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{{ENG-CANSAT-NAV}}
== About the BMP280 breakout ==
The BMP280 sensor can measure the atmospheric pressure and temperature (because the temperature also impact the sensor physics).
The BMP280 is a Bosch sensor upgraded from the BMP085/BMP180/BMP183 serie. This sensor is really great to make environmental or weather measurements. Best of all, it can be used over an I2C or a SPI bus!
[[fichier:BMP280.jpg|250px]]
It is one of the best sensor, it offer good accuracy for an affordable price. The accuracy is ±1 hPa for the pressure and ±1.0°C for the temperature. This sensor is not really made to measure the temperature but you can estimate its range with the BMP280.
As the pressure also change with the altitude, the sensor accuracy allows you to use the BMP280 to make an altimeter (with accuracy of ±1m at worste, about 0.25m in best conditions).
To ease the usage of this sensor, the SMD component is solder on a breakout board with some additional passive electronics. The board also bring a level shifter and 3V voltage regulator so it is save for 3V and 5V logic microcontrolers.
=== technical details ===
* [https://df.mchobby.be/datasheet/bmp280.pdf Fiche technique du BMP280] (Bosch, pdf)
* Size: 19.2mm x 17.9mm x 2.9mm
* weight: 1.3 gr
== Install the Library ==
== Install the Library ==
This means that reference weather station applies the correction (compensating) to the read value.
This means that reference weather station applies the correction (compensating) to the read value.
For the reference station next to house, its height is 120m. so the correction adds the air column of 120m height over the sensor value to get the normalized SLP pressire. So the correction is evaluated to (120 / 8.3) hPa = 14.45 hPa.
For the reference station next to house, its height is 120m. so the correction adds the air column of 120m height over the sensor value to get the normalized SLP pressure. So the correction is evaluated to (120 / 8.3) hPa = 14.45 hPa.
{{underline|Let's apply the same principle to our BMP280 readings:}}
{{underline|Let's apply the same principle to our BMP280 readings:}}