Water-resistant barometric pressure sensor breakout (LPS35HW) with I2C or SPI interface, supporting both absolute and relative pressure measurement in damp environments. Arduino SPI support only; CircuitPython and Raspberry Pi use I2C.
Power input for the breakout; Adafruit Learn states the onboard regulator accepts 3-5 VDC and should be powered at the host logic level.
3.3 V regulator output from the breakout; Adafruit Learn states up to 100 mA may be drawn.
Common ground for power and logic.
I2C clock pin; also SPI clock input when using SPI. Adafruit Learn says breakout logic pins are level-shifted and safe at the VIN logic level.
I2C data pin; also SPI data input / microcontroller-out sensor-in when using SPI.
SPI serial data output / microcontroller-in sensor-out. Leave disconnected for I2C use per Adafruit Learn.
SPI chip-select input; pull low to start an SPI transaction. Leave disconnected for I2C use per Adafruit Learn.
Interrupt output pin configurable for pressure threshold events; Adafruit Learn states the voltage level is the same as Vcc.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VIN | power | Power input for the breakout; Adafruit Learn states the onboard regulator accepts 3-5 VDC and should be powered at the host logic level. | 3-5 VDC input, same as host logic level | |
| 3Vo | power | 3.3 V regulator output from the breakout; Adafruit Learn states up to 100 mA may be drawn. | 3.3 V output, up to 100 mA | |
| GND | ground | Common ground for power and logic. | 0 V | |
| SCK | signal | I2C clock pin; also SPI clock input when using SPI. Adafruit Learn says breakout logic pins are level-shifted and safe at the VIN logic level. | logic level follows VIN, 3-5 V safe | |
| SDI | signal | I2C data pin; also SPI data input / microcontroller-out sensor-in when using SPI. | logic level follows VIN, 3-5 V safe | |
| SDO | signal | SPI serial data output / microcontroller-in sensor-out. Leave disconnected for I2C use per Adafruit Learn. | logic level follows VIN, 3-5 V safe | |
| CS | signal | SPI chip-select input; pull low to start an SPI transaction. Leave disconnected for I2C use per Adafruit Learn. | logic level follows VIN, 3-5 V safe | |
| INT | signal | Interrupt output pin configurable for pressure threshold events; Adafruit Learn states the voltage level is the same as Vcc. | same as Vcc / VIN logic level |
I2C · SPI · Single data line · 3.3 – 5 V · Breakout
Confirm the data interface matches your host board.
Module pins: VIN, 3Vo, GND, SCK, SDI, SDO, CS, INT. Schematik maps them to your board in the app.
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