Platinum RTD Sensor - PT100 - 3 Wire 1 meter long
PT100 platinum RTD probe on a 1 m three-wire cable, 100 Ω at 0°C. Requires a dedicated amplifier (e.g. MAX31865) to convert resistance to temperature; not directly readable by a standard ADC.
Pinout
- RTD lead A
One side of the PT100 platinum resistor element. Adafruit states two wires connect to either side of the platinum resistor.
Type · resistive sensor - RTD lead B
Opposite side of the PT100 platinum resistor element. The sensor is a 100 ohm platinum RTD at 0°C.
Type · resistive sensor - RTD sense lead
Third wire connected to one end of the PT100 element for 3-wire RTD measurement so an amplifier can subtract lead voltage drop. Leave disconnected for 2-wire amplifiers.
Type · sense
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| RTD lead A | resistive sensor | One side of the PT100 platinum resistor element. Adafruit states two wires connect to either side of the platinum resistor. |
Start wiring
I2C · SPI · Single data line · 3.3 – 5 V · Breakout
Verify supply voltage and logic levels before powering up.
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