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Small green circuit board with surface-mount chips and pin headers

Adafruit

Adafruit PT1000 RTD Amplifier MAX31865

SKU CH-DRCP-C7SE3

Amplifies PT1000 RTD sensors with automatic wire-resistance compensation and SPI output for microcontrollers

  • Product typePrototyping Products
  • Works with 2, 3 or 4-wire PT1000 RTDs for flexible sensor wiring
  • Built-in 3.3 V regulator and level shifting enables 5 V system compatibility
  • Automatic wire-resistance compensation improves measurement accuracy
  • SPI interface lets any microcontroller read the internal ADC resistance ratio
  • Platinum RTD design delivers laboratory-grade temperature stability and repeatability

Precision RTD Amplifier for PT1000 Sensors

This Adafruit breakout board uses the MAX31865 to measure PT1000 resistance temperature detectors. It accepts 2, 3 or 4 wire sensors and automatically compensates for lead resistance. A 3.3V regulator and level shifting make it 5V compliant for direct microcontroller connection. Data is read over SPI from the internal ADC.

Ideal for Lab-Grade Temperature Projects

Engineers and hobbyists building high-accuracy temperature logging or control systems will benefit from PT1000 stability and repeatability. The board suits any microcontroller with an SPI interface. Projects needing thermocouple support or analog voltage output should look at different sensor interfaces.

SPI Interface Decides Microcontroller Compatibility

Communication relies entirely on a hardware or software SPI bus to retrieve the resistance ratio from the converter. The host must provide the clock, data and chip-select lines required by the protocol. Systems without SPI capability cannot use this amplifier without additional bridging hardware.

How it compares

Measured against everything we stock in Engineering Workstations & Dev Kits, at today’s prices. Recalculated every night.

Price $15.99
Pricier than about 67% of the 170 comparable items (median $11.49).

Specifications

Product
Product typePrototyping Products

Questions about this item

Should I choose a 2-wire, 3-wire, or 4-wire PT1000 RTD for this amplifier?

The amplifier works with any 2, 3, or 4 wire PT1000 RTD and automatically compensates for the resistance of the connecting wires, so you can select the wiring style that suits your sensor and cable length.

What does the 1000 ohm resistance at 0°C mean when the sensor is connected to a microcontroller?

The PT1000 RTD provides a baseline of 1000 ohms at 0°C, and the MAX31865 reads the resistance ratio through its internal ADC over SPI, giving your microcontroller a precise digital value that corresponds to temperature.

How does the SPI interface and 3.3V regulator affect the connection to a 5V microcontroller?

The board includes a 3.3V regulator and level shifting, making it 5V compliant so you can connect the SPI pins directly to a 5V microcontroller without additional logic-level converters.

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