This is a fairly new sensor that's only been available in a breakout board for a short time and I'm unsure about some of the board's specs and was wondering if anyone had some details. It replaces the BMP180, of which I have several and am using in a weather station I designed and built.
The most commonly sold version of the BMP180 board had air pressure and temperature sensors, and used 5V logic throughout, for power and I2C. The most commonly sold version of the BMP280 board adds a humidity sensor, but I'm not sure about what voltage it uses, for power and I2C.
It appears to be 3.3V, but I'm not sure. Is that just for power, or also for I2C? And if it's 3.3V throughout, can you power it with the 3.3V power out of an Arduino, and can the I2C pins tolerate the Arduino's 5V out signals and send enough power to be read by its in signals?
Also, there's another version of this chip, the BME280. Does anyone know the difference between it and the BMP280?