Adafruit LPS35HW Water Resistant Pressure Sensor

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.

Logical pinout · physical placement not verified

VIN
Power input for the breakout; Adafruit Learn states the onboard regulator accepts 3-5 VDC and should be powered at the host logic level.
Type · PowerVoltage · 3-5 VDC input, same as host logic level
3Vo
3.3 V regulator output from the breakout; Adafruit Learn states up to 100 mA may be drawn.
Type · PowerVoltage · 3.3 V output, up to 100 mA
GND
Common ground for power and logic.
Type · GroundVoltage · 0 V
SCK
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.
Type · SPIVoltage · logic level follows VIN, 3-5 V safe
SDI
I2C data pin; also SPI data input / microcontroller-out sensor-in when using SPI.
Type · SignalVoltage · logic level follows VIN, 3-5 V safe
SDO
SPI serial data output / microcontroller-in sensor-out. Leave disconnected for I2C use per Adafruit Learn.
Type · SignalVoltage · logic level follows VIN, 3-5 V safe
CS
SPI chip-select input; pull low to start an SPI transaction. Leave disconnected for I2C use per Adafruit Learn.
Type · SPIVoltage · logic level follows VIN, 3-5 V safe
INT
Interrupt output pin configurable for pressure threshold events; Adafruit Learn states the voltage level is the same as Vcc.
Type · SignalVoltage · same as Vcc / VIN logic level

Pin	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	SPI	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	SPI	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

Logical pinout · physical placement not verified

Pin details

8 connections

VIN
Power input for the breakout; Adafruit Learn states the onboard regulator accepts 3-5 VDC and should be powered at the host logic level.
PowerVoltage · 3-5 VDC input, same as host logic level
3Vo
3.3 V regulator output from the breakout; Adafruit Learn states up to 100 mA may be drawn.
PowerVoltage · 3.3 V output, up to 100 mA
GND
Common ground for power and logic.
GroundVoltage · 0 V
SCK
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.
SPIVoltage · logic level follows VIN, 3-5 V safe
SDI
I2C data pin; also SPI data input / microcontroller-out sensor-in when using SPI.
SignalVoltage · logic level follows VIN, 3-5 V safe
SDO
SPI serial data output / microcontroller-in sensor-out. Leave disconnected for I2C use per Adafruit Learn.
SignalVoltage · logic level follows VIN, 3-5 V safe
CS
SPI chip-select input; pull low to start an SPI transaction. Leave disconnected for I2C use per Adafruit Learn.
SPIVoltage · logic level follows VIN, 3-5 V safe
INT
Interrupt output pin configurable for pressure threshold events; Adafruit Learn states the voltage level is the same as Vcc.
SignalVoltage · same as Vcc / VIN logic level

Start wiring

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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