1-wire long distance strange problem
hello!
i moved project table central stove.
( watch temperatures on screens; 2xlcd, 5x7segment , 17x ds28b20 sensors )
i have aprox. 35-40m long cable. on table work sensors, without reading error (-127) every few seconds.
in case have arduino on table in room, aprox 20m first sensor, , continue connected different ends, additional 15m cable. instead of resistor, used potentiometer 5kohm,
which set on aprox 1.5ke. works great. have server on arduino displaying temperatures @ web , pc software monitoring every 30second.. ok
now moved arduino central stove, normaly connect, insert on arduino side potentiometer,
and here start problem reading. can not figure out exact value of resistance work normaly.
always error on sensors. sensor3 , then7, 14 etc....
what cause of error reading @ other end?
i use utp cat5 cable, blue=+5v, brown=gnd , blue-white data. other wire empty.
in attachments sketch of connection.
thanks advice!
i moved project table central stove.
( watch temperatures on screens; 2xlcd, 5x7segment , 17x ds28b20 sensors )
i have aprox. 35-40m long cable. on table work sensors, without reading error (-127) every few seconds.
in case have arduino on table in room, aprox 20m first sensor, , continue connected different ends, additional 15m cable. instead of resistor, used potentiometer 5kohm,
which set on aprox 1.5ke. works great. have server on arduino displaying temperatures @ web , pc software monitoring every 30second.. ok
now moved arduino central stove, normaly connect, insert on arduino side potentiometer,
and here start problem reading. can not figure out exact value of resistance work normaly.
always error on sensors. sensor3 , then7, 14 etc....
what cause of error reading @ other end?
i use utp cat5 cable, blue=+5v, brown=gnd , blue-white data. other wire empty.
in attachments sketch of connection.
thanks advice!
that schematic helpful. doesn't show power. sensors powered 5v on cat-5 cable?
1.5k seems low resistance. sensors have pull voltage down 0 send data. aren't helping them choosing low resistance.
1.5k seems low resistance. sensors have pull voltage down 0 send data. aren't helping them choosing low resistance.
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