Re: [Owfs-developers] 85 degree reading means error, readout timing, error should be filtered

2017-01-09 Thread fli4l
Hallo Jan,ich arbeite im Projekt FLI4l (Ein Softwarerouter)in Verbindung mit OWFS.Auf dem Router läuft nun zur Datenerfassung diverser Werte auch nochdie Erfassungssoftware collectd (www.collectd.org) mit dem darin vorhandenenplugin "onewire".Dieses Plugin arbeitet direkt mit OWLIB zusammen und

Re: [Owfs-developers] 85 degree reading means error, readout timing, error should be filtered

2017-01-09 Thread Jan Kandziora
Am 09.01.2017 um 09:33 schrieb fl...@franke-prem.de: > Hello, > sorry for the confusion. > The reading by me has nothing to do with the 85 degree values. > It was only the hint, when readout values with the OWLIB Connection, > that then the values by reading with only "latesttemp" will be not

Re: [Owfs-developers] 85 degree reading means error, readout timing, error should be filtered

2017-01-09 Thread fli4l
Hello,but the "simultanues/temperature bit" Need  external powered sensors as i suggest.So what is when you have sensors with paratite-power?And i suggest that you will Trigger the simultaneous/temperature bit manually in your external application. Not directly inside the OWFS code.Best

Re: [Owfs-developers] 85 degree reading means error, readout timing, error should be filtered

2017-01-09 Thread fli4l
Hello,sorry for the confusion.The reading by me has nothing to do with the 85 degree values.It was only the hint, when readout values with the OWLIB Connection,that then the values by reading with only "latesttemp" will be not updated.This is the Problem by me.Best regards,Roland Jan Kandziora

Re: [Owfs-developers] 85 degree reading means error, readout timing, error should be filtered

2017-01-08 Thread Ekkehard Pofahl
Thanks for all the replies. *Suggestion :* *IF *reading == 85 *then *ignore reading I will now implement something like this for each reading of the OWFS server. Most probably I will add the following else branch : *else *reading = last_reading Even if there is a valid 85 degree measurement,

Re: [Owfs-developers] 85 degree reading means error, readout timing, error should be filtered

2017-01-08 Thread Mick Sulley
I don't know if this will help to explain the operation, but my code runs in a continuous loop - * Read all temperatures * Set the simultaneous/temperature bit * Perform logic operations, setting outputs to devices based upon temperatures read, etc * Log values to database * repeat.

Re: [Owfs-developers] 85 degree reading means error, readout timing, error should be filtered

2017-01-08 Thread Jan Kandziora
Am 08.01.2017 um 19:39 schrieb Roland Franke: >> >> It's still in there, as Stefano found the real bug causing problems with >> .../latesttemp. > > But this has also an problem (For me). I will read over OWLIB from the > OWSERVER values out (Let me say the program collectd will read it with > the

Re: [Owfs-developers] 85 degree reading means error, readout timing, error should be filtered

2017-01-08 Thread Roland Franke
Hello, >>> ... >>> This has all been taken care for already, OWFS repeats a >>> .../temperature triggered conversion for the case 85°C is the result. >>> When you still have stray 85°C readings, it means your power failures >>> are so serious you should check your hardware setup. >> >> Is that

Re: [Owfs-developers] 85 degree reading means error, readout timing, error should be filtered

2017-01-08 Thread Colin Reese
If there is no way to distinguish 85 error/power up from 85 valid, you cannot filter it. Period. It must all be done on the other side of owfs, and the user strategy for this depends on application and expected results. You could add flags like last_was_85, or a time stamp last_non_85, but

Re: [Owfs-developers] 85 degree reading means error, readout timing, error should be filtered

2017-01-08 Thread Jan Kandziora
Am 08.01.2017 um 17:05 schrieb Colin Law: > > It is surely undeniable that this is a design flaw in the chip. Much > more sensible would have been to make it default to full scale (or > full negative scale), then it would have been much easier to program > around. > Full scale values mean there

Re: [Owfs-developers] 85 degree reading means error, readout timing, error should be filtered

2017-01-08 Thread Colin Law
On 8 January 2017 at 14:59, Jan Kandziora wrote: > Am 08.01.2017 um 14:54 schrieb Ekkehard Pofahl: >> >> I am using OWFS since more than two years in different versions on a Raspi >> 2. This alone shows, that I think it is a very good program. >> >> From time to time there is the "85

Re: [Owfs-developers] 85 degree reading means error, readout timing, error should be filtered

2017-01-08 Thread Jan Kandziora
Am 08.01.2017 um 14:54 schrieb Ekkehard Pofahl: > > I am using OWFS since more than two years in different versions on a Raspi > 2. This alone shows, that I think it is a very good program. > > From time to time there is the "85 degree" discussion. It is a clear design > flaw of the DS 18xxx

