 | | Re: Miniboard download random failures
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(...) "expected (...) James, Yes, I am running from a DOS window in W9X. Do I have to boot to DOS mode to correct for this? Uhm, I'm a Mac person, so, have patience, how does one boot to DOS instead of Win95? thanks, DLC (24 years ago, 5-Oct-00, to lugnet.robotics.handyboard)
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| | Re: Miniboard download random failures
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(...) Are you running DLM from a dos window in Win9x? I've had this problem but it usually stops when I run it in DOS. Just a thought. -Jim Munro <jimmn@xnet.com> (24 years ago, 5-Oct-00, to lugnet.robotics.handyboard)
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| | Freeware ICC11 and bad iasm11.exe?
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Me again, I just got the ICC11 freeware from the Miniboard site and installed it, moving the crt.s over as it says to do in the docs, etc. I tried to compile the test compile of icc11 dhry.c printf.c and got a LOT of "phasing" errors, whatever that (...) (24 years ago, 5-Oct-00, to lugnet.robotics.handyboard)
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| | Miniboard download random failures
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Hello, I just finished building a Miniboard using the HC811E2 processor. After swapping the Rx and Tx lines on my serial cable the download and reset switch do as the manual says. However, when I use dlm to download a program the bootstrap section (...) (24 years ago, 5-Oct-00, to lugnet.robotics.handyboard)
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| | serial communication
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Hi.. I am also facing problem in serial communications. My problem is that I am trying to use the handyboard to drive a modem. I have used a cross-serial cable to connect my handyboard's external serial board to a modem. But whenever I run my app, (...) (24 years ago, 5-Oct-00, to lugnet.robotics.handyboard)
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| | R: communication via serial port
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Using java and comm API ? ----- Original Message ----- From: Ray Tang <raytang_1@hotmail.com> To: <handyboard@media.mit.edu> Sent: Thursday, October 05, 2000 4:49 AM Subject: communication via serial port (...) and (...) the (...) a (...) (24 years ago, 5-Oct-00, to lugnet.robotics.handyboard)
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| | Linux and v1.21 handyboard (fwd)
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Hi, I've successfully located and compiled the IC files for the Handy Board. I can load and run programs on the board, BUT the digital input(s) are not being "seen". E.g. a simple program like: void test3(){ while (1){ if (digital(10)) printf("10 is (...) (24 years ago, 5-Oct-00, to lugnet.robotics.handyboard)
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| | communication via serial port
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Hi, This isn't an off topic question... Has anyone tried programming the serial port (on Linux) to communicate with the Handyboard? I am working on an RF link between the Handyboard and a PC via serial communication, but I don't know much about (...) (24 years ago, 5-Oct-00, to lugnet.robotics.handyboard)
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| | Re: external power
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I am by no means an expert on the subject but this is how I did it. First I cut the heavy motor power trace as shown in the FAQ. Next I soldered a four pin female header on top of the expansion board where the expansion board picks up power for the (...) (24 years ago, 4-Oct-00, to lugnet.robotics.handyboard)
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| | Re: Multiple GP2D02 range sensors
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Greetings, (...) From what I could understand from the documentation ((URL) you could use one timing signal for all of them, as long as each sensor is connected to its own output line (to which the sensor would serially output its 8 bit value). (...) (24 years ago, 4-Oct-00, to lugnet.robotics.handyboard)
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| | external power
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i was wondering if i can modify the handyboard to accept a secondary power supply for the motors and still use the expansion board at the same time. if there is anything else i need to know or do, i would greatly appreciate hearing about it. thank (...) (24 years ago, 4-Oct-00, to lugnet.robotics.handyboard)
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| | Re: Trouble with handyboards
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It is common when polarized caps are put in backwards! Some of those little beggars are hard to see, and easy to get backwards. Other things, such as solder bridges or bad solder joints, can be a problem. Some have even reported finding debris under (...) (24 years ago, 4-Oct-00, to lugnet.robotics.handyboard)
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| | Trouble with handyboards
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I am having students in one of my classes build handyboards, and most are working fine, but some are failing. They all passed intermediate tests, but failed when fully assembled. The most common failure mode that I am seeing results in the (...) (24 years ago, 4-Oct-00, to lugnet.robotics.handyboard)
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| | Multiple GP2D02 range sensors
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I would like to connect multiple (two to four) GP2D02 range sensors to my handyboard. Will each need to have is own timing signal or can they share somehow. If each does need a signal, how many can I connect? Should I get an Expansion Board? any (...) (24 years ago, 4-Oct-00, to lugnet.robotics.handyboard)
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| | Re: announcing handyboard.com !
