BMP180 Sensor is an extremely precise low-cost sensor from Bosch for measuring barometric pressure and temperature. Because pressure changes with altitude you can also use it as an altimeter! The sensor is soldered onto a PCB with a 3.3V regulator, I2C level shifter, and pull-up resistors on the I2C pins. It is completely identical to the BMP085 in terms of firmware/software.

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