Adafruit PT100 RTD Temperature Sensor Amplifier - MAX31865

The Adafruit RTD Sensor Amplifier with the MAX31865 breakout is a precision temperature sensor designed for use with PT100 RTD (Resistance Temperature Detectors). RTDs are known for their excellent accuracy, stability, and repeatability, and the PT100 specifically has a resistance of 100 ohms at 0°C, making it an ideal choice for high-precision temperature sensing in laboratory and industrial applications.

Key Features:

• Precision temperature sensing: PT100 RTDs provide better accuracy and stability compared to thermocouples or thermistors, making them ideal for applications requiring high-precision measurements.
• Works with 2, 3, or 4-wire RTDs: The MAX31865 amplifier is designed to work with all configurations of PT100 RTDs, offering easy connections and accurate measurements.
• Automatic compensation: The amplifier can compensate for the resistance of the connecting wires, ensuring highly accurate readings.
• SPI communication: Interface the MAX31865 with any microcontroller via SPI to easily read resistance data from the internal ADC.
• 5V compliant: The breakout includes a 3.3V regulator and level shifting so it is compatible with both 3.3V and 5V microcontrollers like Arduino or other development boards.
• Reference resistor: A 430Ω, 0.1% resistor is used as a reference to ensure high-precision readings.

What’s Included:

• 1x MAX31865 RTD amplifier breakout board (assembled and tested)
• 2x 2-pin terminal blocks for connecting the PT100 RTD sensor
• 1x pin header for breadboard or perfboard use
• Note: The PT100 RTD sensor is not included (but available in the shop).

Additional Notes:

• Soldering required: The pin headers need to be soldered to the breakout board before use, but this is a simple task.
• Accuracy: The MAX31865 excels in providing better precision compared to thermocouple amplifiers, making it the ideal choice for temperature measurement where accuracy is critical.

This breakout board provides an easy and effective way to integrate high-precision temperature sensing into your project. Simply connect it to your microcontroller over SPI, use the provided code to calculate temperature based on resistance, and enjoy reliable and repeatable measurements with minimal effort!