Getting Started with Adafruit BMP280 Barometric Pressure And Temperature Sensor || BMP280 vs BME280

Some vendors sell BMP280 sensor modules as BME280. It is very difficult to tell the difference between them when buying because they are very similar. BME280 sensors are usually more expensive than BMP280 sensors. The downside of having a BMP280 is that it doesn’t measure humidity, it only measures temperature and pressure.
How to tell if you got a BMP280 sensor? In the following picture, you can see that the BME280 sensor chip is square-shaped, while the BMP280 is more like a rectangle shape.
To be sure that you have a BMP280 sensor, you can install a library compatible with the BMP280 sensor and run an example sketc.
Barometric pressure is the measurement of air pressure in the atmosphere, specifically the measurement of the weight exerted by air molecules at a given point on Earth. Barometric pressure changes constantly and is always different depending on where the reading takes place.
4-pin model BME280
The models with 4 pins only allow I2C communication protocol
6-pin model BME280
There are models with 6 pins that support both I2C and SPI communication protocol.
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[@user-ej1og3cd3n]

what if "No I2C devices found" ?

[@chandanyogesh9475]

why is the altitude coming in negative

[@YellowPurple]

In order to calibrate the BMP280 to give correct relative altitude readings, you need to know the actual altitude at some point. Some other means to determine altitude must be used.Pressure sensors must be recalibrated very frequently.