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Joined: 21 January 2012
Location: Australia
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Posts: 555
Posted: 17 April 2018 at 11:01pm | IP Logged Quote chronic

Now I see why you cut the ground connection, the 31855 doc says
expressly to not connect the thermocouple to ground, the 6675 schematic
and pcb has it deliberately connected !
Weird - looks like they stuck the 31855 ic on a pcb designed for
the 6675. Commiserations Mik.

Edited by chronic on 17 April 2018 at 11:02pm

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Joined: 20 June 2011
Location: Australia
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Posts: 2012
Posted: 18 April 2018 at 6:56am | IP Logged Quote bigmik

Hi All,

I played a little more before we had to go out to watch “Priscilla Queen of the Desert” (Great show by the way, WE had front row seats)..

If I change the SPI mode from mode 2 to mode 0,1 or 3, the readings (at room temperature only tested) were within 1.5degrees..

I used a cheapa$$ electronic thermometer that showed my room was 19.3C (making the original code 9C low.. way too far out..) with either of the other 3 modes it returned 21 +- 0.5C.

I will need to throw my head into the spec sheet to work out which mode should be best for the MAX6675.



Mick's uMite Stuff can be found HERE

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