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With a simple Arduino Pro Mini Board and a few other components, projects can be realized today for little money that would have been unthinkable or cost a small fortune 20 or 30 years ago. From simple LED effects to a charging station - which puts the battery through its paces - there is a lot in this book. The microcontroller used in all the projects described is the ATmega328, which with its 20 input and output lines offers countless possibilities for measuring, switching and controlling. With a 7-segment display and a few resistors, it can be used to build a voltmeter, for example, or a thermometer using an NTC. The Arduino platform offers the perfect development environment for programming the boards. In addition to the very concrete projects, the book should also provide the necessary knowledge to realize your own ideas. How do you measure what? Which transistor is the right one to switch different loads? When is it better to use an IC, or how do you switch mains voltage? Also battery powered projects with LilyPad are discussed in detail. Also many different motors, from simple DC motors to stepper motors. Sensors are another exciting topic. Just two examples: A tiny component can actually measure that the air pressure on the floor is higher than at table height. With a simple infrared receiver, you can give a second life to old remote controls and use them to control your home.