 | | 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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