Someone recently asked if the Arduino could do Multi Touch and it looks like Dangerous Prototypes has the answer.
Open source Multi Touch, known as OpenMT, is an open source hardware project for developing multitouch applications. Unlike camera-based multitouch, OpenMT lets you make a thin, flexible multitouch surface. It is Arduino friendly and has been developed by Sensible UI in Seoul, Korea. Users can experiment with hardware development themselves with projects such as ArduMT, or can use OpenMT software to interface with other multitouch devices.
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.