Tiny Scope for Arduino
The screenshots below are on a two-color display (yellow/blue).
Voltmeter mode is automatically switched on with a steady voltage signal (when it would be represented by a flat line).
Requires: Arduino UNO R3 or Teensy USB board and Monochrome 0.96" 128x64 OLED graphic display (SSD1306 driver)
UNO R3 and Teensy 3.1 (with upside-down display mode).
Either use Sketch -> Import Library or make a libraries folder and drop them in there.