MAX31865 PT100/PT1000 RTD to Digital Converter – Arduino
MAX31865 PT100/PT1000 RTD to Digital Converter – Arduino
MAX31865 RTD to Digital Converter Board for PT100 & PT1000 Sensors
Upgrade your Arduino or microcontroller temperature sensing setup with this precision MAX31865 RTD to Digital Converter Module. Designed for compatibility with both PT100 and PT1000 resistance temperature detectors (RTDs), this compact SMD module delivers highly accurate digital temperature readings with minimal wiring effort. Whether you're building a DIY thermostat, a data logger, or an industrial monitoring prototype, this board gives you reliable, high-resolution thermal sensing.
Key Features
- Dual Compatibility: Works seamlessly with both PT100 and PT1000 RTD sensors for flexible project integration.
- MAX31865 Chip: Industry-standard thermocouple/RTD amplifier IC for accurate resistance-to-digital conversion.
- Wide Supply Voltage: Supports both 3.3V and 5V power supplies — perfect for Arduino, Raspberry Pi, ESP32, and other microcontrollers.
- Wide Operating Range: Rated for use between -40°C and 80°C ambient operating temperature.
- SPI Interface: Simple 4-wire SPI communication makes it easy to integrate with your existing codebase.
- SMD Package: Compact surface-mount design keeps your project board clean and space-efficient.
- Plug-and-Play Ready: Ships as a ready-to-use module — no soldering of the IC required.
Technical Specifications
| Chip | MAX31865 |
| Sensor Compatibility | PT100 / PT1000 RTD |
| Supply Voltage | 3.3V / 5V |
| Interface | SPI |
| Operating Temperature | -40°C to 80°C |
| Package | SMD Module |
| Quantity | 1 Module |
| Condition | New |
What's in the Box?
- 1 × MAX31865 PT100/PT1000 RTD to Digital Converter Module
Made in Mainland China.
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Frequently Asked Questions
Q: Is the MAX31865 RTD converter board compatible with Arduino Uno and Mega?
A: Yes! The MAX31865 module communicates via SPI, which is natively supported by Arduino Uno, Mega, Nano, ESP32, ESP8266, Raspberry Pi, and most other popular microcontrollers. Simply connect the VCC, GND, CS, MOSI, MISO, and CLK pins to get started.
Q: Can I use this board with both PT100 and PT1000 RTD sensors?
A: Absolutely. This converter board supports both PT100 (100Ω at 0°C) and PT1000 (1000Ω at 0°C) platinum RTD sensors. You may need to adjust a reference resistor or configuration jumper on the board depending on which sensor type you are using — refer to your module's datasheet for configuration details.
Q: What is the operating voltage for this MAX31865 module?
A: The module supports both 3.3V and 5V supply voltages, making it compatible with a wide range of microcontrollers and single-board computers without the need for a level shifter in most common setups.
Q: What libraries can I use with this module for Arduino?
A: The most commonly used Arduino library for the MAX31865 is the Adafruit MAX31865 library, available through the Arduino Library Manager. It provides straightforward functions for reading temperature in Celsius and Fahrenheit from your PT100 or PT1000 sensor.