Author Topic: Add a max6675 to a MCmodule 110  (Read 187 times)

mr_mcthing

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Add a max6675 to a MCmodule 110
« on: January 21, 2017, 08:57:15 am »
Hi, would it be possible to connect a max6675 thermocouple to a Mcmodule 110? And how would that be achieved best? Any ideas on this?

Thanks.

W.

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Nick_W

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Re: Add a max6675 to a MCmodule 110
« Reply #1 on: January 21, 2017, 07:52:18 pm »
You could, I'm not sure exactly why you would want to, unless you need some special feature of the digital interface.

You would have to implement an SPI interface, which is supported, but with no real examples published. Doable though.

An easier (and cheaper) alternative would be to connect an analog k type thermocouple amplifier. Like this one:

https://www.adafruit.com/product/1778

Then you just need an analog input pin, and the interface is easy.

What is the temperature range you are reading? Do you need high temperatures (in the 1000 degrees range)?

mr_mcthing

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Re: Add a max6675 to a MCmodule 110
« Reply #2 on: January 23, 2017, 03:31:43 am »
Thanks for the reply. I want to read the temperature of a Woodfired oven. Temperatures can get as high as 600 c or even more. The module you referred to mentions a probe for higher temperatures (but needs 5 volt)temperature. Would it be possible to use a step-up regulator?


Nick_W

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Re: Add a max6675 to a MCmodule 110
« Reply #3 on: January 23, 2017, 05:17:24 am »
Not without a lot of messing around (which was why I asked about the high temperature requirement).

Easiest would be to power everything from 3.3 V (or thereabouts) the modules can go up to 3.6V max, so you could run everything from a standard 3.3V supply/battery set up.

I haven't tried an SPI interface on a module, but I have implemented one on a cortex M1 before, and it wasn't hard (they have all the support built in).

I also interfaced an external break-out board to a module via I2C and had no real difficulties - if the SPI interface is as easy, then that may be the way to go.

You would be breaking new ground though, so be sure to let us know how you get on!
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