GY-BME280 Temperature, Humidity and Atmospheric Pressure Sensor Module
|+25 5 % $8.51|
|+50 7 % $8.29|
|+100 10 % $8.06|
|+300 13 % $7.84|
|+500 15 % $7.62|
The BME280 is a great new chip which was originally designed for the next generation of smartphones.
It is made up of a very accurate pressure sensor and an associated temperature sensor which helps calibrate the pressure readings.
And just for fun they threw in a pretty solid humidity sensor in there as well!
So with an I2C connection you have access to enough weather data to make some pretty good predictions for your local area.
Or you can just use the pressure sensor with it's abililty to discern the difference in 7.5cm in altitude.
The chip contains smarts to smooth out measurements.
Supply Voltage: 1.8 - 5V DC
Interface: I2C (up to 3.4MHz), SPI (up to 10 MHz)
Temperature: -40 to +85°C
Pressure: 300-1100 hPa
Control heating, ventilation, air conditioning (HVAC)
Home automation control
Measurement of volume and air flow
Warning regarding dryness or high temperatures
Outdoor navigation, leisure and sports applications