Max31855 with the propeller?

Comments

• SRLM Posts: 5,045

  2012-10-24 20:40 edited 2012-10-24 20:40

  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 Posts: 72

  2012-10-25 14:40 edited 2012-10-25 14:40

  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 Posts: 5,045

  2012-10-26 18:17 edited 2012-10-26 18:17

  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 Posts: 9,563

  2012-10-26 20:31 edited 2012-10-26 20:31

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

  spin

  spin

  jm_max31855.spin

  12K

  jm_max31855.spin 12.4K
• TylerSkyler Posts: 72

  2012-10-27 20:38 edited 2012-10-27 20:38

  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 Posts: 26

  2013-09-02 20:32 edited 2013-09-02 20:32

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