The Bosch BME280 Sensor Module is a small, low-cost, high-precision environmental sensor that measures temperature, pressure, and humidity. It is designed to be used in a variety of applications, such as smartphones, wearables, drones, and home automation devices, to provide accurate environmental data. The sensor is based on microelectromechanical systems (MEMS) technology and uses a combination of pressure, temperature, and humidity sensing to provide accurate readings. It communicates over I2C or SPI protocols and is compatible with various microcontrollers and development boards.

The humidity sensor features an extremely fast response time, which supports performance requirements for emerging applications such as context awareness and high accuracy over a wide temperature range. The pressure sensor is an absolute barometric pressure sensor with exceptionally high accuracy and resolution at very low noise. The integrated temperature sensor has been optimized for low noise and high resolution. It is primarily used for temperature compensation of the pressure and humidity sensors and can also be used for estimating ambient temperature.

The BME280 Sensor Module supports a full suite of operating modes, which provides the flexibility to optimize the device for power consumption, resolution, and filter performance.

Pinout of the BME280 Sensor Module:

• VCC: Supply voltage: 3.3 V
• GND: Ground
• SCL: clock signal I2C or SPI
• SDA: Data line I2C or MOSI in SPI mode
• CSB: Chip Select
• SD0: MISO in SPI mode

Example applications:

• Context awareness, e.g. skin detection, room change detection 
• Fitness monitoring and well-being
• Warning regarding dryness or high temperatures
• Measurement of volume and air flow
• Home automation control
• Control heating, ventilation, and air conditioning (HVAC)
• Internet of Things
• GPS enhancement (e.g. time-to-first-fix improvement, dead reckoning, slope detection)
• Indoor navigation (change of floor detection, elevator detection)
• Outdoor navigation, leisure and sports applications
• Weather forecast
• Vertical velocity indication (rise/sink speed)

Datasheet: https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bme280-ds002.pdf