 | | Re: HBridge LMD18200
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Its a MOSFET based bridge, the Vgs potential needed to put the FETs into full enhancement mode is 11.2v or thereabouts. At lower voltages the FETs operate in their linear range (their Rds value goes up) and they dissipate much more heat. (As Rds (...) (27 years ago, 20-Mar-98, to lugnet.robotics.handyboard)
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| | HBridge LMD18200
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Hello, First thanks for your answers regarding H-Bridges and especially the LM18200. This H-Bridges would be used with 12V DC motors which can sink up to 12Amp each and I have plenty of room to put them. But there is still something that puzle me : (...) (27 years ago, 19-Mar-98, to lugnet.robotics.handyboard)
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| | IR input sensor
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Hey! I was wondering if anyone has written any sort of fairly simple program that can detect another handyboard by using the IR input sensor. Does this require anything else besides maybe an analog IR sensor and the sensor on the board? If you could (...) (27 years ago, 19-Mar-98, to lugnet.robotics.handyboard)
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| | mailing list
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Please remove me from your list> (27 years ago, 19-Mar-98, to lugnet.robotics.handyboard)
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| | Re: Polaroid sonar connector
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Easy solution. Why waste so much time looking for connectors. Just remove the connector and solder some wires to the board and run those wires to whatever kind of connector you want! -----Original Message----- From: Will Bain <willbain@cs.umt.edu> (...) (27 years ago, 19-Mar-98, to lugnet.robotics.handyboard)
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| | Re: H-Bridge
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Hi talking about the H-Bridge.....we are building one here for a 1.5 kW motor with maximal power output of 2.2 kW. This one works with 400V but is also developped for a current of a little more than 10 A (actually 15A). It will be chopped with a (...) (27 years ago, 19-Mar-98, to lugnet.robotics.handyboard)
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| | H-Bridge
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Thanks everyone..Ill check those out. Im probably not going to do anything that requires soldering things on the handy board. Unfortunatly, im only borrowing this one. I'll just see if i can borrow a rover with less power hungry motors from the (...) (27 years ago, 19-Mar-98, to lugnet.robotics.handyboard)
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| | RE: H-Bridge
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This suggestion isn't even close to what you require, but it may meet the needs of others on the list who are looking for an alternative H-bridge: (URL) can go to 3.5A at 35vdc, and is serially controlled. I don't think it would be hard to build a (...) (27 years ago, 19-Mar-98, to lugnet.robotics.handyboard)
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| | defer() ?? [DAT]
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(...) The defer function is used in multithreaded programs when one process doesn't require all the processor cycles that it would ordinarily be allotted. Typically, if you have multiple processes (threads, tasks, whatever) running at the same time, (...) (27 years ago, 19-Mar-98, to lugnet.robotics.handyboard)
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| | defer() ??
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Hi ! Does anybody know how the defer() function works ? Also, what are its applications ? Thanks, Sudeshna * %%%...%%% * * * * Sudeshna Banerjee, * * E-mail :sxbanerj@cs.twsu.edu * * @ee.twsu.edu * * * * %%%...%%% * (27 years ago, 19-Mar-98, to lugnet.robotics.handyboard)
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| | Re: H-Bridge
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Hello François, HandyBoard group, We had a similar problem when we tried using an R/C model as a mobile base platform for our robot. Searching the net turned up the LMD18200 (3A, 55V H-Bridge) from National Semiconductors, which was suitable for (...) (27 years ago, 18-Mar-98, to lugnet.robotics.handyboard)
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| | Re: Power
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Richard wrote:<snip, stuff deleted> (...) Ah, that takes me back a bit. I built one in the late 60's from plans in Practical Electronics, used about 40 transistors and mechano bits. Its collision avoidance sensor was based around an OCP71 photo (...) (27 years ago, 18-Mar-98, to lugnet.robotics.handyboard)
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| | H-Bridge
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Hello, I am also searching for a preassembled H-Bridge (12 Volt max 10 Amp in continuous mode). If anyone knows a good place to order one, I would be very interested. (We already tried to build the H-Bridge from Chuck Mac Manis but its components (...) (27 years ago, 18-Mar-98, to lugnet.robotics.handyboard)
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| | H-Bridge
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It is clear to me that if i even attempted any work with construction and installation of a H Bridge for my handyboard it would be left a blackened, smoldering wreck. So this is my question.....is there any where to get a preassembled H-bridge from (...) (27 years ago, 18-Mar-98, to lugnet.robotics.handyboard)
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| | Re: Power
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I've built a few of his machines myself. The "Neural Net" is a 74ls244 set up as a shift register with RC networks between each stage. The walkers go forward ok, but can't turn or back up. Mark Tilden's very talented at mechanical design, though! (...) (27 years ago, 18-Mar-98, to lugnet.robotics.handyboard)
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| | Re: Power
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I've been having very good luck with designing an entire robotic ecosystem using only analog components! Predators, Herbivores, plants, the works! (...) (27 years ago, 18-Mar-98, to lugnet.robotics.handyboard)
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| | Re: Polaroid sonar connector
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(...) According to my measurements, the flat flex cable that comes with the Polaroid kits is 1.25 mm (or 0.05"), so it would probably not be quite compatible with the parts that Digikey offers. I looked exhaustively through the Digikey offerings, (...) (27 years ago, 18-Mar-98, to lugnet.robotics.handyboard)
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| | Re: Power
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I didn't see the program, but I have an article my brother cut out of a newspaper and sent me, the guy's name is Mark Tilden, he makes all his robots out of old walkmans and pagers etc. I find his claims kind of hard to believe also. He has a (...) (27 years ago, 18-Mar-98, to lugnet.robotics.handyboard)
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| | Re: Low battery detection
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sure, it will drain the battery, but if it's a low enough drain, you don't have to worry about it. for example if you have a 10 amp-hour battery, drawing .5 mA would take something like 830 days to drain it. I wouldn't worry too much. to calculate (...) (27 years ago, 18-Mar-98, to lugnet.robotics.handyboard)
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| | RE: Nowbody can help me???
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I never say imagecraft C can't use peek and poke???? I can see, you don't understand my mail. Wich i see is : make beep the handy is not simply put a byte in a place into the memory, no way. you have to write a interrupt routine , and do adiitional (...) (27 years ago, 17-Mar-98, to lugnet.robotics.handyboard)
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