 | | Difference between designer and OEM Polariod kit
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Hi, What's the difference between the Designer and OEM polaroid kits. Which one do I need to hook up the polaroid sensors to the HB? Thanks (27 years ago, 10-Sep-98, to lugnet.robotics.handyboard)
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| | Questions for Fred
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I guess I should have learned by now, to investigate more before jumping out and asking. I examined the two versions of the lib_hb.c the difference in the analog is the absence of the following code in the smooth pwm code: int _raw_analog(int port) (...) (27 years ago, 10-Sep-98, to lugnet.robotics.handyboard)
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| | Questions for Fred
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Fred, or who every can answer this. I have implemented the smooth PWM routines and are very happy with them. I notice now that there is a fix for the analog sensor reading bug. One file that is replaced is the lib_hb.c file, which was also the file (...) (27 years ago, 10-Sep-98, to lugnet.robotics.handyboard)
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| | Re: bootstrap mode in assembling the HB
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yes, RP4 is four isolated resistors, and this being part of the serial line circuit, definitely explains your problem if you are using the common-terminal style. you can just install four 1K resistors if you don't have the correct r-pack handy. fred (...) (27 years ago, 9-Sep-98, to lugnet.robotics.handyboard)
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| | bootstrap mode in assembling the HB
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hi At present I am up to section 4.4, "serial line and stop switch". I have installed all the components as per the section but when testing by applying power and holding down the stop switch, the HB will not go into bootstrap mode. I have not (...) (27 years ago, 9-Sep-98, to lugnet.robotics.handyboard)
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| | Fw: Current Rating use on HB
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(...) that (...) (27 years ago, 8-Sep-98, to lugnet.robotics.handyboard)
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| | encoder use in stepper motor
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hi, How can i use my self build encoder to locate the position when my robot reach a position ? Is it suitable to use a self build encoder together with the stepper motor? The self build encoder consists a photoelectric reflector sensor mounted (...) (27 years ago, 8-Sep-98, to lugnet.robotics.handyboard)
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| | Re: IC dip 120 or Ic dip 210
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(...) (27 years ago, 8-Sep-98, to lugnet.robotics.handyboard)
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| | Current Rating use on HB
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Hi, What is the current rating allow to be use on the HD if currently I am using a stepper motor of rating 4.5V and current 3Amp ? Is it all right directly plug it into the HB? How should I increase the acceptable current rating on the HB? How (...) (27 years ago, 8-Sep-98, to lugnet.robotics.handyboard)
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| | IC dip 120 or Ic dip 210
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Hi, Is there anybody came across such IC Dip 210 or Dip 120 ? rgds, chia (27 years ago, 8-Sep-98, to lugnet.robotics.handyboard)
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| | using interupts from IC
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I want to drive 3 stepper motors form a handy board. I have the code running now as a dll under windows. What Im trying to gain from the HB is using interupts, so I can remain in connntact with the control while the steps time out- right now I just (...) (27 years ago, 8-Sep-98, to lugnet.robotics.handyboard)
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| | Re: Serial Communication with HP48 calculator
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(...) not that i am aware of. you could connect to the HB's phone jack as long as you don't have to talk to interactive c and your calc at the same time. see the FAQ serial answer. (...) the SPI is for high speed SYNCHRONOUS comms (data and clock (...) (27 years ago, 7-Sep-98, to lugnet.robotics.handyboard)
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| | Bootstrap download mode
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Hi I have been trying to get the HB into bootstrap mode without much success. Following the instructions in the manual, I held down the STOP button while turning on the HB. The red and green LEDs were supposed to turn on for a short period of time (...) (27 years ago, 5-Sep-98, to lugnet.robotics.handyboard)
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| | Re: [LCD screen]
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Like this: printf("\n"); printf("\n"); That's all there is to it. (...) (27 years ago, 4-Sep-98, to lugnet.robotics.handyboard)
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| | Re: Bootstrap download mode
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see if you can get it to go into download mode when you don't have the phone cable plugged in. if this works, then you have some kind of probl with your serial connection. make sure you have a normal modem cable, and a telephone style RJ11 cable (...) (27 years ago, 4-Sep-98, to lugnet.robotics.handyboard)
