 | | Re: sonar (fwd)
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(...) My 20 years of navy sonar help me somewhat with active/passive transducers and things in the kilowatt range... :-) but I'm a rank newbie to most of the sonar talked about here. Sounds like Piezo would be very cheap. True? I bought two (...) (28 years ago, 23-Nov-96, to lugnet.robotics.handyboard)
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| | Re: sonar (fwd)
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(...) This is true of the POLAROID Ultrasonic Sensor module, but not necessarily true of all Ultrasonic Sensor modules. It depends on the type of Ultrasonic Transducer the circuit uses. The one I built uses a Piezo-Electric transducer available (...) (28 years ago, 23-Nov-96, to lugnet.robotics.handyboard)
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| | Re: Reflectance sensor
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You can use either. The 180 ohm resistor will make the output LED brighter, which is generally better, unless you make it so bright as to reduce its lifespan. -Fred ---...--- (...) (28 years ago, 22-Nov-96, to lugnet.robotics.handyboard)
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| | Reflectance sensor
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Hi, I'm a little confused. On the Handy Board web page it says to use a 330 ohm resistor, but a coleuge of mine said to use a 180 ohm rest.. Please help. Could it be because I have a different brand of sensor than the one in the diagram??? Thanks in (...) (28 years ago, 21-Nov-96, to lugnet.robotics.handyboard)
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| | (no subject)
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Can somebody help me? I had like to use the SPI of the 68HC11, did anybody already do this? Thanks. (28 years ago, 21-Nov-96, to lugnet.robotics.handyboard)
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| | Voltage regulator gets hot when steering servo
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Hi, I'm working on a project in which I use the handy-board to steer a servo. I noticed that the voltage regulator on my handy-board gets rather hot. You actually burn your fingers on it... So I wondered how much current I can draw from it, without (...) (28 years ago, 21-Nov-96, to lugnet.robotics.handyboard)
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| | Polaroid & Handyboard
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Okay...I hooked up a Polaroid Rannging board to the Handyboard. And something about the supply prevents the echo from being properly detected. If I provide power from a more substantial supply, the echo is detected correctly (I was watching this on (...) (28 years ago, 21-Nov-96, to lugnet.robotics.handyboard)
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| | bus loading
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Hi Scott, (...) Since everything's CMOS, there's no trouble with static loading (CMOS inputs require essentially zero current in static operation). You will, however, be increasing the capacitance on the bus, which slows down the transitions a (...) (28 years ago, 21-Nov-96, to lugnet.robotics.handyboard)
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| | Interface/charge board problem>>part II :)
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Hello again, After several fustrating hours of checking all solder connections, cables, and all that other stuff. I finaly think that my problem is in the MAX232 chip on the charger board. If I remove the chip from it's socket, the handy board will (...) (28 years ago, 21-Nov-96, to lugnet.robotics.handyboard)
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| | HandyBoard Expansion.....
