 | | 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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