Adafruit MAX31865 RTD Amplifier Breakout
SPI resistance-to-digital converter breakout supporting 2-, 3-, and 4-wire PT100 and PT1000 RTDs. Reference resistor is 430 Ω (PT100) or 4300 Ω (PT1000). Supply: 3.3 V or 5 V.
SPI resistance-to-digital converter breakout supporting 2-, 3-, and 4-wire PT100 and PT1000 RTDs. Reference resistor is 430 Ω (PT100) or 4300 Ω (PT1000). Supply: 3.3 V or 5 V.
Supply voltage — 3.3 V or 5 V; Adafruit breakout has onboard 3.3 V LDO
Ground reference
SPI clock from ESP32-S3
SPI MOSI — data in to MAX31865
SPI MISO — data out from MAX31865
SPI chip-select (active low); assign a free GPIO on ESP32-S3, avoid flash/JTAG pins
Data-ready interrupt output — optional; can poll instead
RTD force positive (connect to one RTD lead / Pt probe terminal)
RTD force negative (connect to other RTD lead / Pt probe terminal)
RTD sense positive (2-wire: jumper to F+; 4-wire: separate sense lead)
RTD sense negative (2-wire: jumper to F-; 4-wire: separate sense lead)
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VIN | power | Supply voltage — 3.3 V or 5 V; Adafruit breakout has onboard 3.3 V LDO | 3.3 | |
| GND | ground | Ground reference | ||
| SCK | spi | SPI clock from ESP32-S3 | ||
| SDI | spi | SPI MOSI — data in to MAX31865 | ||
| SDO | spi | SPI MISO — data out from MAX31865 | ||
| CS | spi | SPI chip-select (active low); assign a free GPIO on ESP32-S3, avoid flash/JTAG pins | ||
| DRDY | data | Data-ready interrupt output — optional; can poll instead | ||
| F+ | data | RTD force positive (connect to one RTD lead / Pt probe terminal) | ||
| F- | data | RTD force negative (connect to other RTD lead / Pt probe terminal) | ||
| RTD+ | data | RTD sense positive (2-wire: jumper to F+; 4-wire: separate sense lead) | ||
| RTD- | data | RTD sense negative (2-wire: jumper to F-; 4-wire: separate sense lead) |
I2C · SPI · Single data line · 3.3 – 5 V · Breakout
Verify supply voltage and logic levels before powering up.
Module pins: VIN, GND, SCK, SDI, SDO, CS. Schematik maps them to your board in the app.
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