We can't find constant dependence of pressure in temperature function. Every BMP280 behaves differently. We are using this sensor for altitude measurement. We are using reference sensor and it works quite well when both sensors are calibrated and stays in the same temperature range, but it's unpredictible when temperature changes. We tested 5-6 different BMP280s and can't find dependence between pressure and temperature. We are using compensation functions from datasheet.
BMP280 temperature compensation problems
Best reply by fish
Hi,
BMP280 TCO typical value is ±1.5Pa/k(25℃-40℃), 3σ value（max/min value) larger than 1.5Pa/k. TCO (0℃-25℃）larger than TCO (25℃-40℃）. From your test photo, 1st and 2nd BMP280 almost follow this TCO value, 3rd BMP280 influenced by other factor. In order to exclude other interference factor, we suggest test at constant pressure chamber and change temperature.
If you check BMP390 datasheet, TCO is ±0.6Pa/k(25℃-40℃), much better than BMP280. BMP390 also the latest pizeo-resistive pressure sensor from BST. If your product used in outdoors, also need consider humidity performance, high recommend BMP390 as your solution.
Best regards.
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