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Three Essential Environmental Sensors in One Compact Breakout
The Adafruit BME280 I2C or SPI Temperature Humidity Pressure Sensor - STEMMA QT is a versatile environmental sensor breakout that combines temperature, humidity, and barometric pressure sensing into one compact board. It is an excellent choice for indoor monitoring, weather-related projects, altitude estimation, portable logging systems, and general environmental sensing.
Built around the reliable Bosch BME280, this breakout gives you a cost-effective way to collect multiple environmental readings without needing separate sensors. Since it supports both I2C and SPI, it is easy to integrate into many Arduino, Raspberry Pi, Feather, and other microcontroller projects.
Important: This breakout includes onboard 3.3V regulation and logic level shifting, so it can be used with both 3V and 5V microcontrollers. It is also compatible with STEMMA QT and SparkFun Qwiic I2C ecosystems for fast solderless connections.
Why you'll love it
- 3-in-1 environmental sensing: Measures temperature, humidity, and pressure from one compact breakout
- Flexible communication options: Supports both I2C and SPI
- Good measurement performance: Great for hobby, educational, and embedded monitoring projects
- Altitude-friendly pressure sensing: Pressure readings can also be used for altitude estimation
- 3V and 5V compatible: Onboard regulator and level shifting simplify wiring
- STEMMA QT / Qwiic ready: Easy solderless I2C hookup for quick prototyping
What you can build
This breakout is ideal for indoor climate monitors, portable weather stations, altitude-aware devices, greenhouse monitoring, room comfort logging, IoT environmental dashboards, and data-logging projects that need more than just temperature sensing.
Starter bundles
Pair it with an Arduino-compatible board, Adafruit Feather, or Raspberry Pi, along with a STEMMA QT cable, jumper wires, and a small display for a complete environmental monitor.
Recommended add-ons
Useful add-ons include OLED displays, microSD logging boards, battery packs, enclosures, and other environmental sensors if you want to expand into air quality or gas monitoring.
Technical specifications
| Product | Adafruit BME280 I2C or SPI Temperature Humidity Pressure Sensor - STEMMA QT |
|---|---|
| Main Sensor | Bosch BME280 |
| Measured Values | Temperature, relative humidity, and barometric pressure |
| Humidity Accuracy | ±3% RH |
| Pressure Accuracy | ±1 hPa absolute accuracy |
| Temperature Accuracy | ±1.0°C |
| Altitude Resolution | Can be used as an altimeter with about ±1 meter or better accuracy |
| Low Altitude Noise | 0.25 m |
| Communication Interface | I2C or SPI |
| Logic / Power Compatibility | Works with 3V or 5V systems using onboard 3.3V regulator and level shifting |
| Connector Type | STEMMA QT / Qwiic-compatible JST SH connectors for I2C |
| Dimensions | 25.2mm × 18.0mm × 4.6mm |
Pinout & usage notes
Use I2C when you want simple wiring and easy integration with other sensors. Use SPI when you prefer a dedicated bus or want to avoid I2C address conflicts in more complex builds.
Since pressure changes with altitude, the BME280 can also be used for elevation-aware applications. That makes it useful not just for weather and room sensing, but also for portable instrumentation and altitude-tracking projects.
What’s in the box
1 × Adafruit BME280 Temperature, Humidity, and Pressure Sensor Breakout
Frequently Asked Questions
What does the BME280 measure?
It measures temperature, humidity, and barometric pressure in one sensor.
Can I use it with Arduino or Raspberry Pi?
Yes. It works with many common development platforms and supports both I2C and SPI.
Is it 3.3V or 5V compatible?
It supports both, thanks to the onboard regulator and logic level shifting.
Can it be used for altitude measurements?
Yes. Pressure readings can be used to estimate altitude, making it useful as a compact altimeter.
Does it support STEMMA QT?
Yes. This version is in the STEMMA QT form factor and is also compatible with Qwiic I2C connections.
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
- Bosch datasheet pdf
- Adafruit Eagle (BRD + SCH) zip
- GitHub PCB repo git
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