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Dr. Martin ... Good luck in your new steps down the path of life! -Nick (...) (24 years ago, 2-Oct-00, to lugnet.robotics.handyboard)
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| | announcing handyboard.com !
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Dear Handy Boarders, I'd like to officially announce some changes in the Handy Board world. First, I've left MIT. My last day of work was August 31, 2000. I'm don't have a new job yet, and I'm not sure when (or if) I'll have a normal job. (I do have (...) (24 years ago, 2-Oct-00, to lugnet.robotics.handyboard)
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| | PWM decoding
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I sent this email a while back but didn't get any response so I'm trying again. What I am after is a way to decode the pwm output of a standard radio control receiver (the same signals sent to the servos) into a numerical form that can be used (...) (24 years ago, 29-Sep-00, to lugnet.robotics.handyboard)
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| | flow control with Switch
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I try to use a "switch" instead o using alot of "if... else". I use the one like a normal C compiler, but it doesn´t work. What can I do?. Daniel (24 years ago, 29-Sep-00, to lugnet.robotics.handyboard)
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| | Found C7
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Fred, Thanks for the tip. You're right - it is printed on the board itself. I found it as soon as I put on my glasses. :-) Steve Mosiman (24 years ago, 26-Sep-00, to lugnet.robotics.handyboard)
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| | Re: Capacitor on Sonar Board
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look on the polaroid board itself. it has (or used to, anyhow) a blank space where you could mount a component that is labeled "C7". the cap goes there. if you absolutely cannot find a spot on the polaroid board labeled C7, they must have updated (...) (24 years ago, 26-Sep-00, to lugnet.robotics.handyboard)
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| | Capacitor on Sonar Board
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The instructions on connecting the Polaroid Ultrasonic Ranging System to the Handy Board (at (URL) say to be sure and install the 0.1 uF capacitor in the C7 position on the sonar board. It is unclear what is meant here. Is this refering to the (...) (24 years ago, 26-Sep-00, to lugnet.robotics.handyboard)
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| | Out of Office AutoReply: robot contest
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I'm out of the office starting Mon, 9/25, returning Thurs., 9/28. Call Mike Kaphon 11325 with urgent matters. Thanks. (24 years ago, 25-Sep-00, to lugnet.robotics.handyboard)
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| | robot contest
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Ever wanted to join a robot contest? No events in your area? Give your robot a try at F.IRC. Join the First Internet Robot Contest (F.IRC) for robotics hobbyists around the world. No entrance fee! DATE: Oct 1 – Nov 30 (URL) 20+ attractive prizes: (...) (24 years ago, 25-Sep-00, to lugnet.robotics.handyboard)
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| | Re: Batteries again, sorry
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you're almost right. if you plugged a nimh pack into the HB's charge jack, the external pack would charge the internal batteries. but it would not power the board significantly. this is because the HB's charge jack includes a current-limit resistor (...) (24 years ago, 22-Sep-00, to lugnet.robotics.handyboard)
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| | Batteries again, sorry
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This should be my last question in terms of batteries. Assuming that I have nicads powering the HB, what effect would there be if, when the batteries were getting low, I connected a fully charged battery pack (e.g. containing the nimh cells) into (...) (24 years ago, 22-Sep-00, to lugnet.robotics.handyboard)
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| | Re: Batteries again
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in theory this can be a problem. in practice, as long as the nicads are occasionally allowed to fully discharge, they'll last for a good long time in fine condition. fred In your message you said: (...) es. (...) (24 years ago, 22-Sep-00, to lugnet.robotics.handyboard)
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| | Batteries again
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As Fred is recommending using nicads due to the constant trickle charge when connected to the mains adapter I have a question regarding the nicad batteries. If the batteries are trickle charged before they are fully discharged (usual practice I (...) (24 years ago, 22-Sep-00, to lugnet.robotics.handyboard)
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| | Re: Possible error in assembly guide.
