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Pressure Sensing for Humid, Damp, and Outdoor Builds
The Adafruit LPS35HW Water Resistant Pressure Sensor - STEMMA QT is a compact breakout for measuring barometric pressure and temperature in projects that may face moisture, humidity, or damp conditions. It is a strong fit for weather stations, altitude-aware projects, environmental logging, and any build where a typical open pressure sensor may be more vulnerable.
At the heart of the board is the ST LPS35HW, a barometric pressure sensor with a water-resistant sensing package. The sensing element is protected inside a ceramic package and covered with a waterproof gel, helping prevent moisture from interfering with measurements in normal wet-use situations.
Important: The sensor itself is designed for water-resistant operation, but the
breakout board is not waterproof. If you plan to use it in wet environments, the rest of the board should be sealed or protected.
Why you'll love it
- Water-resistant sensing element: Better suited for damp and humid environments than many standard barometric sensors
- Measures pressure and temperature: Great for environmental monitoring and compensation
- High-resolution output: 24-bit pressure data and 16-bit temperature data
- I2C and SPI support: Flexible connectivity for many microcontroller platforms
- 3V and 5V compatible: Onboard regulator and level shifting make integration easier
- STEMMA QT / Qwiic ready: Quick I2C hookup without soldering
What you can build
This breakout is ideal for weather stations, outdoor sensor nodes, humid-environment monitoring, altitude tracking, pressure trend logging, greenhouse projects, and environmental data collection systems that need reliable barometric readings.
Starter bundles
Pair it with an Adafruit Feather, Raspberry Pi, or Arduino-compatible board, along with a STEMMA QT cable, jumper wires, and a display for a quick pressure-monitoring setup.
Recommended add-ons
Useful add-ons include OLED displays, data logging boards, waterproof enclosures, battery packs, and other environmental sensors for building a more complete monitoring station.
Technical specifications
| Product | Adafruit LPS35HW Water Resistant Pressure Sensor - STEMMA QT |
|---|---|
| Sensor | ST LPS35HW |
| Pressure Range | 260 to 1260 hPa |
| Pressure Data Output | 24-bit |
| Temperature Data Output | 16-bit |
| Interfaces | I2C and SPI |
| Output Data Rate | 1 Hz to 75 Hz |
| Logic / Power Compatibility | Works with 3V or 5V systems via onboard regulator and level shifting |
| Connectors | STEMMA QT / Qwiic-compatible JST SH connectors for I2C |
| Dimensions | 20.5mm × 13.5mm × 3.5mm |
| Weight | 1.2g |
Pinout & usage notes
The board can be used over I2C for simple wiring or SPI when your setup calls for it. The onboard STEMMA QT connectors make I2C hookup especially convenient for modern prototyping systems.
For damp or outdoor projects, keep in mind that the sensing element is water resistant, but the rest of the breakout is still exposed electronics. For long-term wet-environment use, the board should be placed in a protected enclosure or sealed appropriately.
What’s in the box
1 × Adafruit LPS35HW Water Resistant Pressure Sensor - STEMMA QT
1 × small header strip for soldering
Frequently Asked Questions
Is this fully waterproof?
No. The sensor package is water resistant, but the breakout board itself is not waterproof.
What does it measure?
It measures barometric pressure and temperature.
Can I use it with Arduino or Raspberry Pi?
Yes. It supports common maker platforms and works with 3V or 5V systems thanks to onboard regulation and level shifting.
Does it support STEMMA QT?
Yes. It includes STEMMA QT / Qwiic-compatible connectors for solderless I2C use.
What kind of projects is it good for?
It’s a great fit for weather stations, outdoor sensors, humidity-prone builds, and pressure-monitoring projects.
Manila stock. Order before 16:00 PHT, ships today via J&T or LBC. Provincial: 1–3 working days.
Schools / class POs: we accept Purchase Orders for accredited schools and universities. contact us with your PO details.
Returns: 7-day inspection window for DOA units. Email proof of issue and we ship a replacement.
Compatibility & downloads
// downloads
- GitHub PCB repo git
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