I'm having intermittent problems with some of my sensors and want to get options from some of you.
I have recently installed several of the Oregon Scientific temp sensors around my house. As I get experience with them I am noticing that every now and then some seem to "flat line" or keep the same temp reading even though the temp is changing as shown below. The mcsTemperature software that produced this graph is supposed to set invalid data to 0, so seeing it "flat line" several times raises questions in my mind as to the real reason why.
Since I'm going to close a temp control loop around some of them this could be a fatal problem. My question is regarding the fact that most of these sensors have the option to pick 3 channels. Most of these sensors also seem to transmit twice in succession to improve interference situations.
So how many sensors can you put on a chanel reliably?
Common sense tells me only one, that this is the source of my problems, and therefore I can only use three 433MHz sensors. But I have a need for at least 6 of these sensors, plus eventually adding an RFXcomm RFXmeter for my 3 utilities.
I'm using the following Oregon units:
THGR122NX (4x)
THC138 (hope to replace with a THWR800) (1x)
UVR128 (1x)
In the 6 hour picture below Outside Shade Sensor flatlines 4 to 6 times, with a big one for ~90 minutes. The pool sensor was on the same channel (#2) but had no problems at all. I've seen the situation reverse in the past.
I have recently installed several of the Oregon Scientific temp sensors around my house. As I get experience with them I am noticing that every now and then some seem to "flat line" or keep the same temp reading even though the temp is changing as shown below. The mcsTemperature software that produced this graph is supposed to set invalid data to 0, so seeing it "flat line" several times raises questions in my mind as to the real reason why.
Since I'm going to close a temp control loop around some of them this could be a fatal problem. My question is regarding the fact that most of these sensors have the option to pick 3 channels. Most of these sensors also seem to transmit twice in succession to improve interference situations.
So how many sensors can you put on a chanel reliably?
Common sense tells me only one, that this is the source of my problems, and therefore I can only use three 433MHz sensors. But I have a need for at least 6 of these sensors, plus eventually adding an RFXcomm RFXmeter for my 3 utilities.
I'm using the following Oregon units:
THGR122NX (4x)
THC138 (hope to replace with a THWR800) (1x)
UVR128 (1x)
In the 6 hour picture below Outside Shade Sensor flatlines 4 to 6 times, with a big one for ~90 minutes. The pool sensor was on the same channel (#2) but had no problems at all. I've seen the situation reverse in the past.
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