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#40309 Data format on SD Card

Posted by jimox on 27 November 2012 - 02:28 PM in General Discussion

Welcome to the forums! I personally would store it as JSON. Since you already plan on having code to do the JSON serialization I don't see any point in using up more space for XML serialization or CSV parsing. In addition JSON is more compact than XML so it will use less space in your log file. The only benefit I see for CSV would be an even further reduced storage size but since you said overall it won't be that large then I would think the benefits of JSON would outweigh that. As for remotely connecting to the netduino to view the file. I don't see how you could do this without at minimum setting up a service to listen for requests to view the file. However if you have the code space it is pretty easy to spawn a thread to listen for requests on a port and respond.

#38709 Something new is brewing in the Secret Labs

Posted by jimox on 08 November 2012 - 06:15 AM in General Discussion

Seriously, I just bought a new one 4 days ago!

#35117 Are we going to see an updated n & n+

Posted by jimox on 13 September 2012 - 01:13 PM in General Discussion

Chris, Looking back at my original post under-powered might not have been the correct term to use. Under spec'd would have been more accurate. In my case I am mainly concerned with code space. I am running OneWire (so I can't bump up to v4.2) on an n+ using networking so I have limited space. The possibility of an out of memory exception on a board controlling power to 120v hardware has me a bit concerned.

#35074 Are we going to see an updated n & n+

Posted by jimox on 12 September 2012 - 08:49 PM in General Discussion

Just wondering as I am planning out my future projects are we going to see a hardware refresh to the base netduino and netduino plus? It seems that after the launch of the go they are starting to look a little under-powered.

#34964 OneWire ALPHA

Posted by jimox on 10 September 2012 - 03:13 PM in Beta Firmware and Drivers

Is there an update on when we will see OneWire baked into 4.2?

#34747 Homebrew fermentation temperature controller

Posted by jimox on 06 September 2012 - 02:07 PM in General Discussion

Since I havent tried the ssr yet, I was hoping it was dead simple, it have same input and output as an relay, but it is optically isolated, and you don't get trouble for coil induction etc, and it have proper screw terminals which is good for the high voltage and currents, the printboard is probably ok, but as they write, solder the wire instead of using the wire terminals, since those that comes with it is not rated for this current.

the complete controller I use already have an probe with it, cheap&complete (they have models for us market and so on also, The things I refer to are 220volt since I live in Norway)

For the other project i have various probes, i havent found witch to use yet, but I bought this and would guess it should be ok for lower temps, for boiler I think I will look at this: , but I need to find out if it is food safe first.

This project is of good use to find ideas for good sensors, how to attach them and so on, but probly overkill for your keezer/fermentation fridge.

I guess you know this, but make sure that you do control your freezer/fridge properly, when switching the compressor on and off, you need to give it time to rest between each time, or otherwise you will soon have an heavy boat anchor..

I looked at your probe for the boiler and I expect it will be food safe. The cable is PTFE (teflon) which according to http://www.homebrewt...on-tape-231217/ is food safe. The only thing you should check on before you go with it is what they use to seal the ss tube to the wire and make sure it is food safe.

I am planning on programming a minimum delay between switching the relays to prevent premature wear. I am thinking of setting it at 10 minutes.

#34743 Homebrew fermentation temperature controller

Posted by jimox on 06 September 2012 - 12:57 PM in General Discussion

just remove the last dot in the url: https://www.sparkfun.../products/11042
I'm using this for controlling my fridge, and are preparing another one for an chest freezer.

In an similar project I'm toying with (controlling boiler), I'm going to use an solid state relay:
I hope it will work, at least it seems much simpler and safer than an coil based relay, and with that price.. :)

I thought about going with an SSR but I wanted something dead simple (a kit) to start with and the SSR kit at sparkfun doesn't have a high enough amperage. If all works well I will make one for my keezer also. What did you use for your temperature probe?

#34742 Homebrew fermentation temperature controller

Posted by jimox on 06 September 2012 - 12:53 PM in General Discussion

jimox, the link you provided issues a 404 page not found web error. However I would like to add that I would be very interested, in what you come up with. We're 100% off-grid here, using solar to charge our batteries . . . and run a chest freezer off our inverter. Have been considering doing something like this myself, but for the purpose of shutting off the AC outlet at the freezer when battery voltage gets too low.

I have fixed the link. After doing some research (and after the reply from neslekkim) I think I will try using them. If I can find the time I will breadboard it out this weekend and give it a try. I'll let you know how it goes.

#34681 Homebrew fermentation temperature controller

Posted by jimox on 05 September 2012 - 02:31 PM in General Discussion

Ok, I just found these https://www.sparkfun.../products/11042. I know that my freezer pulls 12A on start-up so I would need to solder directly to the board on the load side. Does anyone see any issues with using these?

#34654 Homebrew fermentation temperature controller

Posted by jimox on 04 September 2012 - 04:50 PM in General Discussion

I am starting a project to control fermentation temperatures inside of a chest freezer. I know we have a lot of homebrewers who use the netduino and was wondering if anyone would be willing to share what they have done already. At the moment I am thinking of going with a DS18B20 https://www.sparkfun.../products/11050 one wire temperature probe (yes I know it will require using the beta http://forums.netdui...-onewire-alpha/ firmware). What I am still having trouble with is deciding on the relays to control the freezer. This is really where I am mostly looking for input. I am in the US so the relays will need to be able to control a 120VAC outlet which the freezer will plug into (I also have a heating element that I will ultimately be controlling also). If anyone out there has any suggestions or better yet some code/pics/wiring diagrams that would be greatly appreciated. Thanks.

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