BMP180 sensor is a cheap temperature and barometric pressure sensor. Sensor can be connected to Arduino using I2C interface. Electronut decided build a simple thermometer and altimeter using this sensor and Arduino for his trip. He took Arduino Pro Mini 3.3V clone and Nokia 5100 LCD to display data either in text or graph view.
Barometric pressure was converted to altitude above sea level by using Sparkfun’s BMP180 software library. LCD also was controlled by using Adafruit Nokia 5100 library. Code became really compact. He came up with neat laser cut enclosure where all electronics and LiPo battery fits in. This is great solution to bring some data from the trips.