Max31855 with the propeller?

TylerSkyler

Hey All! I'm looking to read temp with this. It uses a Max31855 and k-type thermocouple. I treied the object for the 6675, but it isn't pin compatible. How could I read this sensor? Any help is Appreciated.

Thanks,

Tyler

SRLM

This is a case where you'll have to read the datasheet. If you look there, you see that this sensor is interfaced to with SPI. Next, you'll need to find an SPI object to use on the Propeller. Alternatively, you can create your own routine for reading the 32 bits from the device. Something like this (untested):

PUB ReadSensor : data
   
   outa[CS_PIN]~ 'Set CS low
   
   waitcnt(t_css + cnt)
   
   data := 0

   repeat 32
      outa[SCK_PIN]~~
      data := ( data << 1)  | ina[SO_PIN]
      waitcnt(t_ch + cnt)
      outa[SCK_PIN]~
      waitcnt(t_cl + cnt)

   outa[CS_PIN]~~

   return data

The datasheet provides timing examples.

TylerSkyler

Hey, Thanks for the reply I haven't gotten it to work yet, but i'm on the case. Any more info is most apprciated...I'm a little slow only a little

Thanks,

Tyler

SRLM

Hi Tyler, I've order some of these chips for my own project. So, if you're willing to wait a few weeks then I'll have some tested code that I can post up.

JonnyMac

That chip is easy to use -- my object is attached.

TylerSkyler

JonnyMac wrote: »

That chip is easy to use -- my object is attached.

Thanks I'll try it out when I get a chance.

Thanks,

Tyler

knikula

JonnyMac, thanks for posting this, Tyler, thanks for asking...I'm trying this chip out at the moment...

Ken....