Physics demonstrations with the Arduino board

In everyday praxis we often need to demonstrate measuring devices-such as thermometers, manometers and voltmeters- with large enough displays that they can easily be read from anywhere in the classroom. In some cases, computers with a measurement interface can be used as a substitute, but often this is not possible (for example in the lab or in an outdoor environment). We present a low-cost basis for demonstration devices that can also be used in situ as data loggers or in the classroom as computer interfaces.