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| == About the BMP280 breakout == | | == About the BMP280 breakout == |
− | The BMP280 sensor can measure the atmospheric pressure and temperature (because the temperature also impact the sensor physics). | + | The BMP280 sensor can measure the atmospheric pressure and temperature. As the temperature also impact the sensor physics, the sensor measure it to apply appropriate correction to the measured pression. |
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| 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! | | 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! |
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− | [[fichier:BMP280.jpg|250px]] | + | [[fichier:BMP280.jpg|250px]] [[fichier:BMP280-v2.jpg|250px]] |
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| 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. | | 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. |
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− | 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). | + | 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 worst, about 0.25m in best conditions). |
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| 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. | | 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. |