SKU: TH2062
Adafruit PT1000 RTD Temperature Sensor Amplifier - MAX31865 is a breakout board for reading platinum resistance temperature detectors with a microcontroller over SPI. It is designed specifically for PT1000 RTDs, which measure 1000Ω at 0°C and are widely used where stability, repeatability, and precise temperature measurement matter.
The MAX31865 is built to measure low RTD resistance accurately and can compensate for lead resistance when used with 3-wire or 4-wire sensors. That makes it a strong choice for lab setups, industrial monitoring, data logging, and other projects where ordinary thermistors may not deliver the same consistency.
This breakout includes a 4300Ω 0.1% reference resistor, onboard 3.3V regulation, and level shifting so it can work with many Arduino-compatible boards and other 3V or 5V logic microcontrollers. Example code is available to help convert the measured resistance ratio into temperature.
Technical details for the PT1000 MAX31865 breakout.
| Brand | Adafruit |
|---|---|
| Chipset | MAX31865 |
| Sensor Compatibility | PT1000 RTD only |
| Supported RTD Wiring | 2-wire, 3-wire, and 4-wire |
| Interface | SPI |
| Reference Resistor | 4300Ω 0.1% |
| Logic / Supply Compatibility | 5V compliant breakout with onboard 3.3V regulator and level shifting |
| Use Case | Temperature measurement or reading variable resistors around 1kΩ range |
The board connects to your controller over SPI and returns the RTD resistance ratio from its internal ADC. From there, firmware or library code can calculate resistance and temperature. Adafruit provides example code for Arduino, Python, and CircuitPython workflows.
It supports 2-wire, 3-wire, and 4-wire RTD probes. For best accuracy, 3-wire and 4-wire configurations help compensate for cable resistance. The board is shipped configured for 4-wire use by default, and 2-wire or 3-wire setups may require jumper changes on the breakout.
Important: a PT1000 RTD sensor is required but not included. This is the PT1000 version of the board with a 4300Ω reference resistor. If you need to use a PT100 sensor, you must use the PT100-specific version instead.
Assembly required: headers and terminal blocks need to be soldered to the breakout before use. Included terminal blocks may be blue or black.
This version is designed for PT1000 RTD sensors. A PT100 sensor will need the PT100 version of the MAX31865 breakout instead.
Yes, it supports 2-wire, 3-wire, and 4-wire PT1000 RTDs. The board is set up for 4-wire use by default, and the wiring/jumpers can be changed for 2-wire or 3-wire sensors.
It uses an SPI interface, with pins for SCK, SDO, SDI, and CS. The supplier notes it can be used with Arduino and other microcontrollers.
Yes, the breakout is 5V compliant and includes onboard 3.3V regulation and level shifting. It is intended to work with both 3V and 5V logic systems.
No, the PT1000 RTD sensor is required but not included. The package includes one assembled MAX31865 breakout board, two 2-pin terminal blocks, and a pin header.
Yes, some soldering is required. The included headers and terminal blocks need to be soldered onto the breakout before connecting it to your project.
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