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1  Using Arduino / Sensors / Re: 1 wire temp sensors on: January 31, 2011, 07:02:44 am
no problem...thanks very much

Troy
2  Using Arduino / Sensors / Re: 1 wire temp sensors on: January 30, 2011, 08:58:39 pm
Well, i pulled my buss apart and tested each 1 wire separately.... one of the 4was bad..... put it all back together with a new to replace the bad.... and it works....

What I would like to do is figure out how to run the units in non parasitic power.... i think i may be pushing the limits of parasitic mode.

if you have any links that show pictures or schematics i would appreciate it.... tried to connect in what i thought was logical way with a 5v wall wart.... but did not work.

Thanks

Troy
3  Using Arduino / Sensors / Re: 1 wire temp sensors on: January 28, 2011, 07:39:09 pm
thanks for the help but .... I am not sure what this means..... I think I should change from parasitic to non parasitic but how..... I have a 1 amp 5 volt wall wart.... so do i just wire it into the v and neg part of the buss with a resistor between the signal wire and the 5v wire (at both ends)?   I really want to learn this stuff as well(helps me tackle other problems down the road) any links that may help? 

again any help you can lend is appreciated as I am sorta stuck.... multiple searches have not come up with much about non parasitic power for 1 wire.

Thanks

Troy
4  Using Arduino / Sensors / Re: 1 wire temp sensors on: January 28, 2011, 11:09:56 am
yes I saw a great deal about the stability issues in the forums but figured if it was working let it keep working.  How would I add for a powered setup.... really cant find any pictures or schematics for non parasitic.

do I just add a 5 v power supply to the ground and +5v with a 4.7k (some say smaller with long lengths like1.0k) resister between +5v and signal (is this on every sensor or just at the bus?).  I tried that with my spare 1 wires but could not get it to work.

Thanks

Troy
5  Using Arduino / Sensors / Re: 1 wire temp sensors on: January 27, 2011, 07:45:27 pm
Rusty thanks for replying....
the 4 - 1 wire temp sensors are in parasitic power.....
a short makes since as I have not changed any of the programming and they were working for several weeks.

I am new to electronics and don't have a lot of experiance troubleshooting this.... what would be a good next step?

Thanks

Troy

6  Using Arduino / Sensors / Re: 1 wire temp sensors on: January 27, 2011, 04:03:29 pm
hello thanks for the reply,
pulled the bus wire and the output changed to 32deg f  (0c).... I cannot find any math altering the data for temp other than that from the library.   Also this was working O( no changes to software in weeks)

interesting that it changed from -196 to 32 by unhooking the data wire to the bus???

Thanks
Troy
7  Using Arduino / Sensors / 1 wire temp sensors on: January 27, 2011, 01:04:37 pm
Hello all,

Working on my greenhouse controller with 4 1 wire temp sensors in parasitic power.  All were working for several weeks and a few days ago all of the sensors show -196 deg F.  Is this a common sysmptom.  I have them all on the same bus wires with the longest run about 35 feet from the arduino.  Using a 4.7k ohm pullup resistor.

Any Ideas

Thanks

Troy Pearce
8  Forum 2005-2010 (read only) / Interfacing / Re: timer functions on: November 24, 2010, 10:33:49 am
Thanks Korman and AlphaBeta.... both of your methods seem a whole lot more elegant than the way I am currently doing it.....

and Alpha...... that method seem very simple indeed..... Seems very familular from long ago programming in Fortran.... but the mind..... I just could not remember it.

Thanks again and will look into both methods not sure which one but both are better than how i am doing it.....

Thanks again
Troy
9  Forum 2005-2010 (read only) / Interfacing / timer functions on: November 24, 2010, 01:39:05 am
hello all,

using an arduino as an aquaponics greenhouse controller.  One of the most important tasks assigned to the arduino is as a reoccuring timer.  
The recirculation pump pumps to the growbeds from the fish tanks every 20 min for 4 min.  I am afraid that the method I am using is not very elegant as I am using my rtc to give me time which i convert to time in min and then have an array of 45 start times 20 min appart.  I would guess that there is a better way.... have read of a few different libraries and just figured I would put it out there as a question.

Thanks

Troy Pearce
10  Forum 2005-2010 (read only) / Interfacing / Re: dallas 1 wire temp sensors on: November 16, 2010, 12:48:23 pm
Thanks.... will try the led at the end of the line.... and I will post my code when i get to my laptop.   If moisture is an issue should I be using a diffferent sensor..... thermistors?

Thanks for the replies

Troy
11  Forum 2005-2010 (read only) / Interfacing / dallas 1 wire temp sensors on: November 16, 2010, 11:24:42 am
hello,

I am running an arduino with 3- 1 wire sensors in my green house.... they have been working great for months.... and now they are all reading 32 deg F with no change when heated...... looked for loose connections etc but not sure what to do next..... any Ideas

Thanks

Troy
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