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Hi I'm roughing out a design to add some more(*) IO to my handyboard and have run into a slight problem.... I'm going to have another 4 devices on the data bus, 2 x 74HC574 & 2 x 74HC541. Will this exceed the "fan out" of the cpu ? (I don't have the (...) (28 years ago, 21-Nov-96, to lugnet.robotics.handyboard)
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| | Polaroid Sonar Conector
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Does anyone know where to get a connector that will mate the one provided by Polaroid for the 6500 Ranging Module.? (28 years ago, 20-Nov-96, to lugnet.robotics.handyboard)
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| | RE: sonar (fwd)
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(28 years ago, 20-Nov-96, to lugnet.robotics.handyboard)
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| | Re: Integer -> float
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Oops! That should be: f=(float)i; That's what happens when you stay up too late. :-) - Prabal (...) (28 years ago, 20-Nov-96, to lugnet.robotics.handyboard)
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| | Re: Integer -> float
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(...) Are you sure about this? In your example, i is the float and f the integer. Silvain (28 years ago, 20-Nov-96, to lugnet.robotics.handyboard)
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| | Re: Digitals outputs and SPI
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(...) Go to the FAQ. -Fred (28 years ago, 20-Nov-96, to lugnet.robotics.handyboard)
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| | Digitals outputs and SPI
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Hi, I read something about controlling the SPI bus and about adding digital outputs, but I can't find it anymore. Can anybody help me? Thanks. Regards. -David (28 years ago, 20-Nov-96, to lugnet.robotics.handyboard)
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| | Re: Integer -> float
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Hi Micah, To convert an int to a float, simply type: i=(float)f; where i is the integer and f is a float. - Prabal (...) (28 years ago, 20-Nov-96, to lugnet.robotics.handyboard)
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| | Integer -> float
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I know I have seen the answer to this somewhere before, but I can't remember how to convert an integer to a float. Micah D. Krider kmicah@uwf-uf.ee.uwf.edu (28 years ago, 20-Nov-96, to lugnet.robotics.handyboard)
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| | RE: IR communication (fwd)
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There will be a lot of IR radiation bouncing around and that can be problematic. Another IR detection technique is to use a camcorder, they are sensitive to IR light. Low light CCD cameras are even better. If you want to hook up 4 IR xmitters from a (...) (28 years ago, 20-Nov-96, to lugnet.robotics.handyboard)
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| | Re: Polaroid Sonar
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Yeah, mine too! :D But, it works! btw, what kind of message was that? (...) (28 years ago, 20-Nov-96, to lugnet.robotics.handyboard)
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| | IR communication (fwd)
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Can someone please attempt to help me out.. second posting??? I want to get five handyboards to talk to each other using infrared transmission... I use infrared transmitter/receiver reflectance sensors for other things... 1) What parts (I need (...) (28 years ago, 20-Nov-96, to lugnet.robotics.handyboard)
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| | Battery Care
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Hi, What's the best way to care for the NiCd pack of the Handyboard? I understand that NiCd's undergo the "memory effect". Does this mean that you should always use your Handyboard untill the RED LED light comes on...and then recharge it? Is it OK (...) (28 years ago, 20-Nov-96, to lugnet.robotics.handyboard)
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| | Polaroid Sonar
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Hi, I'm powering my Ranging Module with the 9.6V unregulated motor power header. Does anyone know if there is a danger in doing so? (28 years ago, 19-Nov-96, to lugnet.robotics.handyboard)
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| | Re: mode select pins
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(...) The HB runs in special test mode to facilitate control of the LCD screen. Read the Appendix B information in the Tech Docs section for more info. -Fred (28 years ago, 19-Nov-96, to lugnet.robotics.handyboard)
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| | Uh oh, serial questions
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I am trying to get a handyboard and a miniboard to talk to each other over the serial ports. I am using Randy Sargent's notes, and that all seems fine. Some times, quite randomly, the handyboard "locks up". The heart beat stops, and the board stops (...) (28 years ago, 19-Nov-96, to lugnet.robotics.handyboard)
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| | mode select pins
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Can somebody explain to me why the Handyboard MODB pin is hardwired to zero when normal expanded mode requires it to be set high. My book says MODA and MODB should be zero for special bootstrap mode and both high for normal expanded. According to (...) (28 years ago, 19-Nov-96, to lugnet.robotics.handyboard)
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| | Bug