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Are you getting a good ground???...??? If it works.. then hey! RS232 is +10 to -10 but there is room for slop! +7 to -7 will work too!!!!!!! It just won't drive a cable to the max length of the RS232 spec. Most of the time though people just don't (...) (24 years ago, 22-Sep-00, to lugnet.robotics.handyboard)
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| | Possible error in assembly guide.
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Near the end of the "interface/charger serial circuit" heading of the "Assembling The Handy Board" guide, it says measure the voltage of pin 6 of the MAX232, I did that and got -9.5 which is correct. Then I connected pin2 of j9 and pin6 of max232 so (...) (24 years ago, 22-Sep-00, to lugnet.robotics.handyboard)
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| | Re: nimh batteries
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the issue with nimh is that plain trickle charge is not appropriate. you must remove charge current when the cells are full charge. the HB charge circuit just doesn't do that. i'd really recommend switching back to nicad. fred In your message you (...) (24 years ago, 21-Sep-00, to lugnet.robotics.handyboard)
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| | Re: nimh batteries
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Would installing a diode (power diode, >3A ?) into the +ve line of the battery pack be suitable to prevent the power circuitry of the HB from trying to recharge the nimh cells ?. Or do I actually need to do anything at all ?, i.e. the nimh cells (...) (24 years ago, 21-Sep-00, to lugnet.robotics.handyboard)
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| | Spazbotlink
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OOPS sorry, I forgot to give the complete url It's nfn.no-ip.com/spazbot (24 years ago, 21-Sep-00, to lugnet.robotics.handyboard)
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| | Spazbot Homepage updated.. adding more!
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OK.. So now that my Explorer code has been perfected and I got more of the servo twitch out of Spazbot, I found time to update the web site! (URL) I registered with the Dynamic DNS nameserver, lets see how well it works. Just before my DHCP lease (...) (24 years ago, 21-Sep-00, to lugnet.robotics.handyboard)
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| | I need help! ! !
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Hi everyone, I'm studying C programing now, but I've had my handy board for more than a year now, I want to now if anyone has a small project, just a motor and some sensors, with all the code I have to put, and how to put the code in the IC program (...) (24 years ago, 19-Sep-00, to lugnet.robotics.handyboard)
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| | Re: nimh batteries
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Should I modify the hb circuit to disable the recharge circuitry if I am using nimh batteries or will the circuitry just not recharge the batteries ?, i.e. no damage to the cells by using them on an 'as-is' board. As an extra question to the list in (...) (24 years ago, 19-Sep-00, to lugnet.robotics.handyboard)
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| | Re: Battery Power and handyboard.
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i'm not sure if wiring two nicad packs in parallel is a good idea. the packs would fight each other if either one's voltage varied even slightly from the other. i'd recommend either (1) John's initial suggestion of adding a separate pack solely for (...) (24 years ago, 19-Sep-00, to lugnet.robotics.handyboard)
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| | Re: Fuzzy Logic
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(...) The Motorola reference manual (cpu12rm.pdf at motorola-site) of the 68hc12 (successor of 6811) section 9 has a practical approach to fuzzy logic. The special 68hc12 instructions are easy to implement in 68hc11 code. ntk. (24 years ago, 19-Sep-00, to lugnet.robotics.handyboard)
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| | Re: Battery Power and handyboard.
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I am currently using nickel hydride AA cells in two 4-cell battery boxes and so far during my construction and testing of the board they have not needed recharging yet. I didn't have access to a mains power supply most of the time, so after checking (...) (24 years ago, 19-Sep-00, to lugnet.robotics.handyboard)
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| | Re: Battery Power and handyboard.
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Jerry, I really haven't timed how long a battery charge lasts on the Handyboard but I did add a second 9.6v battery pack for the purpose of isolating the motor power from the logic circuit power. I did this to eliminate motor RF interference to the (...) (24 years ago, 19-Sep-00, to lugnet.robotics.handyboard)
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| | Battery Power and handyboard.
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Hi, Quick question. How much runtime are you getting with your Handyboard based robot? With sonar /IRPD pinging once per second and my sensor array being controlled by two servos and my Lego motors pushing the 6 wheel drive rover I am getting 2Hrs. (...) (24 years ago, 19-Sep-00, to lugnet.robotics.handyboard)
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