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| | [LCD screen]
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Hello all, I know it's a pretty stupid question, but anyone knows how am i supposed to clear(in Interactive C) the LCD screen of the HandyBoard ? I've tried printf("\n"); printf(" "); but it doesn't work. Thank you very much. Marcelo Manjon (27 years ago, 4-Sep-98, to lugnet.robotics.handyboard)
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| | Re: Steppr motor pulse problem
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Phillip: In the process I was referring to, you do not use the Handy board, driver or anything to determine the step sequence. You only use the motor and a battery (after you finish with the Ohm meter). The idea is to learn what the motor is (...) (27 years ago, 4-Sep-98, to lugnet.robotics.handyboard)
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| | expansion board
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Hi, I was wondering how the expansion board is doing? Is out of testing? Any major glitches? Ilya (27 years ago, 4-Sep-98, to lugnet.robotics.handyboard)
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| | HB web servers down
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hi all, we had a filesystem upgrade last night and both of the Handy Board web servers (el.www.etc and lcs.www.etc) are presently down. Hope to have at least one of them running later today. Fred (27 years ago, 2-Sep-98, to lugnet.robotics.handyboard)
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| | HandyBoard for Sale
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If you are thinking about buying one... I have an extra HandyBoard controller board that I assembled and tested. Never used in a project. 68HC811E1 (2K EEPROM) 32K RAM 2 x 16 LCD 9 Digital Inputs 7 Analog Outputs IR Interface Nicad Batteries RS-232 (...) (27 years ago, 30-Aug-98, to lugnet.robotics.handyboard)
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| | Re: [Interactive C features]
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[Randy Sargent] spake unto the ether: (...) Sigh. I can't forsee our Autonomous Robotics course buying 15 copies of IC 3.x or greater until it supports case/switch. It's the only feature that our students using freeware 2.81 really complain that (...) (27 years ago, 28-Aug-98, to lugnet.robotics.handyboard)
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| | Resend: problems with main()
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I posted earlier in the week about having a problem with the SRAM. I have determined that there is not a problem with the SRAM on the handyboard. The problem is that "main()" is not executing on reset like it is supposed to. The program that I am (...) (27 years ago, 27-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Analogue sonar design.
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Hi, There is another way to get the Polaroid sonar unit. And that is to find an old Polaroid camera. That's the hardest part but allot of people bought them and are not using them any more. When you open it up there will be the Sonar board complete (...) (27 years ago, 27-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Steppr motor pulse problem
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Phillip and others, To this excellent exposition I would change only one thing: (...) Change this to : "Write this pattern down neatly IN YOUR ROBOTICS NOTEBOOK." One of my professors at school noted that the most important thing he learned in (...) (27 years ago, 27-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Steppr motor pulse problem
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Phillip First step is to put a piece of tape on the shaft so that you can clearly see the shaft turn. Next determine what kind of motor you have (you have probably already done this). Get an ohm meter and determine which wires are connected to (...) (27 years ago, 27-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Steppr motor pulse problem
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Hi Philip, are you shure, you have the right pins from the stepper to the outgoing pins from your chip. Have your stepper 4,5 or 6 cables? If you exchange the cables, your stepper motor only do some vibrations or doing nothing. The easiest way to (...) (27 years ago, 27-Aug-98, to lugnet.robotics.handyboard)
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| | Re: [Interactive C features]
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You can also upgrade to IC 3.1/3.2. Among the improvements include support for multidimensional arrays. -- Randy ---...--- (...) (27 years ago, 27-Aug-98, to lugnet.robotics.handyboard)
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| | Re: [Interactive C features]
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(...) You could use a one dimensional array of length width*height such that: cellMazeWhatever[x][y] is turned into cellMazeWhatever[(x-1)*width+y] (27 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| |
| | [Interactive C features]
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Hello All, my name is Marcelo Manjon and i am 5th year graduate student of Mechatronics Engineering at Politechnic School of Sao Paulo University. Turns out that this year i'll be developing a Micromouse Robot using the MIT Handy Board. I have (...) (27 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Analogue sonar design.
