BoardPilotMAX31865 PT100/PT1000 RTD amplifier with ESP32
Supply 3.3-5 V
Bus SPI
Measures temperature
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| VIN | Power | 3V3 | |
| 3VO | Not wired to the ESP32 | — | 3.3 V output of the on-board regulator. Leave unconnected |
| GND | Ground | GND | |
| CLK | SPI clock | D18 | |
| SDO | SPI MISO | D19 | Data out of the module (SPI MISO) |
| SDI | SPI MOSI | D23 | Data into the module (SPI MOSI) |
| CS | SPI chip select | D5 | |
| RDY | Interrupt | D35 | Data ready (active LOW), optional |
| F+ | Not wired to the ESP32 | — | Force + screw terminal (4-wire RTD) |
| RTD+ | Not wired to the ESP32 | — | RTD + screw terminal |
| RTD- | Not wired to the ESP32 | — | RTD - screw terminal |
| F- | Not wired to the ESP32 | — | Force - screw terminal. Set the 2/3/4-wire jumpers to match your probe |
Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.
Sources
- Maxim MAX31865 datasheet, SPI modes 1 and 3; reference resistor 430 Ω for PT100, 4.3 kΩ for PT1000
- Adafruit MAX31865 guide, Pinout VIN, 3Vo, GND, CLK, SDO, SDI, CS, RDY; 2/3/4-wire jumpers
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.