 | | I2C output
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Does anyone have any information on how to use the HB to output I2C signals thru it's SPI port? I'm interfacing it to the National LM4832 audio controller IC. Thanks! (26 years ago, 14-Aug-98, to lugnet.robotics.handyboard)
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| | Re: PID implementation
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(...) It seems that you have a feedback system here. How does battery voltage and surface resistance add error to your system when you have a feedback loop to correct your error signal? (...) No braking? We solved that problem by effecting reverse (...) (26 years ago, 13-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Some robot pictures
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Chuck, Thank your for the pictures. the robots are very cool. I was wondering what was the cost for each robot? I am trying to get items together to builb my own but it is a slow going task due to money. I can't wait to see your next bot. Thanks (...) (26 years ago, 13-Aug-98, to lugnet.robotics.handyboard)
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| | Re: intel hex file
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Hello brian, I use a gcc compiler for the 68hc11F1. I do have an assembler that generates good intel hex files, and the other is used with the gcc compiler. It was my mistake in not looking correctly to the files, actually it are the same kind of (...) (26 years ago, 13-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Stepper motors
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Hello mario, Its actually very simple, use an uln2803, connect it to an not used port (i.e. porta in my case), connect the coil wires to the appropriate pins, and the supply lines to the stepper vcc. now you can write values to the port. you should (...) (26 years ago, 13-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Some robot pictures
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Thanks for the Kudos, Actually the timeline is more like "Clyde" (not pictured), "Robotank" (Sherman chassis with a miniboard), "RobotTankII" (Sherman Chassis with 6.270 board), "Comet" (not pictured, R/C conversion w/Miniboard), "Ghost" (not (...) (26 years ago, 12-Aug-98, to lugnet.robotics.handyboard)
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| | Stepper motors
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Hello, Does anyone have information on how to run a stepper motor using the Handy Board? Any information you can provide would be appreciated. Mario Garcia (26 years ago, 12-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Some robot pictures
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Cool robots, Chuck! I was wondering it when they were created. It looks like the top one was created first and the last is the bottom one. Is that so? ---...--- ericson mar Master of Engineering Candidate Project: Mobile Robotics mar@cooper.edu (...) (26 years ago, 12-Aug-98, to lugnet.robotics.handyboard)
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| | Re: serial library for C++
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Check out this site. It works well. The only problem I had was timing issues when trying to read and write to the port too quickly. (URL) Message----- From: Mark Wallace <mawalla3@vt.edu> To: Handyboard@media.mit.edu <Handyboard@media.mit.edu> (...) (26 years ago, 12-Aug-98, to lugnet.robotics.handyboard)
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| | serial library for C++
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Hello, I have a handy board with poloroid transducers and I am trying use the results of my distance measurments in a C++ program on the computer. I have found programs on the handyboard web page that should alow the handyboard to transmit (...) (26 years ago, 12-Aug-98, to lugnet.robotics.handyboard)
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| | PID implementation
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Problem: I have built a small robot with differential drive using 3+ACI- diam whee ls turning at 66 RPM +AEA- full power PWM no load. Each wheel has a 16 pulses per rev. reflective type shaft encoder. the robot is controlled by the Handy Board (...) (26 years ago, 12-Aug-98, to lugnet.robotics.handyboard)
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| | intel hex file
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Hello all, Does anybody has information of the intel hex file. I do understand the intel hex file (xxx.hex) that is generated by the asm programs, but i use a new assembler, (with the gcc compiler) and it generates different intel hex file (...) (26 years ago, 12-Aug-98, to lugnet.robotics.handyboard)
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| | PCB
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fthompson wrote: "Some time ago Karl Lundt included in his Amateur Robotics column a short description of a new Printed Circuit Fabrication material where you ran the copper clad through a laser printer (to print directly onto the copper rather than (...) (26 years ago, 11-Aug-98, to lugnet.robotics.handyboard)
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| | Re: mmu
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It's not impossible. The easiest way is to use the same technique as Java (or IC) and write an embedded interpreter that executes code for a "psuedo" machine. The resulting machine can have arbitrarily strict access restrictions between tasks. You (...) (26 years ago, 11-Aug-98, to lugnet.robotics.handyboard)
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| | PCB Fabrication material.
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Some time ago Karl Lundt included in his Amateur Robotics column a short description of a new Printed Circuit Fabrication material where you ran the copper clad through a laser printer (to print directly onto the copper rather than using iron on (...) (26 years ago, 11-Aug-98, to lugnet.robotics.handyboard)
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| | 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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| | 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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