Hardware & acquisition

rtd-acquire sits between hardware-specific measurement systems and RTD-model interpretation.

The first implemented converter path is the Analog Devices MAX31865, reached through an injected SPI transport/HAL. On Raspberry Pi, the Python host adapter uses the standard Linux spidev userspace interface. rtd-acquire 0.2.0 also adds the portable C11 MAX31865 path and an Arduino AVR / UNO-class adapter for the inventr.io HERO.

The project is intentionally broader than one converter. Future acquisition families can include precision ADC/front ends, industrial resistance inputs, transmitters, and digital industrial interfaces while preserving the same high-level measurement boundary.

Boundary clarification introduced in: rtd-acquire 0.3.0

rtd-acquire is one route to resistance, not a required hop for every physical RTD. If another instrument or interface already provides the desired RTD-element resistance in ohms, it can feed rtd-sensor directly. Devices that expose only internally calculated temperature are outside the core rtd-acquire resistance-backend contract.

Continue with:

• MAX31865
• Raspberry Pi / Linux SPI
• Arduino AVR / HERO adapter
• The acquisition boundary
• Compatibility matrix