Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Chip Model	MAX31865
Supported Sensor Types	PT100, PT1000 RTD
Interface Protocol	SPI (Serial Peripheral Interface)
Operating Voltage	3.0V to 3.6V
Temperature Range	-200°C to +850°C (dependent on RTD)
Resolution	15-bit (0.03125°C per LSB)
Accuracy	±0.5% typical at room temperature
Fault Detection	Open circuit, High/Low voltage monitoring
Board Dimensions	22mm x 18mm
Connector Type	5-pin Screw Terminal Block

6 reviews

Anonymous

Mar 19, 2026

Rating: 5/5

Reliable for HVAC monitoring

I am using three of these to monitor temperatures in different zones of my home automation system. They have been running 24/7 for two months without any drift or errors. Highly recommended.

Anonymous

Mar 14, 2026

Rating: 5/5

Perfect for Arduino Projects

This module works flawlessly with my Arduino Uno. The SPI library provided in the examples made integration very simple. Readings are stable and match my calibrated thermometer within a fraction of a degree.

Anonymous

Mar 08, 2026

Rating: 5/5

Excellent replacement for expensive units

We needed several temperature data loggers for a school project. These modules paired with a Raspberry Pi offered professional-grade results at a fraction of the cost of commercial units.

Anonymous

Mar 07, 2026

Rating: 5/5

Robust fault detection

The built-in fault detection is a lifesaver. It immediately flags when the RTD wire gets disconnected, which prevents my control system from reading erroneous low temperatures. Very reliable module.

Anonymous

Mar 02, 2026

Rating: 3/5

Works but documentation could be better

The hardware itself seems solid, but I struggled a bit with the register configuration for 4-wire vs 3-wire setups. Once I found a forum post explaining the bias resistor settings, it worked fine.

Anonymous

Mar 02, 2026

Rating: 4/5

Great accuracy, needs careful wiring

The sensor is very accurate once set up correctly. I had some noise issues initially because my SPI wires were too long, but after shortening them and adding a capacitor, it works perfectly. Good value for the price.

5 FAQ

Q: Does the package include the PT100 probe?

A: No, this listing is for the detector module only. The PT100 or PT1000 resistance temperature detector probe must be purchased separately.

Q: What is the maximum update rate for temperature readings?

A: The conversion time is typically 60ms. You can read new data approximately every 60-70ms depending on your SPI clock speed and processor overhead.

Q: Does this module support 2-wire PT100 sensors?

A: Yes, it supports 2, 3, and 4-wire configurations. For 2-wire setups, you will need to bridge the appropriate terminals on the screw block as indicated in the datasheet.

Q: Is a separate power supply required for the RTD sensor?

A: No, the MAX31865 provides the necessary excitation current for the RTD directly from the module. You only need to power the module itself with 3.3V.

Q: Can I use this with a 5V microcontroller like standard Arduino?

A: The module operates at 3.3V logic. While it can be powered by 5V VIN on some boards, the SPI pins require 3.3V levels. We recommend using a level shifter if your MCU is strictly 5V logic to avoid damage.

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