PencilScale, based on Goodman's Plum-O-Meter, is an experimental app that uses a homemade harness to turn the Apple Pencil into an electronic scale that is highly sensitive, but not incredibly accurate.
The experiment works by subtracting the touch's force from a base weight, which is "set as the current touch force when the 'zero' button is pressed," and multiplying it by 140 for a very rough weight in grams.
PencilSynth is an AudioKit-powered synthesizer that can be controlled by the Apple Pencil depending on its orientation and position.
- Apple Pencil's horizontal position on the screen controls frequency
- Apple Pencil's vertical position on the screen controls the modulating multiplier
- Apple Pencil's altitude angle controls the carrier multiplier
- Apple Pencil's azimuth angle controls the modulation index
PencilController is an experimental image processing app that uses the Apple Pencil as a controller for the fine setting of parameters on Core Image filters.
The demo has three image filtering modes:
- Hue/Saturation - Apple Pencil's azimuth angle controls hue and its altitude angle controls the saturation
- Brightness/Contrast - Apple Pencil's altitude angle along North/South controls contrast and the angle along West/East controls brightness
- Gamma/Exposure - Apple Pencil's altitude angle along North/South controls exposure and the angle along West/East controls gamma
The source code for all three projects is available on GitHub.