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</o:shapelayout></xml><![endif]--></head><body lang=CS link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>DD,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>rad bych se zeptal zkusenych uzivatelu one-wire komunikace, jestli se nekdy setkali s chybne vyctenou teplotou z one-wire cidla (treba 18B20). Uvazovana konfigurace je one-wire master proti jednomu slave cidlu na delsim kabelu (desitky metry) v rusnem prostredi (nejake menice, motory, ...). Samotna komunikace ma vestavenou kontrolu, takze by asi chybna data nemela dovolit prenest, ale zajima me, jestli jste se nekdo nekdy nesetkal s chybnou (dobre prenesou) hodnotou z cidla (tj. ze to zmerilo uplnou nebo mensi blbost). Myslenkova uvaha smeruje k tomu, ze cidlo je parazitne napajene z toho dlouheho kabelu, v sobe ma nejaky kondenzator Cp a z nej se po celou dobu provozu "samonapaji". Takze, je treba mozne, ze to ruseni "prosakne" do napajeni a poskodi merici proces.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Osobne provozuji nekolik desitek 1w cidel, ale bohuzel bez ruseni (nejvetsi ruseni je bzukot vcel) a ty behaji zcela bez problemu ...<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Predem diky za reakce, pekny vikend. JM<span style='font-size:10.5pt;font-family:Consolas;mso-fareast-language:CS'><o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>