 | | 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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| | (canceled)
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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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| | Re: resistor pull-up help!
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the exp bd inputs plug into the inputs on the main HB. so you still have to remove the pullup on the main HB. just cut the short trace on the underside of the board between the signal input pin and the pullup resistor. f. In your message you said: (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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| | Re: handy board troubles...
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Actually Jake, I'm having a similar problem right now, with regard to loss of RAM capabilities. I've been testing a new Polaroid 6500 sonar (which now works!) on the HB and I've got it hooked up through the exp. board. I tried to run a simple (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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| | resistor pull-up help!
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Hi all, I'm trying to connect a pair of GP2D12 to my handyboard. I know there is an issue with the handyboard pull-up resistors and these devices so I figured I'll try to use the unused LEGO sensor connectors on my expansion board (I don't have any (...) (25 years ago, 21-Mar-00, to lugnet.robotics.handyboard)
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| | RE: Required tools for assembly
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Bob: If you have major problems with the handyboard you would have better luck with a logic analyzer than with an oscilloscope, however, I have build two handy boards successfully without any of these tools straight out of the box. Just be careful (...) (25 years ago, 20-Mar-00, to lugnet.robotics.handyboard)
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| | Required tools for assembly
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Can somebody please tell if it is absolutely necessary to have an oscilliscope for the assembly of and H board? If so, what are my INEXPENSIVE options/suppliers? What is a logic probe? is it a 5vdc test lamp? Can I get this kind of stuff at radio (...) (25 years ago, 20-Mar-00, to lugnet.robotics.handyboard)
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| | handy board troubles...
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Hi, A while ago I shorted out my handy board which caused the ram chip to fry. I've since replaced it, and the board boots again, but I am now seeing other strange behaviour. The batteries are connected and the board recieves power, but when I turn (...) (25 years ago, 20-Mar-00, to lugnet.robotics.handyboard)
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| | Expansion board problems
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Hi Finaaly got my exp board working and now yet another problem. When checking sensors, every 4 secs or so I always get 255.(when printing sensor value to screen would be like : 2,2,2,2,2,2,2,255,2,...,255,etc., i knew its not the sensor because (...) (25 years ago, 18-Mar-00, to lugnet.robotics.handyboard)
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| | Sonar
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Hi I use a Polaroid sonar ranging modul with the HB and the expansionboard. It all went well, but by mistake i put the digital in from J12 to a digital out. Since then i get the result -1 and the sonar isn't clicking. I've tried with another sonar (...) (25 years ago, 18-Mar-00, to lugnet.robotics.handyboard)
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| | Reset of handy board
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hi, may i ask how much current passing through HB will cause the HB reset ?? i have a big problem on my HB, I power one Polaorid 6500 sonar, 1 servo and 2 hacked servos by seperated 6V 1300mAh NiMH battery with common ground, and power 2 GP2D02 by (...) (25 years ago, 18-Mar-00, to lugnet.robotics.handyboard)
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| | IR emitters !
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Hi ! Can we connect two ir emitters to the HB IRout port (female connector J7) for left and right obstacle detection ? If so ! how do we distinguish between the left IR led and right IR led transmission since I'm planning to use only one Ir detector (...) (25 years ago, 18-Mar-00, to lugnet.robotics.handyboard)
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