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Raspberry Pi w/ Roasting?
I bought a Raspberry Pi to explore the potential of using it to log my roasts, but wondering if anyone else has already tried this. What worked? What didn't? Suggestions in going about it?

I'm roasting with a behmor 1600 and am trying figure out how the best way to log temps, etc without doing anything to void my warranty. Thanks!
I have tried this and it works with the RoastLogger software and the TC4. Java (JRE 1.8) must be installed and a RXTX driver also for the USB port. It runs from the command line.

The standard Raspberry PI "wheezy" version of LInux was used. It does run and will log a roast and keep up, but probably not do much more without bogging down. I have not tried to add roast control to see.

I was looking into changing the memory allocation to give the application more and the graphics less to try.

I have some photos of the setup if you are interested. It has a 7" display and a mini keyboard/mouse pad with it. My plan was to have a small embedded system that just logs roasts.

Edited by JackH on 10/07/2013 6:28 AM

KKTO Roaster.
Thanks Jack! Photos would be stellar! I've thought about dedicating this just logging roasts, but there's so much you can do with a Pi...

I've been using the Roastmaster App on my iPad too.
Here are some photos of the setup. You can see the mini keyboard and the small monitor. I did log a roast and it will keep up nicely. Not bad for a $35 computer board.

It is connected to the TC4 board here but I had no thermocouples connected for the photo. You need the ARM version of Java JDK 1.8 and librxtx-java installed too.

It is running the Linux version of RoastLogger.

JackH attached the following images:
pi_screen_ii.jpg pi_screen.jpg pi_system.jpg


KKTO Roaster.
Hey, Ive been looking into the same thing. but without TC4/arduino

I want to attempt to keep it as close to the TC4 as possible, and was looking at using MCP3424 + MCP9800 chips.
However I cannot figure out which would be better:

voltage divider:


or no voltage divider:

maybe someone that helps design the TC4 board can help?
The voltage divider version is not needed for thermocouple inputs. It is to allow input signals levels from 0V to 5V.

Your second link (no voltage divider) would be better for thermocouple inputs.

Please let us know how this works for you. It looks like an interesting board for the Pi.

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