README.md

MAX31865 - Resistance Temperature Detector Amplifier

The MAX31865 device is a SPI interface Resistance Temperature Detector to Digital Converter.

Documentation

• MAX31865 datasheet

Usage

SpiConnectionSettings settings = new(0, 0)
{
    ClockFrequency = Max31865.SpiClockFrequency,
    Mode = Max31865.SpiMode1,
    DataFlow = Max31865.SpiDataFlow
};

using SpiDevice device = SpiDevice.Create(settings);
using Max31865 sensor = new(device, PlatinumResistanceThermometerType.PT1000, ResistanceTemperatureDetectorWires.ThreeWire, ElectricResistance.FromOhms(4300));

while (true)
{
    Console.WriteLine($"Temperature: {sensor.Temperature.DegreesCelsius} ℃");

    // wait for 2000ms
    Thread.Sleep(2000);
}

Note: You can use any PT100 or PT1000 temperature sensor which has 2/3/4 wires.

Hardware Required

• MAX31865
• Male/Female Jumper Wires

Circuit

The following fritzing diagram illustrates one way to wire up the MAX31865 Resistance Temperature Detector to Digital Converter with a Raspberry Pi

• SDI - MOSI
• SDO - MISO
• CLK - SCLK
• CS - CE0
• VIN - 3V
• GND - GND

Known limitations

This version only performs the one shot temperature conversion and not the continuous temperature conversion.