If I want to use a rrd graphics display, and a thermocouple,

Controllers Smoothie
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1

If I want to use a rrd graphics display, and a thermocouple, would this be possible?

2

Unfortunately no, that is a limit of the RRD GCD hardware itself, it doesn’t respect the SPI’s “select” pin, so you can’t do it.

3

@Arthur_Wolf can you take a look at my post. And what’s your thoughts on the extruder problem.

Thanks

4

@jacob_keller What post ? I have the flu I’m only now slowly catching up on things.

5

https://plus.google.com/115098820415162360458/posts/92KTFjJJaRa

6

@Arthur_Wolf Why use SPI at all?
Why couldn’t one use a spare ADC pin?

7

@Rien_Stouten I have no idea how you’d go about reading a thermocouple with an ADC, we only support doing that via a SPI port at the moment. If you wanted to add that, it’d require some code ( like was added recently for PT100 sensors )

8

@Arthur_Wolf
Well, not directly, no, but there are thermocouple to voltage converters out there.
At the moment I’m using a AD597 with a ramps board, which is not compatible with 3.3V, but there are others who will work fine with 3.3V.
Found one. https://www.adafruit.com/product/1778

9

Oh, we actually support AD8495, it’s just not documented … https://github.com/Smoothieware/Smoothieware/blob/edge/src/modules/tools/temperaturecontrol/AD8495.cpp
I’m going to try adding that to the documentation right now.

10

@Arthur_Wolf So it wouldn’t be any problem?
Just fill in AD8495 and the correct pin number and it would work? That would be great.

11

@Rien_Stouten I haven’t ever tested it, but the code is there yes. I added the config options to the documentation, but I’m not sure exactly how to wire it.

12

@Arthur_Wolf Well, that can’t be difficult.
You just made my day.