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Jeroen van der Vegt, Let me suggest some articles. First "Sonars on the Cheap" by Keith Payea page 20 of the Fall 1995 issue of The Robotics Practitioner. This looks lie about a $30 design. Second "An Experimenter's Cheap Robotic Sonar System" by (...) (27 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | HB's analog inputs
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does anyone know if the handy board's analog inputs can accept analog current output(4-20mA) from a photo-electric distance sensor? (e.g. the sensor might return 4mA if the object is 1 ft away and 15mA if it's 3 ft away) or can it only accept (...) (27 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| |
| | problems with main()
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|
I posted earlier in the week about having a problem with the SRAM. I have determined that there is not a problem with the SRAM on the handyboard. The problem is that "main()" is not executing on reset like it is supposed to. The program that I am (...) (27 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Re: HB's analog inputs
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(...) Edmund, Typically the solution is to pass the 4-20 mA through a 250 ohm resistor and measure the voltage across that resistor. As long as your A/D input impedance is high, it can be ignored. A resistor is essentially a current to voltage (...) (27 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Steppr motor pulse problem
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Hi, I've encounter some problem on using the stepper motor with my self-built driver. I am not using the driver in the HB. I have to build out a driver. The driver chip I use is L298 and logic gate chip is L297 or 374( this chip also use in HB) . (...) (27 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Digital Outputs
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I have discovered that I can use PA6 as a digital output and am wondering if the same applies to PA3 if I do not require a piezo buzzer? Thank You Joe Martin joema@mpx.com.au (27 years ago, 26-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Detector
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Mekatronics also sell the GPU58 series detectors -----Original Message----- From: Rick Moll <rickmoll@mvp.net> To: Victor Ruiz <ruizvic@mx1.ibm.com> Cc: handyboard@media.mit.edu <handyboard@media.mit.edu>; Rick Moll <rickmoll@mvp.net> Date: Tuesday, (...) (27 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: interfacing V2X compass
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(...) I ended up doing the same thing. I appreciate hearing that someone else had thesame problem, and used the same solution. It sure is frustrating that you can't trust the documentation that came with the compass; if you need to reset the thing (...) (27 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: interfacing V2X compass
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Rick, I had the same problem. Also the compass would occassionally lock up and require a reset. I tied the reset pin to a digital out and added a routine to take all the necessary pins high and then cycle the reset pin. I reset on initialization and (...) (27 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Detector
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(...) The most common metal can IR detectors are made by Sharp. The older ones I have are marked GP1U5X2 (with pins coming out the back of the can), but the newer ones I have are part number GP1U58Y (and have pins coming out of the bottom of the (...) (27 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | HB 4 sale
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I have an assembled Handyboard and MIT's 6.270 board for sale. Both boards work great. 125 ea or 200 for both. Reply to this email (27 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Analogue sonar design.
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|
Hi all, I'm trying to build a sonar circuit and connect it to my HandyBoard. I know Polaroid makes one, but I have no idea where to get it for little in Europe. I try to keep the interface as simple as possible, and I'll probably be using three (...) (27 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Detector
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Hi Rick; I apreciated your response too much. Do you have the part number for the infrared detector? Victor G. Ruiz Aranda ruizvic@mx1.ibm.com T/L 877-7306. Ph Number 011-523-669-7306 GPL Guadalajara, Jal. Mexico. rickmoll@mvp.net on 08/25/98 (...) (27 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Detector
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(...) You might want to consider just using the more commonly available metal can IR detectors. I think they are even available at Radio Shack, and I think DigiKey sells them as well. The pinouts are *not* the same, so you'll need to work out some (...) (27 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Infrared Detector
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Hi to all, I would like to know if somebody knows where can I found the address of an electronic distributor that sell individual 'infrared detector' IS1U60 from SHARP, I was looking in many electronic sites and the minimun is 50 pcs. I only need 2 (...) (27 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | No subject given
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Hay guys, Could some one tell me where can I buy a unassembled HB. Is it hard to assembled a HB? Thanks, -anton (27 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | Infrared Detector
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|
Hi to all, I would like to know if somebody knows where can I found the address of an electronic distributor that sell individual 'infrared detector' IS1U60 from SHARP, I was looking in many electronic sites and the minimun is 50 pcs. I only need 2 (...) (27 years ago, 25-Aug-98, to lugnet.robotics.handyboard)
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| | polaroid
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LS. I read something about the sonarboard. Bill James did write to Jim about Jim finding a solution for some board. I am interested in any solution to make my polaroid board work. It doesn't even make a sound. It doesn't work at all.....?? I wonder (...) (27 years ago, 24-Aug-98, to lugnet.robotics.handyboard)
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| | Re: 32K static CMOS RAM bad?
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|
(...) It sounds like the SRAM is just fine. Is your battery charged up??? If so, you may want to check out the battery backup circuit for the SRAM. In the HB assembly instructions there is a test to verify that the SRAM has voltage to it even when (...) (27 years ago, 24-Aug-98, to lugnet.robotics.handyboard)
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| | Sonar board?
