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2011 in review January 1, 2012

Posted by rik94566 in Uncategorized.

The WordPress.com stats helper monkeys prepared a 2011 annual report for this blog.

Here’s an excerpt:

A New York City subway train holds 1,200 people. This blog was viewed about 6,500 times in 2011. If it were a NYC subway train, it would take about 5 trips to carry that many people.

Click here to see the complete report.



1. richard - January 9, 2012


Reviewed your posting on dallas ds temp sensors.

I had successfully harnessed 13 sensors for installation on marine diesel engine and 4 bank batteries (ultimately for use in smart charger setup). Prior to doing extensive work on field instal, I checked sensors at higher temps needed (to 135deg limit). All sensors failed to read over about 112deg and even tho on separate regulated power supply, it became impossible to get my laptop to not read as if on parasitic mode.
In you instalation it is not clear how you used the pullup reistor – did you send the 5v down to each unit and install a pullup on each sensor, or simply per the literature – one resistor for whole network?
I have received replacement sensors but before doing the harnesssing I am trying to find anyone who has tried work-arounds that could improve reliabilty.
Richard Biurgoyne
Nanaimo, BC

rik94566 - January 11, 2012

richard —
in some of the research I have had to do on these sensors the high temps you have should not be a problem. If I can find the source I will send or post here for others to learn from. Welcome to the wonderful world of DA18B20’s. As you point out everyone talks about the specs of the DS18B20’s, but I have found very few that really work with them and they only talk about the details of how they should perform, not much actual experience with making them work. Now on to your question about the pull-up resistor. I am not using a laptop to get my temp readings, so I don’t know how that works. I am using an arduino and the arduino sketches are read on the serial port of my computer in a standard configuration. At the present time I have not finished the documentation of this external power part, but I have done the work and everything is working now. I have not tried the single resister with all sensors running off of it. The work I have completed is using a 4.7K ohm resistor on the harness with the resistor running from power (red wire) to signal (yellow wire) as in the 3 -wire configuration I talked about in earlier blog posts. With the use of an external power source the red wire (+) comes from the 5V wall supply. The yellow wires (signal) are joined and run to PIN 8 on my arduino and read there. All ground wires are connected to the black (-) wire from the wall supply. The problem that I had to start with was I did not ground (black (-) wire) back to the arduino and I got no results, nothing but a blank screen. Once I connected my black (-) ground wire from my arduino into the black (-) wall supply and all the sensor black (-) wires everything worked fine. In what I have done so far I have seen no difference using the 4.7K ohm resistors vs the 2.2K ohm resistors all connected in the same configurations. I read about the resistor difference, but again have not been able to find any work where they have been hooked up. There is also talk about the use of 1.0K ohm resistor, but I have not had to go there as yet as all my stuff is working just fine. Hope this helps. rik

2. Glayds la stent - January 12, 2012

Nice, I bookmarked this page on Digg under “2011 in review Aquaponic DIY Automation Blog”. So hopefully our friends can give you a visit. Keep up the good stuff.

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