Temperature Monitoring

[solarbot]

@ daftlad - the flat panels were chosen over tubes for their greater robustness/reliability.... public area :-)

@ dhaslam - we will be using the pool as a thermal store - heating to 31c when we can.  The collected data showed a 0.5c drop in temperature in cool/cloudy conditions and the boiler set point is 28c so we should get a 6 day period of grace before the boiler starts picking up the load.  The unglazed panels only work in direct sunlight (when we don't need it) and are capable of raising the pool temperature to about 5C above ambient.... so we couldn't use the pool as a buffer.  I'm sure the unglazed panels would work OK in an unheated pool - as soon as there is a boiler involved it seems to be the wrong choice.  By simulation the 26 panel array will knock 60% off the gas consumption - my hunch is that it will out perform this...... when it's up and running the data loggers will go on again for the new picture :-) 

[Brandon]

greenbeast, the code you link to has been lost in the ether, and as such I was wondering if you could either post it here, or PM me with it.

Thanks  Brandon.

[Greenbeast]

erm yes will do.
let me get my brain in gear

[Greenbeast]

right, the original link should work again now.

Thanks

[tony.]

At work we use these usb temperature data loggers from RS.

can sample from varying times, from 1 sec 1 min etc,  we use 1 min, which  think gives 3 weeks of info.

http://uk.rs-online.com/web/search/searchBrowseAction.html?method=getProduct&R=4666115

The one I am looking at in my hand is 666-8160  this has an external k type socket on the back of it and comes complete with a thermocouple and a lithium battery

good software with an easy temp page display with data able to export to excel.

tony

[StBarnabas]

The hardware used for this project is:
....

Open the development environment and import the new libraries, open the code example and upload it to the arduino.
It should reset and run automatically

I’ll try and answer any questions i can!

Hi GreenBeast
As you will be aware I am trying to add a Nokia display on top of Eric's 1-wire LogBee. But I can not get the code to compile. I went back to basics and have downloaded your example again, But no success. What is annoying is that when I set it up on Desp's machine there were no issues, but Desp's machine is now in Cactusville obviously.

I can see no obvious errors but maybe I am missing something. The correct version of the library seems to be there and is seen but still get errors. I may give the Arduino Forum a go if all else failse.

 

 

[Greenbeast]

Have you definitely got the latest library from here:
http://blog.thiseldo.co.uk/?paged=2

I'm no expert unfortunately

[solarbot]

Hi StBarnabas,

I have had this problem before - in my case it was caused by installing the library but not restarting the Arduino IDE so that it knew it was there... might not be this but worth a mention I guess.

Also, I have been using this setup: http://www.airsensor.co.uk/component/zoo/item/temperature-humidity-logger.html with an LCD such as: http://www.byvac.com/bv3/index.php?route=product/product&path=35_36&product_id=57 - pretty easy to implement.

[StBarnabas]

Thanks
GreenBeast and SolarBot. I indeed was using the wrong version of the library. I downloaded both Andy's version and the original one from Nulectronics. It would be nice if there were some version control. No eed for anything posh - just putting a number or a slight rename would be sufficient. In general I like the Arduino but the library handling needs upgrading. This now works fine.

I am getting a interesting effect with Eric's DS2405 HalfBee clone. I have only three OneWire addresses and the third one seems to be assigned to the switch. I get an alternating 0,-1,0 and -1,0,-1 pattern.

Sean     

[ericw]

Sean,
The DS2405 has a rather strange method of setting the output state, it should actually toggle everytime that you have a match in Match ROM.
Data sheet is here http://datasheets.maxim-ic.com/en/ds/DS2405.pdf

Have you added code to read the state of the DS2405 or are you not reading it but displaying spurious data in the display 'slot'.

The DS2413 (Dual) outputs are set by writing a data byte to the chip, so it would seem to be more convenient for driving outputs to create a HalfBee for this device. I only really did the 2405 to test LogTemps alarm function.

[StBarnabas]

Eric
I am using the 1-wire libraries provided. The switch is definitely toggling. There are 5 sensors defined but only 3 on the board. I understand the software will read sensors 1,2,3,3,3 - read the switch 3 times. I have an LED connected to the switch and it flashes on and off. I think it is interpreting false as 0 and true as -1.

Your other point is a very good one. Using an Arduino as a master would enable us to create new 1-wire devices. A controllable PWM generator for example would be very useful.

Sean