-DESCRIPTION
This pressure sensor from Freescale is a great low-cost sensing solution for
measuring barometric pressure. At 1.5 hPa resolution, it's not as precise as our
favorite pressure sensor, the BMP085, which has up to 0.03 hPa resolution so we
don't suggest it as a precision altimeter. However, it's great for basic barometric
pressure sensing. The sensor is soldered onto a PCB with 10K pull-up resistors on
the I2C pins.
This chip is good for use with power and logic voltages ranging from 2.4V to 5.5V
so you can use it with your 3V or 5V microcontroller. There's a basic temperature
sensor inside but there's no specifications in the datasheet so we're not sure how
accurate it is.
This chip looks and sounds a whole lot like the MPL3115A2 but this is the less
precise version, best for barometric sensing only
Using the sensor is easy. For example, if you're using an Arduino, simply connect
the VDD pin to the 5V voltage pin, GND to ground, SCL to I2C Clock (Analog 5 on
an UNO) and SDA to I2C Data (Analog 4 on an UNO). Then download our MPL115A2
Arduino library and example code for temperature, pressure and basic altitude
calculation. Install the library, and load the example sketch. Immediately you'll have
the temperature, pressure and altitude data printed in the serial console.
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://www.adafruit.com/
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