MAX31865 RTD Converter and PT100 Probe Options

Read a compatible platinum RTD from a microcontroller project using a MAX31865 conversion board with an SPI interface.

✅ Bring an RTD into the digital project - The converter turns the sensor resistance into a reading the host can process.

✅ Use the sensor's wiring arrangement - Support for two-, three- and four-wire connections accommodates the matching RTD configuration.

✅ Build a tidy sensor connection - Terminal blocks and header connections provide the described board-integration points.

Connect temperature sensing to the controller

An RTD changes resistance with temperature, but a controller needs an appropriate interface to read that change. The MAX31865 board provides that conversion stage and communicates with the project over SPI.

Select the actual board or probe option carefully. The board's reference resistor must match the RTD type; the described 430-ohm arrangement is for a suitable PT100 configuration, not an automatic match to every PT1000 probe.

Technical details

• Board: GY-MAX31865
• Interface: SPI
• Sensor wiring: two, three or four wires
• Reference resistor described: 430 ohms
• Selections: MAX31865 board or PT100 item
• Sensor and board contents depend on the selected option

Build an RTD reading into your next correctly matched temperature project.