 | | Re: servo ports on Exp board...help?
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Hi again, I should have mentioned this in the first message. In our case, the motor that was causing the problems was a fan motor (to blow out a candle) and it was completely electrically isolated from all of the other circuitry. It had its' own (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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| | Re: handy board troubles...
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re: this problem with the memory contents not persisting, check the separate power supply to the RAM (U14). you might need to remove all socketed ICs from the board 'cause power can bleed to chips via input pins. also check that U12 the DS1233 is (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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| | Re: servo ports on Exp board...help?
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Hi, We saw this exact problem last year. Our servos went so crazy that they actually destroyed their gears and had to be scrapped. The fix is simple, solder a capacitor across the motor leads. The motor causes noise on the lines which the servo (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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| | servo ports on Exp board...help?
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Hi the servo ports on my expboard seem to work fine, but when the servos are'nt active ( init_expbd_servos(0); ) and a motor is turned on the ports go crazy , servos will turn eratically, with hacked servos they just move in one direction. Would a (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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| | Re: handy board troubles...
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(...) Sorry about this, I meant 32K. John (...) completely (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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| | Re: handy board troubles...
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(...) Yes! I apologize, I meant "..._without_ the RJ11 cord connected..." Is it possible a surge could have fried the RAM and now it won't hold memory? That was my contention, but I'm not sure... John p.s. RAM replacement question: Will any 64K CMOS (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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| | Re: Acroname robotics...
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(...) Acroname certainly seems to be the best source for the GP2D12 and Polaroid sonar. (...) I'm a fool, too. That's why I went with the fully assembled & tested Handy Board from Patrick Hui. The only things I had to add were the NiCd battery and (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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| | Re: handy board troubles...
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(...) ^^^^ Do you mean without? That's my problem; the board only holds its data if the cord is plugged in. (...) I've also got a servo which I can't figure out how to drive from the exp. board, but the problem of the RAM discharging happens even (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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| | Acroname robotics...
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I am looking to buy a Handy Board, Expansion Board, motors, GP2D12 sensors, Polaroid 6500 instrument package, and maybe the Eltec sensor. I will likely use Acroname, as they appear to have pretty good prices and I can save a few $$ on shipping. Has (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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