12-08-2021 04:07 PM
For one of our products we are using the BME280 sensor. There are of these 2 sensors in each product. I noticed that in one of the systems, the sensors ambient pressure is much higher than for the other systems. On a single day, two systems indicate ~995 mbar (on both sensors). This seems to be correct since it matches with the weather data for our location. One system however has a pressure of ~1020 mbar on both sensors (in the same room). This deviation seems to be quite high and I don't understand where this could come from. Can someone explain what could cause such large deviations for a single systems ?
What's interesting is that BOTH sensors on this system deviate, so part-to-part variations seem unlikely, since then I would expect to also see this kind of deviations in and between other products.
12-09-2021 03:50 AM
There was BME280 HSMI document, you could check handling, soldering and mounting the BME280 to your PCB.