Hi Olewolf

[hallard]

Thank you for sharing this lib, nice job.

I think there is a problem with the configuration_high_threshold and configuration_low_threshold, when you set a value to one of this registers, reading it back is not the value you set. As the value is 15 bits but left aligned, I think the method to set it should be more like this one (<<1 before setting the value)

void MAX31865_RTD::reconfigure( )
{
  uint16_t threshold ;
  /* Write the configuration to the MAX31865. */
  digitalWrite( this->cs_pin, LOW );
  SPI.transfer( 0x80 );
  SPI.transfer( this->configuration_control_bits );
  digitalWrite( this->cs_pin, HIGH );

  /* Write the threshold values. */
  digitalWrite( this->cs_pin, LOW );
  SPI.transfer( 0x83 );
  threshold = this->configuration_high_threshold << 1;
  SPI.transfer( ( threshold >> 8 ) & 0x00ff );
  SPI.transfer(   threshold        & 0x00ff );
  threshold = this->configuration_low_threshold << 1;
  SPI.transfer( ( threshold >> 8 ) & 0x00ff );
  SPI.transfer(   threshold        & 0x00ff );
  digitalWrite( this->cs_pin, HIGH );

}

Anyway, even with this fix it does not seem to work, I tested with PT1000 config with and without this PT1000 connected, I'm in the range when PT1000 is connected, and as soon I disconnect, I'm out of range, but status does not indicated a High threshold. Very strange. But it's by the end of the night here, so I need to take a rest, may be tomorrow I will see where's the problem ;-)