 | | 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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| | Re: Pull Up Resistor
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(...) One more thought. I assume you are using a seperate supply (of some sort) for the Sonar module, so be sure to tie the pullup to the HB's +5V! Rick (26 years ago, 6-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Pull Up Resistor
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(...) I just checked my copy of the Polaroid Sonar Module documentation, and it does in deed state that the module can sink up to 0.1 mA when ECHO is pulled high. It sounds like your module is drawing around 0.064 mA = ((5V - 2V)/47Kohms), so it is (...) (26 years ago, 6-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Pull Up Resistor
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I checked the ECHO signal and found it to be at 2.0V when plugged into TIC3 on the HB. I also applied a pull-up resitor which did send ECHO to 5V when not pinging. However, in both cases, I still had seemingly random positive and negative values (...) (26 years ago, 6-Aug-98, to lugnet.robotics.handyboard)
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| | what is poke and peek command
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Hi, How to understand what is poke( 1009, 0x20) and bit set (1008, 0x20) ? What is 0 x20 and 0x30 ? how to interpret it ? when should I use 0x20 ,0x30, or 0x40 ? what is all these ? Please advice ? I need to understand it so that I can proceed to (...) (26 years ago, 6-Aug-98, to lugnet.robotics.handyboard)
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| | request o schmetic circuit
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HI, Has anybody has the schmetic circuit on the IC of U5 (74HC244 tristate bus driver) which located on the HD ? If have it , please attach to me. Thank you. rgds, phillip chia (26 years ago, 6-Aug-98, to lugnet.robotics.handyboard)
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| | HOW TO UNSUBSCRIBE
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Please, do not send unsubscribe requests to the main Handy Board mailing list. Instead, send them to me, Fred Martin, fredm@media.mit.edu. I am the only person who can remove you from the list. Thank you for your consideration of others on the (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | unsubscribe
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(26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | Re: voltage regulator
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there is probably some other circuit on your board that is drawing too much power. put your finger on the other chips and see if any of them is hot (there shouldn't be any). if necessary, remove all socketed chips to see if you can get the (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | Re: General use PCB
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I too was going to suggest AP having done business with them in the past, however you have to note that they have a 'high density' drilling surcharge. This surcharge is 1 cent for every hole over 24 in 1 sq " of board. Thue "perfboard" (10 x 10 (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | voltage regulator
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The voltage regulator on my board (U13) gets so hot that when i touched it it burned my finger. I am using the recomended 12V 500ma ac adaptor. I have been having problems testing the motor circutry and the red motor lights light up when i turn the (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | Re: General use PCB
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(...) Option #1: How about making some of your own? If you need 60, then the prices from board houses start getting pretty low. Check out these places: (URL) made up a small spreadsheet for expresspcb and apcircuits pricing, and at quantity 60 you (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | digital out
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I am in the need for additional digital outputs. I have read the FAQ and found out that to get 8 more digital outs, I have to connect the 'hc374' clock line to any of the unused output latch selects of the 'hc138'. Has anyone done this? If so, any (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | Pull Up Resistor
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Hi, The polaroid documentation mentions that a 4.7K resistor should be placed between ECHO and Vcc. Should this be done when interfacing to the HB? Thanks, Sheridan (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | Handy Board for Sale!
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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, 5-Aug-98, to lugnet.robotics.handyboard)
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| | General use PCB
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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 inch and 3.5 inch spacing. We have to told that Radio Shack (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Pull Up Resistor
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(...) The sensor connectors on the HB already have pullup resistors on the signal inputs (as I recall they were 47K), so you shouldn't need to add an additional pullup. If you want to make sure, just check the signal connection with a voltmeter to (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | yet another hb for sale
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One Handyboard, from Gleason Research, specifically GRHB-PC, with all cables, power supply, software, LCD, battery, charger board, etc. Get it with two Lego 9 volt gearmotors (they cost me $19 each) and my key for IC 3.2. Used for one small project, (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | troubleshooting
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I am assembling my handyboard and am at the stage where i have completed the motor and analog circuits. When I test hte analog circuit the LCD screen prints"press START to test knob..." when i press start the board beeps and the screen goes blank. (...) (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | CW TECHNOLOGY
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ALL, Do you know if the guy from CW Technology who sells MiniBoard is still doing selling them. I sent him an email, but no reply so far. Thanx. Hachemi (26 years ago, 5-Aug-98, to lugnet.robotics.handyboard)
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| | mouse encoders
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hello, does anyone know how to interface the handyboard with a shaft encoder from a mouse? i am interested in using one out of a microsoft mouse, which uses electrical contacts, instead of an optical sensor. what kind of signal is sent from the (...) (26 years ago, 4-Aug-98, to lugnet.robotics.handyboard)
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| | Re: speed of the board
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From: (...) I assume you are going to need to do trig functions as well? I've written software that functions as a 2-D odometer, and uses encoders on the two wheels, and I had to write sin,cos,atan2 functions. How are you getting rotational (...) (26 years ago, 4-Aug-98, to lugnet.robotics.handyboard)
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| | HANDY BD EXPANSION
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hi, I have gone thru the Handy board expansion schmetic circuit version 3.0 by Mr.Fred Martin whcih updated on the June 14,1998. I have some doubts : 1) What and where is the the Analog pass-through connector (J4) and Motor power pass-through (...) (26 years ago, 4-Aug-98, to lugnet.robotics.handyboard)
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| | FS: HandyBoard
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I have an extra HandyBoard that I assembled and tested. Never used in a project. Includes: Controller Board 2x16 line LCD Nicad Batteries RS-232 Interface/ Charger Board RS-232 Cable Cases for Charger and HB AC Adapter $225 If interested: Mike Davis (...) (26 years ago, 4-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Need Simple IC editor
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Mr. Carmack wrote: <snip> (...) While any text editor will suffice, I highly recommend one called TextPad. It has very powerful features and does an excellent job of formatting source code. It's available as shareware from www.download.com. (Note: (...) (26 years ago, 4-Aug-98, to lugnet.robotics.handyboard)
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| | Where and when to buy a HandyBoard?
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Hi all, I am considering purchasing a handyboard, but Definitly want to get the sensor expansion board when available. 1) Do I need to purchase a specific handyboard in order to get the I/O expansion board to work? 2) Is Gleason Research a good (...) (26 years ago, 4-Aug-98, to lugnet.robotics.handyboard)
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