 | | 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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