 | | Re: digital ins
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(...) ... (...) Chuck is right about the correct solutions. For a less correct solution, you can take advantage of the fact that HC parts (including the 6811) have built in voltage limiters that are only good for fractional milliamps (in some cases (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | Re: digital ins
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(...) 5.12 volts (...) Yes. (...) 5.12 volts max, 0 volts minimum (...) The correct solution to your problem is to use an op-amp signal conditioner, possibly feeding into a schmidt trigger if you need some hysteresis. (sp?) You can also rig a zener (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | Adding to the data bus
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After looking at the addressing scheme on the handyboard and determining it is possible to add a number of more outputs and inputs by extending the data lines to another board and using the free lines comming from the 74hc138. I built a robot arm (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | digital ins
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Hi all, At what voltage on the digital ins does one risk damaging the HB? I want to feed an amplified signal to the digital ins on my HB to exaggerate the response of a photosensor in the 2-3V range of its operation. Unfortunately, this means that (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | IC memory usage
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(...) IC 3.1's pcode is structured the same way. -- Randy ---...--- Randy Sargent Newton Research Labs Senior Design Engineer Robotic Systems and Software rsargent@newtonlabs.com (URL) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | Re: free memory
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(...) Hi, I've just been working on the p-code interpreter. I've been working with the Version 2.861, not the HandyBoard version. But I did a "diff" and there doesn't seem to be much difference. At any rate, here's the map I made for Version 2.861: (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | Re: free memory
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I don't remember exactly, but the memory map for IC is something like: pcode itself: 8K used user compiled code + global program data: 16K available user process stacks and runtime locals: 8K available ---...--- 32K total memory this is ball park. (...) (27 years ago, 26-Aug-97, to lugnet.robotics.handyboard)
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| | (no subject)
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No, there is not. We built printf to the LCD as a special case. Sorry! -Fred In your message you said: (...) (27 years ago, 25-Aug-97, to lugnet.robotics.handyboard)
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| | (no subject)
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Hello, Does anyone know how I can get a sprintf function with IC ? Since there is a printf function, the code must be somewhere in the system. (Unfortunately, the printf outputs only to the LCD !). Thanks ! Laurent VARTANIAN. (27 years ago, 25-Aug-97, to lugnet.robotics.handyboard)
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| | free memory
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Ther is a way to tell how much free RAM I have on the HB with IC? or how much memory does pcode take? regards stefano nardone || || tel.: +39 81 7142222 (work) | fax: +39 81 645130 || e-mail: stefanon@promos.it | stefanon@synapsis.it || web: (URL) (27 years ago, 25-Aug-97, to lugnet.robotics.handyboard)
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| | Re: more help, please!
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It all depends on how much you want to spend and how you want to drive them. 1) The piggy back method works, but is difficult to manage mechanically and the chips weren't designed for it. (Generally it works ok however) 2) Using a separate H-bridge (...) (27 years ago, 24-Aug-97, to lugnet.robotics.handyboard)
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| | Re: DIP switches
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you can use dip switches in the standard digital in ports if you either (a) solder them to male header first, or (b) insert them in a wire-wrap socket and then insert the wire-wrap socket pins into the HB sensor ports. both of these methods get (...) (27 years ago, 24-Aug-97, to lugnet.robotics.handyboard)
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| | Re: connecting (LEGO) motors
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all 9v LEGO motors are fine with the Handy Board. -Fred In your message you said: (...) (27 years ago, 24-Aug-97, to lugnet.robotics.handyboard)
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| | Re: Books on bots
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A really good reference on the Motorola MC68HC11 family and microcontrollers in general is "Design with Microcontrollers" by John Peatman (ISBN 0-07-049238-7). It provides an excellent overview of the HC11 and covers the hardware and software (...) (27 years ago, 23-Aug-97, to lugnet.robotics.handyboard)
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| | more help, please!
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hello Ok, i have a question. First of all, thanks to all who helped me with my h-bridge problems. You know who you are:thanx! ok, here is my question: i have 2 motors that draw 2amps apiece. I also have a 6v 7amp lead battery. Which of these options (...) (27 years ago, 23-Aug-97, to lugnet.robotics.handyboard)
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| | DIP switch in headers
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(...) Actually, this sensor connector layout was my idea back for the Rev 2 6.270 board, and, yes, I did have both keying, and, secondarily, dip switches in mind when I designed it. However, plugging in dip switches turned out to be a bad idea, (...) (27 years ago, 23-Aug-97, to lugnet.robotics.handyboard)
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| | Re: Handyboard Expansion Board
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(...) Well if you are not using it, you could use the trim pot to drive a menu. cya! .---...---.. | Remi Desrosiers | "My Youth in Arcadia" | harlock@videotron.ca . . (27 years ago, 22-Aug-97, to lugnet.robotics.handyboard)
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| | Re: Handyboard Expansion Board
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Actually, unless Fred has changed the way the sensor connectors work he was quite clever in that the spacing of the I/O connectors is exactly dip switch width. Basically you can plug in a DIP switch into the I/O header and get as many switches as (...) (27 years ago, 22-Aug-97, to lugnet.robotics.handyboard)
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| | Handyboard Expansion Board
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Hi folks, I know it's probably a bit too late, but couldn't you somehow add some DIP-switches to the expansion board, like the ones on the 6.270 ? This would be very nice for quickly changing the way a program works, without hanving to recompile it. (...) (27 years ago, 22-Aug-97, to lugnet.robotics.handyboard)
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| | connecting (LEGO) motors
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Hoi, I am still puzzled about connecting motors to the handyboard. I have seen plenty of motors wich draw less current then 600 mA. But still they have a couple of Amps stall current. Are the moter drivers chips protected for this ? Are all LEGO (...) (27 years ago, 22-Aug-97, to lugnet.robotics.handyboard)
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