Water-resistant pressure sensor breakout (LPS33HW) with STEMMA QT/Qwiic connectors, supporting I2C or SPI and both absolute and relative pressure in caustic or damp environments. Arduino SPI support only; CircuitPython and Raspberry Pi use I2C.
Power input for the breakout; Adafruit states the onboard regulator accepts 3-5VDC and converts it to 3.3V for the sensor.
3.3V regulator output from the breakout; Adafruit states up to 100mA can be taken from this pin.
Common ground for power and logic.
I2C clock pin; also the SPI clock input when using SPI.
I2C data pin; also SPI data in / MOSI for data sent from the processor to the LPS33/LPS35 sensor.
SPI data out / MISO for data sent from the LPS33/LPS35 sensor to the processor; leave disconnected for I2C use.
SPI chip-select input; pull low to start an SPI transaction; leave disconnected for I2C use.
Interrupt output configurable for pressure threshold events; low-pressure threshold works in relative mode according to Adafruit.
STEMMA QT / Qwiic I2C connector carrying the board I2C and power interface.
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| VIN | power | Power input for the breakout; Adafruit states the onboard regulator accepts 3-5VDC and converts it to 3.3V for the sensor. | 3-5VDC input | |
| 3Vo | power | 3.3V regulator output from the breakout; Adafruit states up to 100mA can be taken from this pin. | 3.3V output, up to 100mA | |
| GND | ground | Common ground for power and logic. | 0V | |
| SCK | signal | I2C clock pin; also the SPI clock input when using SPI. | Logic level follows VIN, 3-5V logic safe | |
| SDI | signal | I2C data pin; also SPI data in / MOSI for data sent from the processor to the LPS33/LPS35 sensor. | Logic level follows VIN, 3-5V logic safe | |
| SDO | signal | SPI data out / MISO for data sent from the LPS33/LPS35 sensor to the processor; leave disconnected for I2C use. | Logic level follows VIN, 3-5V logic safe | |
| CS | signal | SPI chip-select input; pull low to start an SPI transaction; leave disconnected for I2C use. | Logic level follows VIN, 3-5V logic safe | |
| INT | signal | Interrupt output configurable for pressure threshold events; low-pressure threshold works in relative mode according to Adafruit. | Interrupt output level is the same as Vcc | |
| STEMMA QT | connector | STEMMA QT / Qwiic I2C connector carrying the board I2C and power interface. | Same I2C/power interface as VIN/GND/SCK/SDI |
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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