BME280 Environmental Sensor
5. If you want to get correct altitude data, you should first measure the atmosphere
pressure of local sea level and then change the define of SEALEVELPRESSURE_HPA
6. Then compile and download to your Arduino board.
7. Open Serial monitor and set the baud rate to 11520
Note: if there are not any data outputted after running the demo code or get wrong
data, please check the hardware connection and address used
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