Bosch has stepped up their game with their new BME280 sensor, an environmental sensor with temperature, barometric pressureandhumidity! This sensor is great for all sorts of indoor environmental sensing and can even be used in both I2C and SPI!

This precision sensor from Bosch is the best low-cost sensing solution for measuring humidity with 3% accuracy, barometric pressure with1 hPa absolute accuraccy, and temperature with 1.0C accuracy. Because pressure changes with altitude, and the pressure measurements are so good, you can also use it as an altimeter with 1 meter or better accuracy!

The BME280 is the next-generation of sensors from Bosch, and is the upgrade to the BMP085/BMP180/BMP183 – with a low altitude noise of 0.25m and the same fast conversion time. It has the same specifications, but can use either I2CorSPI. For simple easy wiring, go with I2C. If you want to connect a bunch of sensors without worrying about I2C address collisions, go with SPI.

Nice sensor right? So Adafruit made it easy for you to get right into your next project. The surface-mount sensor is soldered onto a custom made PCB and comes with a 3.3V regulator and level shifting so you can use it with a 3V or 5V logic microcontroller without worry. The breakout is made in theSTEMMA QTform factor, making them easy to interface with. TheSTEMMA QT connectorson either side are compatible with theSparkFun QwiicI2C connectors. This allows you to make solderless connections between your development board and the BME280 or to chain it with a wide range of other sensors and accessories using acompatible cable.

Adafruit even wrote up a nice tutorial with example code for Arduino & CircuitPython, wiring diagrams, schematics, libraries and examples to get you running in 10 minutes!

Technical Details

Datasheets, PCB CAD files, Fritzing object and more available in the product tutorial!

Revision History:

• As of Sep 18, 2023 Adafruit updated this PCB with Adafruit Pinguinto make a lovely and legible silkscreen – you may get the new PCB or the older version with vector fonts – both are identical other than the fancy silkscreen.
• As of Nov 11, 2020Adafruit updated this sensor to be STEMMA QT compatible – that means there’s now an easy way to plug-and-play this sensor without any soldering! The physical shape has changed but the pinout is identical to the non-QT earlier version.

Product Dimensions: 25.2mm x 18.0mm x 4.6mm / 1.0″ x 0.7″ x 0.2″