# MKR1000 and MAX31855K don't play nice with each other

**URL:** <https://community.sparkfun.com/t/mkr1000-and-max31855k-dont-play-nice-with-each-other/36902>\
**Category:** Arduino\
**Created:** [May 19, 2019, 5:51am UTC](https://community.sparkfun.com/t/mkr1000-and-max31855k-dont-play-nice-with-each-other/36902 "2019-05-19T05:51:30Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![mbeddo](https://avatars.discourse-cdn.com/v4/letter/m/71c47a/32.png) [@mbeddo](https://community.sparkfun.com/u/mbeddo)\
**Post date:** [May 19, 2019, 5:51am UTC](https://community.sparkfun.com/t/mkr1000-and-max31855k-dont-play-nice-with-each-other/36902/1 "2019-05-19T05:51:30Z")

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I got the thermocouple breakout MAX31855K to work with my Arduino Pro Mini, following the tutorial at [https://learn.sparkfun.com/tutorials/ma … okup-guide](https://learn.sparkfun.com/tutorials/max31855k-thermocouple-breakout-hookup-guide).

I thought I’d try the same with my Arduino MKR1000. I’m noticing that as soon as I upload the sample sketch (SparkFun\_MAX31855K\_Thermocouple\_Breakout.ino) the MKR1000 becomes unresponsive, and no longer known to the computer. I have to double press the reset button before the computer sees the board again.

This is how I hooked up the MAX31855K to the MKR1000:

MAX31855K → MKR1000

* * *

!CS → pin 6

NC → I didn’t connect

SO → pin 10

SCK → pin 9

VCC → VCC

GND → GND

[attachment=0]IMG\_1743\_2.JPG[/attachment]

I modified line 33 of the sketch to make the CHIP\_SELECT\_PIN = 6, and I commented line 45 and uncommented line 52 (I wanted to see some debugging info).

As soon as I upload the sketch, the board disappears from device manager (Windows 10). Unplugging/plugging USB cable doesn’t help. I have to double press the reset button.

I’ve tried moving SS to different digital pins but that doesn’t help. Do I have the pin assignments correct?

I tried searching for help, I found one link on Google that suggested the SPI library doesn’t play nice with MKR1000 + MAX31855K, but when they rewrote the digital read functions themselves it worked. They didn’t provide any details so I don’t know what they mean by rewritting the digital read functions.

 ![IMG_1743_2.JPG](https://canada1.discourse-cdn.com/sparkfun/original/3X/c/8/c817c03b867fe897f7218fe738f1968c0bcca687.jpeg)

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<div class="post-metadata">

**Author:** ![mbeddo](https://avatars.discourse-cdn.com/v4/letter/m/71c47a/32.png) [@mbeddo](https://community.sparkfun.com/u/mbeddo)\
**Post date:** [May 19, 2019, 8:09pm UTC](https://community.sparkfun.com/t/mkr1000-and-max31855k-dont-play-nice-with-each-other/36902/2 "2019-05-19T20:09:50Z")

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I found that if I commented out the “SPI.begin()” in the SparkFunMAX31855k constructor (line 48) and called SPI.begin() in my setup() function, everything seems to work now.