Description:
1.The BMP280 sensor, an environmental sensor with temperature, barometric pressure that is the next generation upgrade to the BMP085/BMP180/BMP183.
2.This sensor module is great for all sorts of weather sensing and can even be used in both I2C and SPI.
3.This precision sensor is the best low-cost, precision sensing solution for measuring barometric pressure with ±1 hPa absolute accuraccy, and temperature with ±1.0°C accuracy. Because pressure changes with altitude, and the pressure measurements are so good, you can also use it as an altimeter with ±1 meter accuracy.

Parameters:
Relative humidity range: 0-100%
The temperature range is -40 ° C- + 85 ° C
Humidity measurement response time: 1s
Lag: relative humidity 2%
Pressure range: 300-1100 hPa
Absolute pressure accuracy: Absolute value ± 1hPa
Absolute temperature accuracy: ± 0.5 ° C (at 25 ° C)
Communication interface: I2C, SPI
Working voltage: DC3.3V
Size:Approx. 16* 12mm/0.62"*0.47"(L*W)

Typical Application:
Enhancement of GPS navigation(e.g.time-to-first-fix improvement，dead-reckoning，slope detection)
Indoor navigation（floor detection，elevator detection）
Outdoor navigation，leisure and sports applications
Weather forecast
Health care application（e.g. sirometry）
Vertical velocity indication（e.g. risk/sink speed）
Handsets such as mobile phones ,table PCs,GPS devices
Navigation systems

Package Includeds:
10* BMP280 3.3V Atmospheric Pressure Sensor module
Tip:

The I2C address was 0x76 and not the 0x77 default used by most other sensors.
You have to manually change the address inside the Adafruit_BMP280.h to: #define BMP280_ADDRESS (0x76),Then it started to work.