 | | Re: Expansion interface status
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(...) To Fred and others, I've been thinking about this off and on for over a year now, and since I now have parts I'll finally get my HBs into something more than just board status. Robots eat I/O pins for lunch. Sensors eat input pins and (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | Re: Expansion interface status
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Do you think Scott Edward would consider selling just the processor? The expansion board could be made to accept Scott's processor or an unprogrammed one if someone had a different application. Which processor does he use anyway? The other thing (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | Re: 6 servos and RS232...
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(...) From memory of my designer engineer days, the EIA RS232 specification quotes something along the lines of: logical level RS-232 level zero or idle -3V to +15V one +3V to -15V The spec gave maximum slew rates for signals and such specifics such (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | RE: 6 servos
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You can hook it directly to a PC serial port. Here is the note on it: 1.Controls eight hobby (R/C) servos. 2.Opto input takes RS-232, -422,-485, CMOS and TTL. 3.Baud rate configurable for 2400 or 9600. 4.Addressable up to 32 controllers on one port. (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | Re: 6 servos
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(...) Just to make sure it wasn't a typo...so, the TTL level is "ative low"? Also. Does the Scott Edwards board have the ability to be connected to a computer? or do you need a "TTL to RS232 converter"? (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | Re: Expansion interface status
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(...) Build a 68360 in the expander board, that'll get ethernet, and multiple SCI ports. All the IO anyone should ever need. :-). (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | RE: Expansion interface status
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While I welcome the small kits, they introduce interface issues for beginners, especially if there are multiple kits attached simultaneously - seems like this is a problem the expansion board should be solving rather than causing. The value I am (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | FW: 6 servos
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RS232 is +12 and -12, but most serial ports can work correctly even if the signal is 3 to 5v. I regularly use 3 to 5v level serial signals. If you need to convert low voltage serial to RS232 specs, you can use a chip like Maxim's 232 - see (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | Re: 6 servos
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(...) There are two types of serial voltages: TTL level and RS-232 level. The HB's serial interface board converts from TTL to RS-232 for communicating with the host computer. The Scott Edwards board accepts TTL levels, so an HB pin can drive it (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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| | Re: 6 servos
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(...) Are the digital outputs at 5v high? I think you mentioned on the HB homepage about the serial interface converting RS232 levels at +12 and -12v to TTL levels (5v). I'm not that familiar with the nitty gritty of RS232 so this kinda puzzles me. (...) (28 years ago, 22-May-96, to lugnet.robotics.handyboard)
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