We all know the Arduino as a versatile electronics prototyping tool, but it is often lacking in applications that require higher amperage. In response to this, a team of designers and programmers created Heatit, an open-source board in its final stages of design based on Arduino that also has the capability to deliver eight outputs at 12v and 500mA each. Output pins can also be combined for even higher amperages.
This means that with Heatit you can control materials and devices such as thermochromic ink and paint, conductive thread, muscle wire, laser diodes, and solenoids. It also has standard 5V I/Os enabling it to use a variety of sensors, switches, etc. The slim design and use of through-holes also make it ideal for wearable applications.