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Jim, Congrats on getting the board to ping and read. If you believe you circuit is good, I would be willing to buy a board and etch some at the RBNO tommorow. That is if you have it laid out. I would give you a board for your hard work. Tell me and (...) (27 years ago, 24-Aug-98, to lugnet.robotics.handyboard)
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| | 32K static CMOS RAM bad?
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|
I am having some problems with my handyboard and before going out and buying a new chip, I thought I might get some confirmation. The board works okay, but no longer stores the program. I can download the pcode and it stays when the board is powered (...) (27 years ago, 24-Aug-98, to lugnet.robotics.handyboard)
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| | notice of downtime
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dear all, we are moving computers within the building next week, and the el.www web server will be down beginning Monday for a while -- hopefully, just a day or two. in the meantime, please use the old URL to access the Handy Board web site: (URL) (...) (27 years ago, 22-Aug-98, to lugnet.robotics.handyboard)
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| |
| | Is the IO expansion board for sale yet?
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|
Hi All, I'm new to the handyboard and this newsgroup. So, I'm not sure if this question has been answered yet. But, is the I/O Expansion board out of beta yet? I haven't purchased a Handyboard yet, but was waiting until I finished a few projects and (...) (27 years ago, 20-Aug-98, to lugnet.robotics.handyboard)
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| | Re: Is there a documentation on the memory map
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|
(...) Please see the FAQ; specifically: (URL) Can the handy-board be program using generic assembly language og 6811 ? see information on the Software/Contributed page: (URL) (27 years ago, 20-Aug-98, to lugnet.robotics.handyboard)
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| | Is there a documentation on the memory map
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|
Where can I find documents on the handy board memory map ? Can the handy-board be program using generic assembly language og 6811 ? ===...=== Osaka Densi Block 1003 Toa Payoh Industrial Park #04-1521, Singapore 319075 Tel : (65) 356-2848 Fax : (65) (...) (27 years ago, 20-Aug-98, to lugnet.robotics.handyboard)
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| | Where to find the clock signal
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Hello, I would like to link a clock signal to an encoder counter.Could someone tell me if it is possible to use the 2 MHz clock signal of the HB.If yes, where can I easily pick it on the HB. If not, what kind of independant clock circuit would you (...) (27 years ago, 19-Aug-98, to lugnet.robotics.handyboard)
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| | A simple question.....
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|
hello to all can someone please tell me if it is possible to connect external motor drivers (e.g a stepper motor driver) to the handy-board? if so, how can one go about doing it? i desperately need help as the dateline for my project is drawing (...) (27 years ago, 19-Aug-98, to lugnet.robotics.handyboard)
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| | re: A simple question.....
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|
I connected a high powered hbridge board to mine. I just used remove the existing hbridge chip and connect the inputs to the chip to the hbridge board made by Wirz. It works great. Bill James | work: 972.480.2306 Product Test Specialist | Pager: (...) (27 years ago, 18-Aug-98, to lugnet.robotics.handyboard)
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| |
| | Re: source for Futaba servo motors?
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[Rick Moll] spake unto the ether: (...) I called them this morning and ordered 6 Futaba S148 servos; they had a 3-pack for <$40; with shipping, order total was $85.93. Nomenclature note: I confused the guy on the phone by asking about "servo (...) (27 years ago, 18-Aug-98, to lugnet.robotics.handyboard)
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| | Re: source for Futaba servo motors?
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(...) I've been buying lots and lots of servos from TowerHobbies (1-800-637-4989) and modifying them for our local robot group here in St. Louis. I've always received good customer service from them. The best prices on servos are their store brand (...) (27 years ago, 17-Aug-98, to lugnet.robotics.handyboard)
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| | source for Futaba servo motors?
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My previous source for Futaba (and compatible) servo motors, Images Company of Staten Island, NY, tells me they can no longer get them unless they're bundled with RC transceivers. Anybody have another source for just the servo motors? I want 6 (...) (27 years ago, 17-Aug-98, to lugnet.robotics.handyboard)
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| | 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! (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (27 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 (...) (27 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> (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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, (...) (27 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 (...) (27 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, (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (...) (27 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. (27 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 (27 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 (...) (27 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 (...) (27 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 (...) (27 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 (27 years ago, 6-Aug-98, to lugnet.robotics.handyboard)
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