[Owfs-developers] 85 degree reading means error, readout timing, error should be filtered

2017-01-08 Thread Ekkehard Pofahl
Hello, I am using OWFS since more than two years in different versions on a Raspi 2. This alone shows, that I think it is a very good program. >From time to time there is the "85 degree" discussion. It is a clear design flaw of the DS 18xxx chips to sent out a valid temperature reading, when an

Re: [Owfs-developers] 85

2013-07-14 Thread Jan Kandziora
Am 13.07.2013 20:21, schrieb Jerry Scharf: The origin of 85 was that the original sensors were 8 bit and only went to 85c and thus all 1s (FF)was an error. When the extended the range to 125c and the bits extended, the error value was already set and produces the problem you have. Hind

Re: [Owfs-developers] 85

2013-07-14 Thread Jan Kandziora
Am 14.07.2013 13:10, schrieb Jan Kandziora: I see currently owfs is unable to update the scrachpad RAM only, as it would be neccessary to implement such a scheme. Paul, what do you think about having a node which does the Write Scratchpad command, but leaves out the Copy scratchpad command?

[Owfs-developers] 85

2013-07-13 Thread Daniel MacKay
I notice my DS18S20 and DS18B20 sensors, if there's a network failure or.. perhaps a hardware failure from overheating the sensor when I'm soldering wires onto the leads, reports 85 as the temperature. As far as I can tell the crc8 value is correct in these instances. a) why does it do this?

Re: [Owfs-developers] 85

2013-07-13 Thread Gregg Levine
On Sat, Jul 13, 2013 at 11:11 AM, Daniel MacKay dan...@bonmot.ca wrote: I notice my DS18S20 and DS18B20 sensors, if there's a network failure or.. perhaps a hardware failure from overheating the sensor when I'm soldering wires onto the leads, reports 85 as the temperature. As far as I can

Re: [Owfs-developers] 85

2013-07-13 Thread Daniel MacKay
Gregg: How are they being powered? What sort of wiring method are you using? They're on three wires, Linear style: http://www.maximintegrated.com/images/appnotes/148/148Fig01.gif being driven by a SheepWalk RPI2 http://www.sheepwalkelectronics.co.uk/RPI2.shtml

Re: [Owfs-developers] 85

2013-07-13 Thread Daniel MacKay
Gregg: The three wires are: 1) Power, +5v 2) Ground 3) Data On 2013-07-13, at 13:00 , Eloy Paris pe...@chapus.net wrote: On 07/13/2013 11:22 AM, Daniel MacKay wrote: Gregg: How are they being powered? What sort of wiring method are you using? They're on three wires, Linear style:

Re: [Owfs-developers] 85

2013-07-13 Thread Gregg Levine
On Sat, Jul 13, 2013 at 12:05 PM, Daniel MacKay dan...@bonmot.ca wrote: Gregg: The three wires are: 1) Power, +5v 2) Ground 3) Data On 2013-07-13, at 13:00 , Eloy Paris pe...@chapus.net wrote: On 07/13/2013 11:22 AM, Daniel MacKay wrote: Gregg: How are they being powered? What sort

Re: [Owfs-developers] 85

2013-07-13 Thread Jerry Scharf
Daniel, The origin of 85 was that the original sensors were 8 bit and only went to 85c and thus all 1s (FF)was an error. When the extended the range to 125c and the bits extended, the error value was already set and produces the problem you have. Hind sight says they should have used the

Re: [Owfs-developers] 85

2013-07-13 Thread Daniel MacKay
Wow Jerry, what a comprehensive and coherent answer. Thank you so much. I think I'll take your strategy of just discarding all 85.000 values - at the data collection point I'll turn them into a U undef which will propagate up in the software to a missing value. -dan

[Owfs-developers] 85°C-Problem with DS18S20

2007-02-06 Thread Chris
First thing is... I am using owfs 2.6p1 in linux. I have a ds9097u-adaptor and built myself a small hub based on three ds2409. It works well and I can connect an LCD and it just works. And now the problem: When I connect a ds18s20 to the hub it always reads 85°C :( But it works great when I

Re: [Owfs-developers] 85°C-Problem with DS18S20

2007-02-06 Thread Paul Alfille
I can't test a DS2409 until next week. You know the VDD (on the DS18S20) should be powered, or grounded, not allowed to float free. I wonder if there isn't a problem with power for conversion using a DS2409 hub. It will take some experimentation. Paul Alfille On 2/6/07, Chris [EMAIL

Re: [Owfs-developers] 85°C-Problem with DS18S20

2007-02-06 Thread Chris
Ah, I forgot to say, it works with digitemp in linux and with 1wire-viewer in windows, also with not-connected VDD-Pin on the DS18s20. Paul Alfille wrote: I can't test a DS2409 until next week. You know the VDD (on the DS18S20) should be powered, or grounded, not allowed to float free. I