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This module is a digital converter for temperature measurement with PT100 or PT1000 sensors. The conversion method is highly accurate, of the delta-sigma type.
See description for more details about the product.
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This module allows direct reading of the measured temperature with PT100 or PT1000 sensors, the sensitivity of the sensor is adjusted by external resistance, and the data is read directly. The analog-to-digital conversion is done using the high-precision delta-sigma method.
The module also has overvoltage protection (up to +/- 45V) and short circuit detection.
The Datasheet for MAX31865 is available in the Downloads section below.
The recommended calculation method for temperature finding is Callendar-Van Dusen. It is based on the extraction of the temperature from the following equation:
R (T) = R (0) * (1 + aT + bT2 + c (T - 100) T3 )
a, b and c are constants and have the values:
a = 3.90830 x 10-3
b = -5.77500 x 10-7
c = -4.18301 x 10-12 for the interval -200 degrees Celsius - 0 degrees Celsius, 0 for the interval 0 degrees Celsius - +850 degrees Celsius.
1. Make the necessary hardware connections.
The communication interface is SPI. Thus, there are two ways to use this module:
To ensure compatibility with multiple development boards, it is recommended that you use SPI software. The connection scheme is the following (for the 3-wire sensor):
To set up the module to work with PT100 or PT1000 temperature sensors, you must unify the green jumper jumper in the attached picture below as follows:
2. Configure the module according to the temperature sensor.
In the attached picture below is a condenser (green border) that must have:
3. Download the required library.
To use this module, you need to download a library developed by Adafruit. It has the name ADAFRUIT MAX31865 library and can be downloaded either from Manage Libraries or directly from GitHub and add it to your development environment.
Also, in the Downloads section, an Adafruit guide is available for a similar module that can be of use to you.
Here's a sample code for Arduino.
Note: The C1 capacitor on the first sheet of the datasheet must be changed depending on the use with 100 Ω or 1 kΩ thermocouples.
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