MPL3115A2 I2C Barometric Pressure Altitude Sensor Module

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This pressure sensor from Freescale is a great low-cost sensing solution for precision measurement of barometric pressure and altitude. The MPL3115A2 has a typical 1.5 Pascal resolution, which can resolve altitude at 0.3 meters (compare to the BMP180 which can do 0.17m). It has some upsides compared to the BMP280, such as interrupt outputs for ultra-low power usage, and its also a heck of a lot easier to read altitude with a built in altimeter calculation - no calibration reading and calculating required. As a bonus, there's even a fairly good temperature sensor with ±1°C typical accuracy (±3°C max).

This chip likes to be used with 2-3.6V power and logic voltages, so we placed it on a breakout with a 3V regulator and logic level shifting. Its easy to use with any Arduino or microcontroller that has i2c capability.

This chip looks and sounds a whole lot like the MPL115A2 but this is the precision version, which can act as an altitude-sensor as well as barometer

20 the pressure data, output per unit of Pascal
20 height data, output per unit of meter
12 temperature data, output per unit of degree C
I2C digital output interface
2* programmable interrupt pin
Built in 32 sample buffer of FIFO
Working temperature range: -40 to 85 degrees C
Power supply voltage: 2.5 to 5 V
Logic IO port: 2.5 to 5 V
I/O power supply voltage: 1.62 to 3.6 V

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