Adafruit
Adafruit PT1000 RTD Temperature Sensor Amplifier - MAX31865
The Adafruit PT1000 RTD Temperature Sensor Amplifier is a breakout board for the MAX31865 precision RTD-to-digital converter, configured for PT1000 platinum ...
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The Adafruit PT1000 RTD Temperature Sensor Amplifier is a breakout board for the MAX31865 precision RTD-to-digital converter, configured for PT1000 platinum resistance temperature detectors. It reads 2-, 3-, or 4-wire PT1000 sensors over SPI, delivering laboratory-grade temperature accuracy and repeatability that surpasses thermocouples.
PT1000 RTDs use a platinum resistor element (1,000Ω at 0°C) whose resistance changes predictably with temperature. The MAX31865 handles signal amplification, wire compensation, and analogue-to-digital conversion — you simply read the resistance ratio over SPI and convert to temperature. The board includes a 4,300Ω 0.1% precision reference resistor and is 5V-safe with an on-board 3.3V regulator and level shifting.
Key Features
- MAX31865 RTD Amplifier – Precision ADC with automatic wire resistance compensation
- 2-, 3-, or 4-Wire RTD Support – Compatible with any PT1000 (1,000Ω at 0°C) sensor
- 4,300Ω 0.1% Reference Resistor – Pre-installed for PT1000 sensors
- SPI Interface – Works with any microcontroller; example code provided for temperature calculation
- 5V Safe – On-board 3.3V regulator and level shifting for use with Arduino and other 5V boards
- Screw Terminal Blocks – Two 2-pin terminals for connecting RTD sensor wires
Also Consider
- PT100 Version – Same board with a 430Ω reference resistor for PT100 (100Ω at 0°C) sensors
Ideal For
- Precision temperature measurement in laboratory settings
- Industrial process monitoring and control
- Food and beverage temperature logging
- Scientific instruments requiring high accuracy and repeatability
Package Contents
- 1× Adafruit MAX31865 RTD Amplifier Breakout for PT1000 (assembled)
- 2× 2-pin screw terminal blocks (colour may vary)
- 1× Header strip (requires soldering for breadboard use)
Jargon buster
Plain-language definitions for the technical terms used above.
- 3.3V regulator
- A 3.3V regulator is a power circuit that provides a steady 3.3 volts for parts that need that supply voltage. On a breakout board, it can let the sensor run safely even when the connected microcontroller or power source uses a higher voltage.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- breakout
- A breakout board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- PT1000
- A PT1000 is a platinum resistance temperature sensor whose resistance is 1000 ohms at 0°C and rises predictably as it warms. It is used for accurate, stable temperature measurement; in conductivity or water-quality gear, for example, a PT1000 lets readings be temperature-compensated, since conductivity varies with temperature.
- RTD
- An RTD, or resistance temperature detector, is a temperature sensor whose resistance changes in a predictable way as it heats or cools, giving accurate and stable readings (PT100 and PT1000 are common types). When a product lists an RTD it indicates precise temperature sensing, which also helps applications such as conductivity probes correct their readings for temperature.
- SPI
- A fast serial communication bus often used for displays, memory cards, and sensors. It matters because SPI devices need specific pins for clock and data, plus a separate chip-select line for each device.
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