DS18B20 Temp Sensor Issues

Glad you got it working, I have have used those sensors with a serial port on a pc but not yet on a pi. I was quite impressed with them when I used them. I linked three of them to the serial port to log the temperature of my fridge, freezer and room.

Franlk: do you have the serial port coding for that, or is coding needed?

Do you have to hand select the IP address of each sensor, or are they picked up automatically?

I use them with Arduino MEGA with data logging shield and RTC. Still trying to work out my ability (nil) on MatLab to combine the existing date and time columns into one datetime column. It is a pain, I think. MatLab (or something like it) is my best option since working over 100,000 rows in Excel gets too tedious for me (or most anyone else).

BTW I have at least one data file with over 300,000 rows, and expect to go well over 1,000,000 at some point in a single run. Multiply that by several data loggers running on one overall experiment, and then lacing the data together in real time frame, and you can see my challenge.

OK, I am feeling somewhat teachable, so please fill me in with what you like the best.

It is like this:

Date:______________, Time:___________, (column headers) data, data, data, etc.,

May 23, 2017, 13:33:22, 0,0,0, 13.2, 8.3, 28.3, 85.2, 10,

(next row x 333,000)

I would like to see in Matlab (or Python or NumPy), the following:

May 23, 2017 13:33:22, 0, 0, 0, 13.2, 8.3, 28.3, 85.2, 10,

(next 332,999 rows.)

Of course, I could always go back the coding in the Arduino data loggers, and change the way date time is recorded, so that it is all in one field (column). At least on the ones where I wrote the code, but a colleague of mine might have to update one of the loggers. Oh snap, I have the source code for that one too! That should make life just that much easier as far as getting things to plot.

It has been a while since I did this, I think it was 2014 or before but I had a blog I was going to write up on it but never got around to finishing it. I think this is the page that I used for the serial interface and software. I used the schematic for the parasitic mode and my circuit was just built on a bread board. If I recall the three sensors just showed up in a list with different addresses listed next to them. I did this in windows xp at the time so I probably used the software listed for windows in the link. I was only taking readings every 15 seconds as that was more than enough for a fridge. I do remember the neat thing was seeing the saw tooth cycle of the fridge cooling and warming up and then the defrost cycle ever couple of days. You could even see the same cycle in the room temperature sensor as the fridge heated the room it was in.

Thank you kindly, that should be interesting to look at, and maybe we can utilize some older computers that will not support newer versions of Ardunio lingo.