Add CedarGrove ShadowWatcher and PunkConsole Helper Classes

[CedarGroveStudios]

ShadowWatcher is a CircuitPython helper class to detect a shadow cast over an analog light sensor such as the ALS-PT19 phototransistor used in the Adafruit PyPortal, PyGamer, PyBadge, CircuitPlayground Express, CircuitPlayground Bluefruit, and the ALS-PT19 breakout board. Incorporates a low-pass filter to reduce sensitivity to flickering light levels which may be caused by power line frequency or light dimmer PWM passthrough. Useful as a simple gesture detector.

The CedarGrove Punk Console emulates an astable square-wave oscillator and synchronized non-retriggerable one-shot monostable multivibrator to create the classic stepped-tone generator sound of the Atari Punk Console. As with the original circuit, the oscillator frequency and one-shot pulse width are the input parameters. Instantiation of the Punk Console class will start the output waveform based on the input parameters and enable the output signal if mute=False. Once instantiated, the class is controlled by the frequency, pulse_width_ms, and mute properties.

[tekktrik]

Rad! 😎

[CedarGroveStudios]

Thank you for the quick turnaround again!