SKU: TH2057
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Adafruit PT100 RTD Temperature Sensor Amplifier - MAX31865 is a breakout board for reading platinum RTD sensors with excellent stability and repeatability. It is designed specifically for PT100 RTDs, which measure 100 ohms at 0°C, and connects to your controller over SPI.
The MAX31865 is built to measure the very low resistance of RTD elements and can work with 2-wire, 3-wire, or 4-wire PT100 sensors. With 3-wire and 4-wire configurations, it can compensate for lead resistance to improve measurement accuracy in longer cable runs and practical industrial-style installations.
This breakout includes a 430Ω 0.1% reference resistor for PT100 use, plus onboard 3.3V regulation and level shifting, making the board 5V compliant and easy to use with Arduino and many other microcontrollers. Please note: the RTD probe itself is not included, and some soldering is required to attach the included headers and terminal blocks.
Technical details for the Adafruit MAX31865 PT100 RTD amplifier breakout.
| Brand | Adafruit |
|---|---|
| Chipset | MAX31865 |
| RTD Type | PT100 |
| Supported Wiring | 2-wire, 3-wire, 4-wire |
| Interface | SPI |
| Reference Resistor | 430Ω, 0.1% |
| Logic Compatibility | 3.3V / 5V compatible breakout |
This board is a solid choice for precision temperature measurement in lab setups, process monitoring, test rigs, and embedded projects where a PT100 RTD offers better stability than standard thermistors. Pair it with your preferred Arduino, microcontroller, or SBC and use the available example libraries to start reading resistance or calculated temperature over SPI.
This is the PT100 version of the MAX31865 breakout, using a 430Ω 0.1% reference resistor for PT100 RTDs. For a PT1000 sensor, you need the PT1000 version that uses a 4300Ω reference resistor.
The board supports 2-wire, 3-wire, and 4-wire PT100 RTD sensors. It is configured for 4-wire use by default, and can be adjusted for 2-wire or 3-wire wiring using the onboard jumper configuration.
It communicates over SPI using pins such as SCK, SDO, SDI, and CS. The breakout is 5V compliant, includes a 3.3V regulator and level shifting, and is intended for use with Arduino and other microcontrollers.
No, the RTD sensor is not included with this product. The package includes the assembled MAX31865 breakout board, two 2-pin terminal blocks, and a pin header.
Yes, some soldering is required. The headers and terminal blocks need to be soldered to the breakout before use.
Yes, the MAX31865 is designed to compensate for lead resistance in 3-wire and 4-wire RTD setups, which helps improve measurement accuracy. This is especially useful with low-resistance PT100 sensors where cable resistance can affect readings.
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