 | | more address lines on expansion board
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Hi Brian, When Fred and I designed the Rev 2.0 6.270 controller, we consciously made the expansion bus small and simple. For most expansion devices, the pre-decoded chip selects make more sense than sending all the address lines, since the latter (...) (28 years ago, 8-Apr-96, to lugnet.robotics.handyboard)
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| | Pcode instructions?
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OK. I know this is going to be a long shot, but here goes: Are there any docs on the pcode? I.e. is there some way that I can learn what I need to learn to modify the source code pcode.asm besides reading the file pcode.asm and tearing my hair out? (...) (28 years ago, 8-Apr-96, to lugnet.robotics.handyboard)
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| | Re: Handyboard expansion status
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(...) I don't have one of the beta versions of the expansion board, but I've been building my own expansion boards and putting them on the HB. One thing that I've found is problematic with the HB design, in regards to expansion board design, is that (...) (28 years ago, 7-Apr-96, to lugnet.robotics.handyboard)
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| | http://lcs.www.media.mit.edu/groups/el/projects/handy-board/maillist.htm
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i would like to use the list. thankyou, Jeff (28 years ago, 7-Apr-96, to lugnet.robotics.handyboard)
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| | mseconds
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Is there a way to get sub-milisecond times measured with the handyboard? I was thinking of trying to modify msecond but I can't look at it now that it is a primitive. Dirk (28 years ago, 7-Apr-96, to lugnet.robotics.handyboard)
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| | Expansion board
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How many Polaroid range sensors can the expansion board have up to. One? What kind of signal does it produce? (29 years ago, 5-Apr-96, to lugnet.robotics.handyboard)
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| | Re: High current motors
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I think the question on how to run higher current motors has got to be the most asked question here. Maybe we should add more info to the FAQ or something. Anyway, here is Chuck McManis' solution from a while back. I hate to send out something that (...) (29 years ago, 5-Apr-96, to lugnet.robotics.handyboard)
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| | Re: High current motors
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How about this one? ...to enable two directional rotation. ___...___ motor ___...___ | | | | -> / / -> |/ |/ |/ |/ ---| ---| ---| ---| | |\ | |\ | |\ | |\ | \ | -> | -> | \ | | | | | | | | | | | | | | | | | vcc | gnd | gnd | vcc | | | | | | | | | | (...) (29 years ago, 4-Apr-96, to lugnet.robotics.handyboard)
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| | Re: High current motors
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Do you have to choose a transistor that will switch somewhere near and below 9 volts? Cause Fred mentioned that the handyboard is rated for 9V motors. But, does this mean that the pulse generator make 9V square waves? (...) (29 years ago, 4-Apr-96, to lugnet.robotics.handyboard)
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| | RE:
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It would work but it would be uni-directional. --Chuck ---...--- From: MAR ERICSON[SMTP:mar@cooper.edu] Sent: Wednesday, April 03, 1996 11:27 AM To: handyboard@media.mit.edu Does anyone know if you can do this to the L293D chip to increase the (...) (29 years ago, 3-Apr-96, to lugnet.robotics.handyboard)
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| | Question !
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What should be the nominal voltage of the DC-Motors for the handyboard, I know that in miniboard its 6v - 36v. Thanx. Hachemi. (29 years ago, 3-Apr-96, to lugnet.robotics.handyboard)
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| | (no subject)
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Does anyone know if you can do this to the L293D chip to increase the current? _____- motor +________ / | L293D |/ | motor output___...___| + |\ \->- baterry | | - | | | | ---...--- The transistor in the center would be a high current one. Would (...) (29 years ago, 3-Apr-96, to lugnet.robotics.handyboard)
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| | expansion interface
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How is the beta-test of the expansion interface progressing? Anybody care to estimate when the design might be finalized so I could purchase one? How much would a kit be expected to cost? \---...---\ \ John Mathews jkm@po.cwru.edu \ \---...---\ (29 years ago, 2-Apr-96, to lugnet.robotics.handyboard)
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| | 26 VDC motor
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Using the handyboard, can we drive a DC-motor which has a nominal voltage of 26 volt, (the starting current is less than 600mA). Thanx. Hachemi. (29 years ago, 2-Apr-96, to lugnet.robotics.handyboard)
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| | Re: hooking up to R/C car
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(...) A really wild/money is almost no object idea would be to get electronic speed controls from radio controlled cars. These things can control up to several tens of amps continuously. You can control them like controlling a servo. Their cost is (...) (29 years ago, 1-Apr-96, to lugnet.robotics.handyboard)
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| | Re: hooking up to R/C car
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(...) There aren't any control electronics to this thing at all, really. There's four switches on the control box, some wires going to the vehicle, and four motor/gearbox combos in the machine that the wires supply power to. No drivers, no heat (...) (29 years ago, 1-Apr-96, to lugnet.robotics.handyboard)
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| | hooking up to R/C car
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(...) We've had success interfacing digital signals directly to the drive circuitry that's already present on some R/C vehicles. The problem you're running into is that R/C motors just draw too much current for 293's. (If you look at the controller (...) (29 years ago, 1-Apr-96, to lugnet.robotics.handyboard)
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| | *WARM* L293D's on Handyboard
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Today I ran out to Toys 'R' Us and bought a wired-remote controlled excavator to serve as the base for my HandyBoard. It seems to be causing me a little problem, though. Before I removed it from the controller that contained the battery (...) (29 years ago, 1-Apr-96, to lugnet.robotics.handyboard)
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| | New version of Mac IC: 3.1 beta 5
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A new beta version of Interactive C for the Macintosh, Mac IC 3.1b5 is now online at: (URL) and improvements from beta 4: * Printing is now enabled * Definition files and board recognition are better handled * Files, functions, and globals info (...) (29 years ago, 1-Apr-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA
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Note that the spec sheet for the L293D states that the package can only dissipate 5 watts. With a voltage drop of 1.3 volts that is 3.85 amps total through all drivers. However, since that is the absolute maximum rating your probably looking more (...) (29 years ago, 30-Mar-96, to lugnet.robotics.handyboard)
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