 | | 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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