Shows how to use the Adafruit library to read pressure and altitude from the BMP180

sensorexample.py

# sensorexample.py
# Shows how to use the Adafruit library to read pressure and
# altitude from the BMP180

import Adafruit_BMP.BMP085 as BMP085
import time

# This starts the pressure sensor
sensor = BMP085.BMP085()

# This reads the atmospheric pressure in pascals (Pa) when the program starts
starting_pressure = sensor.read_pressure()

# This calculates the altitude compared to where the program was started
relative_altitude = sensor.read_altitude(starting_pressure)

# This loop reads the pressure and calculates the relative altitude
# Notice the {} string formatting so that only two decimal places are printed
while 1:
	current_pressure = sensor.read_pressure()
	relative_altitude = sensor.read_altitude(starting_pressure)
	print 'Pressure = {0:0.2f} Pa'.format(current_pressure)
	print 'Relative Altitude = {0:0.2f} m\n\r'.format(relative_altitude)
	time.sleep(1)