 | | Re: General use PCB
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Ed: In a message dated 98-08-05 11:51:18 EDT, you write: << We have been using the Radio Shack, Archer board #276-162A. Specifications: Dimensions 3 inches x 4 inches, with copper lands on one side. 30 holes by 25 holes with mounting holes at 2.5 (...) (26 years ago, 11-Aug-98, to lugnet.robotics.handyboard)
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| | Handy Board Available.
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To Anyone Interested, I have a nearly brand new complete Handy Board for Sale. I used it one week and unfortunately it does not have the capability to do what I want. It is complete with battery installed, serial/charger board, software for IBM, (...) (26 years ago, 11-Aug-98, to lugnet.robotics.handyboard)
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| | mmu
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Hello all, i'm trying to write a small OS, but am confused about something. I don't want to give access to all memory locations for the user, only for the supervisor. Since the 68hc11 doens't have these modes i have to think of something else. A (...) (26 years ago, 11-Aug-98, to lugnet.robotics.handyboard)
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| | ports question (cont)
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... just to follow up on my question: i'm trying to read the photosensors through the analog ports. however, the value returned by analog(i) is always 255, so perhaps i have the sensors hooked wrong. when i read "analog(0);" it always retunes 255, (...) (26 years ago, 10-Aug-98, to lugnet.robotics.handyboard)
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| | ports question
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hi, looking at the sensor diagram at: (URL) see something like this: signal =====||= =||= +5V =====||= ground ====||= on the actual hb, do the three rows of holes along the "bottom" or near edge of the board correspond to the sensor diagram in terms (...) (26 years ago, 10-Aug-98, to lugnet.robotics.handyboard)
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| | problem with digital ports.
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Hi all, I have a problem with my handyboard where it seems that all the digital ports are not responding. While all the other analog and motor ports are fine. Also when I tried to use the program hbtest.c to test the board, it is not working neither (...) (26 years ago, 10-Aug-98, to lugnet.robotics.handyboard)
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| | Some robot pictures
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Hi, I've built several robots over the years and for the RoboExpo in SF I put together a web page with pictures showing them off. Most are R/C conversions but you can view them at (URL) happy to answer questions as well. All except the last one use (...) (26 years ago, 10-Aug-98, to lugnet.robotics.handyboard)
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| | RE: How do I limit current effectively?
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That may be fine, I'm not really very well versed electronically but when doing something similar I had worried that a resistor would reduce the voltage. That might be ok in this situation. Joe Martin (...) (26 years ago, 10-Aug-98, to lugnet.robotics.handyboard)
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| | Re: How do I limit current effectively?
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Why not use a 12ohm 10watt power resistor instead? --Chuck (...) (26 years ago, 10-Aug-98, to lugnet.robotics.handyboard)
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| | Re: mouse
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(...) You might want to try using a "bus" mouse rather than a "serial" mouse (assuming they still make them). They use to be quite common on PC's that had an ISA bus. On a "bus" mouse, all of the encoder outputs are brought out to a board that plugs (...) (26 years ago, 9-Aug-98, to lugnet.robotics.handyboard)
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| | re: mouse
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has anybody try to run a robot based on a mouse to keep trak of his position? what are the settings to observe the string comming out of the mouse?? Yhanks for any info CHEERS henry (26 years ago, 9-Aug-98, to lugnet.robotics.handyboard)
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| | Re: RC Car Robot Base
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Try this from Tamiya, they have a wide range of RC cars/trucks. www.tamiya.com (...) (26 years ago, 9-Aug-98, to lugnet.robotics.handyboard)
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| | RE: How do I limit current effectively?
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National Semiconductor make an "LM317" 3 terminal adjustable regulator which can easily be used as a current limiter. I am not sure if the schematic for this particular application is included with the Data sheets so I'll add it here. Current (...) (26 years ago, 9-Aug-98, to lugnet.robotics.handyboard)
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| | How do I limit current effectively?
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I have 2 large motors that draw about 2 amps. They are powered by a battery that's 6v at 2amp. How can I limit the motors so that they can only draw 1/2 amp????? I know on my first robot (ahh, fine memories of burning resistors), I just made a bank (...) (26 years ago, 9-Aug-98, to lugnet.robotics.handyboard)
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| | RC Car Robot Base
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All: I am trying to find a World Scale RC Car/Truck base for my robot. One of the items I have been looking at was the Thunder King RC Monster Truck from MRC/Tower Hobbies, but they have recently discontinued that part. Does anyone have any (...) (26 years ago, 8-Aug-98, to lugnet.robotics.handyboard)
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| | Re: windows nt and hb
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the advise of turning off the serial port under NT was only to enable using the IC DOS apps. if you are using contemporary software tools, then it is not necessary to do so. just access the serial port according to the recommended manner. fred In (...) (26 years ago, 8-Aug-98, to lugnet.robotics.handyboard)
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| | windows nt and hb
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hi i have a java app which gets input from the serial port via jni (java native interface) and c++. i'd like to get input from 4 photo sensors via the handyboard. however, i read in the FAQ that because i'm running windows nt, i will need to "turn (...) (26 years ago, 8-Aug-98, to lugnet.robotics.handyboard)
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| | Re: what is poke and peek command
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(...) <snip> The poke command writes a byte (eight bits) into memory. The peek command reads a byte from memory. The bit_set command turns on the specified bits of a byte in memory, but leaves the other bits unaffected. An integer constant that (...) (26 years ago, 7-Aug-98, to lugnet.robotics.handyboard)
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| | No More Miniboard Sales to Hobbyists
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I am sorry to announce that, as of 8/1/98, CW Technology will no longer offer Miniboards for sale to individuals, outside the United States, or in lots of less than 5. Due to a lack of time and the resulting poor service, I simply cannot continue to (...) (26 years ago, 7-Aug-98, to lugnet.robotics.handyboard)
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| | Interfacing I2C devices
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Can the HandyBoard interface to I2C devices through it's SPI (or otherwise) port? If so, does anyone have the source code to do so? I am interfacing the National LM4832 chip to it. Thanks in advance. (26 years ago, 7-Aug-98, to lugnet.robotics.handyboard)
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