 | | Re: H-Bridge
|
|
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)
|
| |
| | H-Bridge
|
|
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)
|
| |
| | RE: H-Bridge
|
|
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)
|
| |
| | defer() ?? [DAT]
|
|
(...) 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)
|
| |
| | defer() ??
|
|
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)
|
| |
| | Re: H-Bridge
|
|
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)
|
| |
| | Re: Power
|
|
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)
|
| |
| | H-Bridge
|
|
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)
|
| |
| | H-Bridge
|
|
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)
|
| |
| | Re: Power
|
|
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)
|
| |
| | Re: Power
|
|
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)
|
| |
| | Re: Polaroid sonar connector
|
|
(...) 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)
|
| |
| | Re: Power
|
|
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)
|
| |
| | Re: Low battery detection
|
|
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)
|
| |
| | RE: Nowbody can help me???
|
|
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)
|
| |
| | Re: pneumatics
|
|
I think it was the crazy guys in Austin (the ones that put on Robofest) that had a 'portable' air reservoir that consisted of a 2 liter coke bottle, a relief pressure valve and tubing. The coke bottle was filled about a third of the way with water, (...) (27 years ago, 17-Mar-98, to lugnet.robotics.handyboard)
|
| |
| | RE: Low battery detection
|
|
Can you translate this into "EE for dummies?". I slowly start to grasp some of the idea about voltage dividers but still don't understand. Won't this setup drain the battery? How does one calculate and wire such a thing - in this particular case? I (...) (27 years ago, 17-Mar-98, to lugnet.robotics.handyboard)
|
| |
| | Re: Power
|
|
Perhaps your motors draw too much current. You can only draw 600mA from the L293D driver IC. In the HB manual, you can see you can draw 1A from a IC from TI. (I don't know the exact number right now). You could try to use a seperate IC for each (...) (27 years ago, 17-Mar-98, to lugnet.robotics.handyboard)
|
| |
| | Re: Power
|
|
Perhaps the problem is your motor-drivers IC's. If you use the L293D or something, which are standard on the HandyBoard, you can only draw abou 600 mA. I use the other ones mentioned in the HB manual (they're from Texas Intr., but I can't remember (...) (27 years ago, 17-Mar-98, to lugnet.robotics.handyboard)
|
| |
| | Re: Power
|
|
Perhaps the problem is your motor-drivers IC's. If you use the L293D or something, which are standard on the HandyBoard, you can only draw abou 600 mA. I use the other ones mentioned in the HB manual (they're from Texas Intr., but I can't remember (...) (27 years ago, 17-Mar-98, to lugnet.robotics.handyboard)
|
