The MAX31865 PT100 to PT1000 RTDtoDigital Converter Board is a compact, SPIbased interface built around the MAX31865 RTDtoDigital Converter. It converts PT100 and PT1000 RTD resistance into a digital value for reliable, realtime monitoring with microcontrollers and data loggers. The board provides coldjunction compensation and supports common 2, 3, and 4wire RTD configurations, delivering robust performance in a variety of environments. Key benefits Accurate digital RTD readings: converts RTD resistance to a digital value with coldjunction compensation for improved accuracy and repeatability. Flexible RTD support: compatible with PT100 and PT1000 sensors and configurable for 2, 3, or 4wire wiring to minimize wiring errors and lead resistance effects. Easy MCU integration: standard SPI interface (MOSI, MISO, SCK, CS) with a straightforward digital data path to microcontrollers and single board computers. 3.3V and 5V operation: designed to run from common logic levels, helping it fit with a wide range of development boards and industrial controllers. Compact and versatile: small form factor ideal for breadboards, enclosures, or compact industrial installations; simple wiring with headerstyle connections. No external RTD drive required: the module provides the RTD excitation internally, simplifying hardware design and wiring. Reliable RTDtodigital conversion: built around a proven RTDtodigital converter, ensuring stable and repeatable measurements for monitoring and control. Key attributes Functionality: RTD to digital conversion for PT100/PT1000 sensors; supports 2, 3, and 4wire configurations; SPI data output. Compatibility: works with PT100 and PT1000 RTD sensors; suitable for 3.3V and 5V logic levels; compatible with common MCUs and development boards such as Arduino, ESP32, and Raspberry Pi. Size and construction: compact PCB module with standard header connections; designed for easy mounting and integration in projects and systems. Performance: digital, lownoise readings with fast update capability suitable for realtime monitoring and data logging. Power and interface: operates from 3.3V or 5V supplies; communicates via SPI for reliable, noiseimmune data transfer. Use cases Industrial temperature monitoring: deploy PT100/PT1000 RTD sensors in process lines and feed digital temperature data to a PLC or microcontroller for control and logging. 3D printing and additively manufactured devices: integrate RTD sensors to monitor heater blocks, beds, or enclosures for precise temperature control and improved print quality. HVAC, climate control, and energy management: use RTD sensors to monitor ambient or duct temperatures and optimize temperature regulation and energy use. Laboratory instrumentation and data logging: connect RTD sensors to data acquisition systems to capture accurate environmental or experimental temperature data over time. Notes This module is based on the MAX31865 RTDtoDigital Converter and is intended for PT100/PT1000 RTD sensors. It is not designed for thermocouples. Sensor not included. The board provides the RTD excitation and interfaces via SPI for easy integration with common microcontrollers and singleboard computers.