MAX31685 Interface on myRIO

[David15]

Hello I'm trying to interface a MAX31865(https://learn.adafruit.com/adafruit-max31865-rtd-pt100-amplifier/pinouts) board to myRIO board, in order to acquire an RTD 4 wire, but I cant able to read nothing.

Can someone help me with connections and code?Find attache what I have done in terms of connections and code.

Regards

David

[David15]

hi guys,
I worked on the SDI interface for the MAX31865 and I understand that before read data I need to set properly the configuration register(see pag. 13 of datasheet) so i modified my code to set the configuration register but I'n ot stilll able to read temperature.
I really need help.
The data sheet is below. The SPI details are on page 5 and I'm using the 4-wire connection. I also will attach what I have so far.

Many thanks

[Nemesis]

Hi, Did you manage finally the project? I am interested in how it went out.

[David15]

Hi,

Finally I found the solution,I'll post everithing in the next day.

[Nemesis]

Great, It would be very helpful. Could you put as well a vi file compatible with version Labview 15 or print screen of your project, please?

[Nemesis]

Can you attach the project pls?

[David15 · Accepted solution]

Dear Nemesis,

find attached the VI to read PT100 4 wire whit MAX31865, you have to  work at 1-shot mode, at this mode, you must set D5 bit in configuration register to start a conversion following the steps below:

-Put the CS high.

-Put the CS Low.
-Set configuration register with A0h
-Put the CS high.
- wait  66ms or more.
-Put the CS low.
-Read the first register with RTD data at the address 01h,
-Read the firs register whit RTD data at the addrees 02h
-Put the CS high.
-Loop this operation.

ciao

David

[Nemesis]

Thank you for your answer. However, Can you save it for the version of LabVIEW 15 or make a print screen, please? Thanks

[David15]

Attached the print screen of vi

ciao

David

[Nemesis]

Thanks a lot.