VectorDisplay

Use your phone or tablet as an open source touch-enabled USB-serial / WiFi / Bluetooth display for prototyping projects with Arduino-compatible boards. On the Arduino side, you will need the vectordisplay library github.com/arpruss/vectordisplayarduino which provides a large subset of the Adafruit GFX library. See that library for examples. Your Arduino sketch can specify command buttons for controlling your sketch.