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(...) Oops. Anytime you find a "fatal internal error", you've found a bug in IC (even if your code happens to be wrong, IC should _never_ give a fatal internal error). Please mail us a copy of the code that causes IC to barf, and we'll fix the bug (...) (28 years ago, 19-Nov-96, to lugnet.robotics.handyboard)
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| | Error Message
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I am using the IC for windows 95 that I have downloaded from the newtonlabs website and when I tried to download one particular IC file that I wrote, I got the error Fatal internal error: Illegal type -1610612735 in type__name It is probably not (...) (28 years ago, 19-Nov-96, to lugnet.robotics.handyboard)
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| | Re:
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I have similar problems often when my board is low on battery... could it be that your battery is low low... And I turn the board on before hooking it up to the serial board. (...) Sincerely, Yoni Garbourg << To succeed, Atificial Intelligence needs (...) (28 years ago, 19-Nov-96, to lugnet.robotics.handyboard)
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| | (no subject)
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this could also be a problem with the cable betw the interface/charger and the host computer. does the green led on the interface go on when plugged into the host CPU? if not, this is indicative of such a cable probl. however, the pwr light on the (...) (28 years ago, 19-Nov-96, to lugnet.robotics.handyboard)
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| | Re:
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(...) and (...) I've noticed that plugging in or unplugging the serial/charger cable confuses the board. Try plugging it in first, then putting it into DL mode. If you want to unplug it, turn it off first, then power it back on (e.g, after you've (...) (28 years ago, 19-Nov-96, to lugnet.robotics.handyboard)
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| | (no subject)
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Hey guys, My handy board has worked great so far! I've hooked it up with bumpers light detectors, and infared proximity detectors. But unfortunatly, last time I tried to load Pcode, my handy would not go into bootstrap download mode. After screwing (...) (28 years ago, 19-Nov-96, to lugnet.robotics.handyboard)
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| | Digital Compass
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Dose anyone know how to hook up the Vector 2X Digital Compass to the handyboard. I know to use the SPI, but what else. Any info would be great. Illegitmi non carborundum -scoooty- (28 years ago, 18-Nov-96, to lugnet.robotics.handyboard)
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| | Re: Handyboard in the U.K.
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(...) Im not sure if Radio Shack is in the U.K. or not (I doubt it) but they sell ultrasonic tape measures for about $29. Possibly you could order a catalog from them. Alternately there were several suggestions for building your own in the group (...) (28 years ago, 18-Nov-96, to lugnet.robotics.handyboard)
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| | RE: sonar (fwd)
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(...) This is correct, but it isn't too expensive. Scott Edwards has a PIC that will do all of the computation for you. I built a cheesy ultrasonic sensor using a Ramsey Electronics Tone Detector and a modified Rainbow electronics IR-3 board. (total (...) (28 years ago, 18-Nov-96, to lugnet.robotics.handyboard)
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| | Handyboard in the U.K.
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I'm just getting started into robotics and have spent the last weekend going over the archived mailing list (big isn't it?!). It has certainly whetted my appetite. I've lashed together a rudimentary 6811 board and have since discovered the (...) (28 years ago, 18-Nov-96, to lugnet.robotics.handyboard)
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| | Ok, the Ultrasonic Docs are up http://www.vnet.net/wizorg/wizorg.html
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Howdy all, I've gone ahead and put up the Ultrasonic Ranging System documentation and schematics on my web page: (URL) Hope it helps someone! John (28 years ago, 18-Nov-96, to lugnet.robotics.handyboard)
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| | Re: sonar (fwd)
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Just to add a basic newbie note on receiver blanking that will have to be designed in if you build it yourself. A transmit pulse is a very powerful (relatively speaking) pulse. For example, the Polaroid transducer, about the size of a silver dollar, (...) (28 years ago, 18-Nov-96, to lugnet.robotics.handyboard)
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| | Re: Used Handy Boards
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(...) Can't offer much wisdom at this time since we are at the same place as you. Decided on Handyboard, saw three different suppliers in the HB stuff at MIT, and will decide this week which to buy. We're using Polaroid sonar, IR, and bumper (...) (28 years ago, 18-Nov-96, to lugnet.robotics.handyboard)
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| | Re: Strange Problem???
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(...) you don't have to do it manually? I have one. it's attached, and was made by my friend. It stands for IBM-To-UNIX. I have also it's companion, UNIX-To-IBM ;) cya! (28 years ago, 18-Nov-96, to lugnet.robotics.handyboard)
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