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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Dobrý den,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>podobná zapojení jsme také zkoušeli a fungují docela dobře. Dají
se najít i u Maxima, třeba tady </span><a
href="http://www.maxim-ic.com/appnotes.cfm?an_pk=4255">http://www.maxim-ic.com/appnotes.cfm?an_pk=4255</a>
. <o:p></o:p></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>S 1-wire sběrnicí je často problém s EMC (s průnikem
rušení do DS18B20, který pak opravdu začne dělat zajímavé věci). Takže se pak stejně
osvědčilo dát ke každému DS18B20 malý procesor a budič RS485.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>S pozdravem<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>ing. Pavel Poucha<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>jednatel<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Papouch s.r.o.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Strašnická 1a<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>102 00 Praha 10<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Tel: +420 267 314 267-8<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Fax: +420 267 314 269<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>papouch@papouch.com<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Chcete-li, navštivte naše stránky http://www.papouch.com <o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm'>
<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
hw-list-bounces@list.hw.cz [mailto:hw-list-bounces@list.hw.cz] <b>On Behalf Of </b>Martin
Záruba<br>
<b>Sent:</b> Saturday, May 30, 2009 7:39 PM<br>
<b>To:</b> HW-news<br>
<b>Subject:</b> Posileni 1-wire<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Bezne
pouzivam az 10 teplomeru DS18B20 na 1-wire sbernici rizene AT89C2051. Vse
chodi bez problemu, pokud jsou privodni kabely tak do 5m. Pri vetsi vzdalenosti
se prudce zvysovaly problemy s komunikaci s teplomery. Prilis nepomohl ani
koaxialni kabel. Ukazalo se, ze problem je v tom, ze teplomery neutahnou prilis
velkou kapacitu sbernice. Pomohlo ale toto trivialni posileni:</span><o:p></o:p></p>
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<p class=MsoNormal><img border=0 width=220 height=204 id="_x0000_i1025"
src="cid:image001.png@01C9E1DA.A19B7610"><o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Bez
problemu chodil teplomer pres 100 m dvoulinku i pres 100 m koaxu (vice jsem
nemel). Mozna, ze se to nekomu bude hodit.</span><o:p></o:p></p>
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<p class=MsoNormal> <o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif"'>Martin
Zaruba</span><o:p></o:p></p>
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