Hello everybody, I have reimplemented Patryk schematics with some minor changes. Photo on breadboard is here: http://i.imgur.com/gUcFq.jpg . I can say that it works :) I have lost about two days to figure out why the MC doesn't get recognized by my laptop. The problem was in Zener diodes, my were too powerful, one should use 0.5W and I had 1W. So I dropped voltage from USB to 3.6V (two transistors on breadboard) and powered MC and DS2482-800 by 3.6V. And I changed i2c pullup resistors to 2.2k, as it suggested by DS2482-800 datasheet.
To conclusions. On 3.6 voltage 1-wire is very slow, reading temperature from powered DS18B20 in high resolution takes about 3-3.5 sec. I tried to attach i2c pullup resistors and DS2482-800 to 5V bus, but this makes system unstable. (Even hang my PC several times) Also there some weird owfs(?) bugs there. If I mount owfs on my laptop, everything is ok, I see 8 empty buses, but if I start owserver and connect owhttpd to it, owhttpd shows only bus.0 and all other buses are inside it. Second, and the most unpleasant thing, that my adapter doesn't work on an arm system. If I connect it to my arm box I see only one bus.0 and _some_ devices on 1-wire bus. I tried both 2.8p13 and 2.8p14. This is not power issue, I have placed external 5V from power supply and this doesn't change the picture. This week I will buy "right" Zener diodes and try my prototype with them. Also I will try to attach some DS2482-100. And some random thoughts, also: 1) I was told on some forum (it is in Russian, so links are useless here), that DS2482-800 doesn't proceed 1-wire lines in parallel. If so, I guess multiple (we can have up to 4) DS2482-100 will be much better 2) If one can combine existing 1-wire master code for AVR (STM?) MCs with existing usb code, we can obtain a "dream device", a native usb 1-wire master in one cheap IC! Best Regards, Ivan, PhD On Fri, Apr 27, 2012 at 1:20 AM, Patryk <p4tr...@o2.pl> wrote: > just want to share some progress > > I added two more 1-wire masters DS2482-100 and DS2483 with RJ-12 > connectors. The purpose is to compare the performance It's > not finished yet but the placing is more or less final. I will have to > straighten the paths but I think the board can be one sided with few wires > on the top layer. I dont't know wich transistor to choose for DS2482-100. > I don't know if it's some standard but I used a Z-80 case 83mm x 113 mm. > It's a bit larger than Eagle freeware version allows but the wiring fits > on 100x80. > I was also wondering which standard of wiring RJ45 to use. I decided that > I will use the same as RJ12 so the same flat 6/4 wire telephone cable can > be put int rj45 plug and be compatible with RJ12. > > I was also wondering about DS9503 protection diodes. Will they do their > job if the other lines(I mean +5V and GND are not protected). > > Here's Eagle project. > http://ubuntuone.com/2sUJLP2JhCS63IC3YEdHJ8 > > I also made a lib with the new DS2483 but it's my first lib so it's not > finished but the package outline is right and that what's matter for now. > > http://ubuntuone.com/2xVbCWfotiP8bLSvruE3PD > > I welcome any suggestions. Bear in mind that I'm not an electronic > engineer and may mad some obvious mistakes. > > -- > p4trykx > > ------------------------------------------------------------------------------ > Live Security Virtual Conference > Exclusive live event will cover all the ways today's security and > threat landscape has changed and how IT managers can respond. Discussions > will include endpoint security, mobile security and the latest in malware > threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
