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 | | SPI
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| |> 2) Can I just connect the 4 SPI pins to each other (SS to SS, MISO to MISO, |> MOSI to MOSI, SCLK to SCLK), or do I need to cross connect MISO and MOSI? |> Are there any termination requirements, etc? | |MISO = master in slave out |MOSI = master (...) (28 years ago, 20-Sep-96, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | (no subject)
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| this could also be a problem with the cable betw the interface/charger and the host computer. does the green led on the interface go on when plugged into the host CPU? if not, this is indicative of such a cable probl. however, the pwr light on the (...) (28 years ago, 19-Nov-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: as11_ic
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| There are two fundamentally different ways to go about writing assembly language programs for the Handy Board: 1. Write them as callable functions for the Interactive C environment, using the as11_ic program. 2. Scrap Interactive C entirely, and (...) (28 years ago, 12-Feb-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Port E inputs
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| the 6.270 has a diff anlg ckt. remember, the app b is generally applicable, but some details are different. -f In your message you said: (...) (28 years ago, 14-Feb-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Motors & handyboard
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| (...) 3v toy motors are noisy little buggers and were never designed to be anywhere near a microprocessor. if you reduced the hb motor battery supply to 3v, you might have a chance. at 9v, i really doubt it. -f (...) (28 years ago, 15-Feb-97, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | 6.270 1998 videos available
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| ------- Forwarded Message Received: from MIT.EDU (SOUTH-STATION-ANNEX.MIT.EDU [18.72.1.2]) by aleve.media.mit.edu (8.8.7/ML970927) with SMTP id BAA04302; Fri, 13 Mar 1998 01:08:38 -0500 (EST) Received: from DEPARTMENT-OF-ALCHEMY.MIT.EDU by MIT.EDU (...) (27 years ago, 13-Mar-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: 64K RAM?
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| This is a common question, so I went ahead and put an answer in the FAQ. Take a look at: (URL) what it now says: ---...--- IS IT POSSIBLE TO EXPAND THE HANDY BOARD'S MEMORY TO 64K? Actually, this is hard to do. Here's why: 1.There is a compromise in (...) (26 years ago, 15-Apr-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | HOW TO UNSUBSCRIBE
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| This is the periodic unsubscribe message. To unsubscribe from the Handy Board list, please send mail to fredm@media.mit.edu He is the only one who can remove you from the list. That way, when you send mail to fredm@media.mit.edu you're not telling (...) (26 years ago, 30-Jun-98, 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: HB Serial Communication
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| yes, but you have to use the atypical "network style" cable if you are plugging two HB's together. see (URL) more info. f. In your message you said: (...) nt's serial code? (...) een two HBs and one of them turned off and smoke came from around the (...) (26 years ago, 29-Sep-98, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Handyboard power supply
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| what is the amp-hour rating of each cell. standard AA rechargables are 500 to 800 mAh. if your cells are significantly different than this, the charging might not work properly. generally though i don't see too many probs with this. you might need (...) (26 years ago, 6-Jan-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: A newbie question
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| if your robot is not allowed to even partially cross the duct tape, you must have an additional inner marking that the robot can see so it knows it's near the "danger zone" and can change direction. f. (...) (26 years ago, 9-Jan-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: help again
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| check that the RxD line on the hc11 is properly pulled up to +5v through R15. also, make sure you are *HOLDING DOWN* the STOP button until the BATT light goes off. this wasn't clear from your msg. finally, try getting the HB into boot mode with the (...) (26 years ago, 16-Jan-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | (no subject)
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| i am sorry, but i have never readied that software. to debug, use a logic probe and check all of the 28 pins of the RAM chip. address, data, and enable lines should be flashing when the HB is turned on. if you see a line stuck at 0 or 1 that might (...) (26 years ago, 17-Jan-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: IC
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| i am unable to reproduce the problem. perhaps comms between IC and your board are still unreliable. try writing a program that repeatedly prints to the LCD screen the result of 123 * 2. my guess is that it will work perfectly. also, make sure you (...) (26 years ago, 19-Jan-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: Toy motors
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| right, this is a good answer. you buy a device called an "electronic speed controller". this connects like a servo to the HB (3 wire connection) and has outputs to drive high current DC motors. you also connect a separate power supply to the device. (...) (26 years ago, 23-Jan-99, 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: BEEPER
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| it *might* be comms problems between the HB and your PC. if you can find an old 386/486, try the downloader on that. also, try booting your PC into DOS mode and see if things work better. f. In your message you said: (...) (26 years ago, 7-Feb-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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| | Re: help about part C3
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| use Digikey P6305-ND or P5417-ND. both are 470 uF electrolytics, axial leads (that is, leads sticking out opposite ends) and are 16 mm long and 8 mm in diameter. in other words, they're the right value and they'll fit. F. (...) (25 years ago, 13-Apr-99, to lugnet.robotics.handyboard)
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fred
(score: 1.028)
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