two uncommitted digital output ASIDE from the four SPI pins: PA7 (a bidirectional pin which is marked as digital input #9) and (...) (27 years ago, 1-Jan-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: unsubscribe
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| dear amit (& others), sending messages to "handyboard" will NOT get you removed from the list. The only way to get removed from the list is to read the instructions and follow them. These instructions may be found at (URL) luck. this may be a (...) (26 years ago, 21-Feb-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Weird LCD problems
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| David -- Soldering d0 to +5v certainly can't help; it should be connected to the data bus (pin 9 of the 6811, pin 11 of the RAM, and pin 3 of the 'hc373). (see the cpu and mem schematic). With board power off, check continuity among these (...) (29 years ago, 22-Feb-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Serial Com. in IC
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| yes, it is possible for an ic program to use the serial port. see randy's instructions at (URL) this question was answered and archived in Handy Board e-mail archive. It would be good if people try a quick search through there before posting to the (...) (29 years ago, 7-Mar-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Will the SN754410 support...
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| if the worst-case current is 1.5A, you're probably OK -- the SN754410's have thermal protection for over-current conditions. they're rated for an amp continuous, so you're not too far out of bounds. one cause for concern is if the 1.5A measure is (...) (26 years ago, 2-Feb-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | real spam on the list
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| hi all, as is now evident, handyboard@media.mit.edu has been picked up by genuine spammers. so i'm going to have to bit the bullet and install better list software. hopefully this will have the side-effect of trapping 'unsubscribe' msgs, though if (...) (25 years ago, 6-Jun-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | HB list now being archived
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| Greetings HB users, I have enabled archiving of our list. The archive is at: (URL) is linked from the mailing list page off of the main page. BTW, some people have asked if they can receive the list's mail in digest form. The answer is "sorry, no." (...) (29 years ago, 2-Feb-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Handyboard assembly
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| Ah, the classic "I built it and it doesn't work" story. Did you follow the incremental building instructions? I take it the answer is no. My suggestion is to pull all of the chips, and run through the series of incremental tests in the building (...) (29 years ago, 7-Mar-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: HB failure
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| the buzzing indicates that the LCD isn't connected right (or is dead, as you are guessing). first, please be sure that all 14 pins of the LCD are inserted properly into the LCD connector. then (if still probs), try downloading Kent Farnsworth's (...) (26 years ago, 1-Feb-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | charger
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| what i am doing is building a battery charger for back-up batteries to be used with the handyboard, so i don't have to wait for the batteries to charge. can i use the schematic that i found in the handy board technical reference manual except (...) (25 years ago, 11-May-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Source for LCD's
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| (...) From the components supply list at (URL) compatible retail display is the Hitachi LM-052L. Supplier info for Hitachi parts is available at (URL) Other valid manufacturers/part numbers: Alps LDS7A1792A; Optrex DMC16249. (...) Electrically, any (...) (28 years ago, 10-Jul-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | expansion board schematic posted
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| Hi all, I have put on the web site a schematic drawing of the expansion board as it currently stands. I would appreciate any comments regarding the feature set. In particular, I'm not sure what's best to do with the two digital outputs: * just (...) (28 years ago, 7-Feb-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Problems connecting 2 Handy Boards
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| The code found at (URL) was intended for connecting a Handy Board to the host PC. It is possible to connect two Handy Boards, but you must use a NETWORK style RJ11 cable, rather than the usual TELEPHONE style RJ11. See the FAQ, under entry "The R11 (...) (26 years ago, 15-Apr-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: A few questions...
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| a few notes... in the faq there is a discussion about how to measure the resistance of a motor coil, as a way of determining if it's compatible with the hb. also in the faq, is a description of a mod that will allow using a separate power supply for (...) (26 years ago, 5-Feb-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | (no subject)
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| (...) OK, take a look at (URL) installed a link for you. Also, did you know the IC manual is on the web? It is at (URL) I am not sure, but I would bet there is an implementation of GhostScript for Amiga. Check it out. This would let you view (...) (28 years ago, 20-May-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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fred
(score: 1.028)
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| | Re: Is 18V correct?
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| this is correct. normal dc adapters are unregulated and there is a reciprocal relation between voltage and current. when you just plug it in and and measure voltage, current is 0 and hence voltage is higher than the spec. if you draw the rated 500 (...) (28 years ago, 29-Jan-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: HELP!
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| when using DLM, does the downloader make it to the second stage of the download, indicating "synchronized"? also, when attempting to download "config0c.s19," do you give DLM the command line flag indicating to burn EEPROM and not RAM? you must tell (...) (28 years ago, 18-Feb-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Congratulations (I think ????)
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| Hi Scott (& everyone), Yes, two days ago the LEGO company officially launched "LEGO Mindstorms," which is a new brand and product line inspired by the MIT Programmable Brick research. Scott -- thanks for noticing, and digging up the URL (URL). I am (...) (27 years ago, 29-Jan-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: two servo code
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| (...) Actually, none of the default functions in pcode_hb.s19 actually use the IR transmit line -- you have to load in someone's ir transmit icb file. so that line is completely up for grabs. mike, it shouldn't be too ahrd to work from Randy's (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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