 | | 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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| | Re: PA7
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(...) no,this is wrong. The servo output is J2 - 9, not J2 - 15. (...) you need a 5 volt source to power the servo. The Handy Board 5 volt supply can be used, but this will put a lot of stress on the system regulator. It would be better to get a (...) (29 years ago, 30-Mar-96, to lugnet.robotics.handyboard)
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| | PA7
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Another Q or 2 about using the servo capabilities of the handy board. It has been established that the servo motor output is actually digital output 9 (J2-9) (position numbered 15 (on the silk screen) of connector J2) 1) Is there a separate (...) (29 years ago, 30-Mar-96, to lugnet.robotics.handyboard)
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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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| | Re: 600 mA
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Thanks. This helps clarify things about the motor features alot. I was looking into transistors for the first time. I was wondering if you can connect the L293D output to the base of a high current transistor. ...and the collector and emmiter in (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | Re: two servo code
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(...) Fly-in-the-ointment: I'd still rather disable the IR Xmit function than the buzzer. My application would like to use the buzzer to communicate audibe condition codes. I appreciate Randy's effort to sacrifice the piezo buzzer so we can supply (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | two servo code
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(...) Hey Randy, it would be cool if you could modify that code to use TOC3, which is free and available on the expansion bus, rather than disabling the piezo. Maybe somebody else wants to do this. -Fred (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | digital output
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Hi, I am wondering if there is any means of digital output other than the motor ports such as the miniboard has. The miniboard has the bank of digital i/o ports. The handyboard has the digital input but I am not sure about digital output other than (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 1050mA Dc Motor
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With teh TI chips, you might get away with it, just do not stall the motor for long. It will not work with the L293Ds, they are rated at 600 ma ( they might work for awhile) (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | pcode, libraries for two servos
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For people interested in using the piezo output line for a second servo, I've put libraries and new pcode's online at (URL) under "IC-related packages"). The new pcodes disable the beeper code in IC, and free up the line for other uses. The library (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA Limit
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(...) from the L293D ground? yes, this would be correct. Well, there would be 2.4 amps running through the chip's power source, into the motors, and into ground. ...totaling 4.8 A runniing throught the entire chip fro m a power dissipation (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | Re: expansion board
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the code has not yet been written. My hope was that some people who got expansion boards might want to do some of the work themselves. For example, the code for dealing with the analog ports can be taken from previous code for the 6.270 board and (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | expansion board
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Hi Everyone, I was wondering if someone could point me to where all the software for accessing the Handy Board's expansion board features are located. Specifically, I was wondering if there is code to access the additional A/D ports, servos, (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA Limit
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(...) OK. I just wanted to make sure I'm understanding the material. So, my guess is that in order to drive the 4 motors off one chip, you would have to ground the other lead of each motor? So, does that mean that there is 2.4 A source from the chip (...) (29 years ago, 29-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA Limit
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In your message you said: (...) Yes, that is what I mean. -Fred (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Miniboard/Handyboard.
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it is only a difference in software. The Handy Board software does eight levels; the mini board software---which is different---does 16. -Fred -- This message was composed using Articulate Systems' PowerSecretary, a Macintosh-based speech-to-text (...) (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA Limit
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(...) You mean running FOUR motors uni-directionally from ONE L293D chip, right? ...and TWO motors bi-directionally from ONE L293D chip? (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | Miniboard/Handyboard.
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The Miniboard manual says that it can vary the motor speed at 16 levels at either direction. It was mentioned earlier that the Handyboard can vary only 8. Is this correct? I'm seeing that the Miniboard motor drivers has a higher resolution than the (...) (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA Limit
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I just realized that getting 1200 milliamps running two motors bi-directionally is equivalent to running four motors uni-directionally at 2400 from a total power dissipation standpoint. I.e., there are still 600 milliamps running through each (...) (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 600 mA Limit
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The 600 milliamp limit is per channel, but for a given motor, two channels are wired in series. So you don't get 1200 milliamps per motor but only 600. This would still yield 1200 milliamps per chip, since there are drivers for two motors. Also, if (...) (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | 600 mA Limit
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I was wondering if the 600 mA limit on the motor driver chip is a limit for the total source current of all four motor outputs or for each individual motor output. If its 600 mA for each motor output,...will the chip get hot when running with 4 (...) (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | Re: 1050mA Dc Motor
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If you use the Texas Instruments replacement for the L293D chip, you should be in business. Also, mini board questions should go to the robot board mailing list (see enclosed). -Fred -- This message was composed using Articulate Systems' (...) (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | 1050mA Dc Motor
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Hi everybody I want to know if I can drive a DC motor which need 1050 mA as a starting current, using the miniboard. Thanx. Hachemi. (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | How to free up OC2?
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I believe I can disconnect the OC2 pin from the unneeded IR-Xmit function, so I can divert it for my own use. Would that require any trace cutting, or perhaps removal of the LED Xmitter? Or, better yet, is it all a software change? Fred, I know (...) (29 years ago, 28-Mar-96, to lugnet.robotics.handyboard)
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| | Re: pneumatic arms
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(...) Try this site: (URL) may contain some info you need...perhaps? (29 years ago, 27-Mar-96, to lugnet.robotics.handyboard)
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| | Help!
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Hi everyone, I had posted a question or two and some of you had answered me with some helpful info. Unfortunately, I accidentally erased all my messages before I gat a chance to read and save them. So,...if any of you still have any message that was (...) (29 years ago, 27-Mar-96, to lugnet.robotics.handyboard)
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| | Re: icb fixed in IC 3.1
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(...) Guess it comes from trying to earn a living selling software :) At any rate, I had seen the workaround for free IC posted several times in the past week, so I thought I would add rather than repeat information. Sorry for the self-serving (...) (29 years ago, 27-Mar-96, to lugnet.robotics.handyboard)
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| | problems with ICB files
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oh come on, Randy, you're acting too much like a big software company! "Don't worry that that feature is broken, it will be fixed in our new version!"Most of the time, people would rather hear a workaround than be told to upgrade! Regarding the (...) (29 years ago, 26-Mar-96, to lugnet.robotics.handyboard)
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| | .icb files
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(...) I'd recommend moving up to IC 3.1. The current Windows and UNIX beta versions of IC 3.1 should accept .s19 files with any newline convention (CR, LF, CR-LF). (We're fixing that in the Mac IC beta soon). If you do get "illegal line in .s19" in (...) (29 years ago, 26-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Sony IR decoding routine!
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I downloaded the source code sony-ir.asm and assembled with asii_ic.bat and the resulting .icb file worked fine. I jumped the gun asking for help. Thanks any way. Ram. I'm having trouble getting sony-ir.icb to load. Every time I try, I get the (...) (29 years ago, 26-Mar-96, to lugnet.robotics.handyboard)
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| | Re: Sony IR decoding routine!
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I'm having trouble getting sony-ir.icb to load. Every time I try, I get the following error message: FATAL INTERNAL ERROR: ILLEGAL LINE IN .s19 FILE I've re-downloaded and installed both the sony-ir.icb and pcode_hb.s19 files but continure to get (...) (29 years ago, 26-Mar-96, to lugnet.robotics.handyboard)
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