MAX31865 Platinum Resistance Temperature Sensor Module (RTD PT100 / PT1000)

The MAX31865 Platinum Resistance Temperature Sensor Module (RTD PT100 / PT1000) is a high-accuracy digital converter board designed to work with platinum RTD sensors. It efficiently interfaces PT100 or PT1000 temperature probes to digital microcontrollers like Arduino, Raspberry Pi, or ESP32 boards using SPI communication for precise and reliable temperature monitoring.

Built around the MAX31865 IC, this module provides automatic RTD excitation and linearization, reducing the need for external components and calibration circuits. It’s capable of measuring temperatures ranging from -200°C to +850°C with exceptional accuracy, making it ideal for industrial control, scientific research, and environmental monitoring systems.

The MAX31865 supports both 2-wire, 3-wire, and 4-wire configurations, providing flexibility for different RTD wiring standards. With integrated protection features such as open-sensor detection and fault status reporting, it ensures stable operation even in harsh environments.

⚙️ Key Features

• 🌡️ Supports PT100 & PT1000 RTDs – Compatible with platinum resistance sensors.

• ⚙️ SPI Digital Interface – Easy integration with Arduino, Raspberry Pi, and other MCUs.

• 🧭 High Accuracy – Measures from -200°C to +850°C with linear compensation.

• 🧱 MAX31865 Chipset – Built-in signal conditioning and fault detection.

• 🔌 Configurable Wiring – Works with 2, 3, or 4-wire RTD setups.

• 🔋 Low Power Consumption – Efficient for continuous monitoring.

• 🧰 Compact Design – Ideal for embedded and IoT temperature control systems.

• ⚡ Integrated Protection – Open and short-circuit fault detection.

📐 Technical Specifications

🧩 Applications

• 🧪 Industrial Temperature Measurement – For machinery, furnaces, and process control.

• 🌡️ Environmental Monitoring – Accurate ambient and liquid temperature sensing.

• ⚙️ Arduino Projects – Digital temperature monitoring with high precision.

• 💻 Raspberry Pi Systems – Reliable temperature data acquisition for automation systems.

• 🧠 IoT and Smart Devices – For home automation or weather stations.

• 🧰 Scientific Research Labs – For experimental and calibration environments.

⚠️ Precautions

• Use shielded cables for longer RTD sensor connections to reduce interference.

• Ensure proper configuration (2/3/4-wire) for accurate readings.

• Avoid exposure to moisture or extreme vibration to protect circuit integrity.

• Calibrate readings if using long probe extensions.

• Power off before changing wiring connections.

🧰 Recommended Accessories

• 🔌 PT100 Temperature Sensor Probes – Compatible sensors for direct integration.

• 🧠 Arduino Boards – For digital control and temperature logging.

• 💻 Raspberry Pi Accessories – To build advanced IoT-based thermal monitoring systems.

• ⚡ Power Supply Modules – For stable 3.3V–5V DC input.

▶️ YouTube Tutorial Video

🎥 Watch: How to Use MAX31865 with Arduino PT100 Sensor

📝 Product Summary

The MAX31865 RTD PT100/PT1000 Temperature Sensor Module offers industrial-grade accuracy and reliability for temperature measurement in DIY electronics, industrial control, and IoT systems. With its digital SPI output, wide temperature range, and support for multiple wiring configurations, it’s the perfect choice for precision temperature sensing applications.