Arduino Altimeter
Arduino Altimeter http://fritzing.org/projects/altimeter/ This project uses the BMP085 pressure sensor, which communicates over I2C, and requires a load of calibration calculations that are explained in datasheet. Typical accuracy 1 millibar and 2 degrees centigrade. Mode-select button to toggle between altitude, temperature, and pressure pages. Displays your altitude from -9999 to 99999 ft, with rotary encoder used to select the pressure-setting in millibars. Press the encoder to switch to standard atmosphere. The rotary-encoder used in this video is quite basic, so it sometimes gives the wrong direction. Displays temperature in degrees C and F. Displays pressure in millibar. 50-cycle moving-average used to smooth the pressure and altitude readings.
Arduino Altimeter http://fritzing.org/projects/altimeter/ This project uses the BMP085 pressure sensor, which communicates over I2C, and requires a load of calibration calculations that are explained in datasheet. Typical accuracy 1 millibar and 2 degrees centigrade. Mode-select button to toggle between altitude, temperature, and pressure pages. Displays your altitude from -9999 to 99999 ft, with rotary encoder used to select the pressure-setting in millibars. Press the encoder to switch to standard atmosphere. The rotary-encoder used in this video is quite basic, so it sometimes gives the wrong direction. Displays temperature in degrees C and F. Displays pressure in millibar. 50-cycle moving-average used to smooth the pressure and altitude readings.