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Update Extras.md

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@ -10,17 +10,37 @@ PWM on the ESP32 is more flexible, but slighly more complicated, than PWM on mos
### *PwmPin(uint8_t channel, uint8_t pin)*
Creating an instance of this class links one of 16 timer-channels to an ESP32 pin.
Creating an instance of this **class** links one of 16 timer-channels to an ESP32 pin.
* *channel* - an ESP32 timer-channel number (0-15) which will generate the PWM signal
* *channel* - the ESP32 timer-channel number (0-15) to generate the PWM signal
* *pin* - the ESP32 pin that will output the PWM signal produced by the channel
The following methods are supported:
* `void set(uint8_t channel, uint8_t level)`
* sets the PWM %duty-cycle of timer-channel *channel* to *level*, where *level* ranges from 0 (off) to 100 (steady on)
* sets the PWM %duty-cycle of timer-channel *channel* (0-15) to *level*, where *level* ranges from 0 (off) to 100 (steady on)
* `int getPin()`
* returns the pin number
PwmPin also includes a static class function that converts Hue/Saturation/Brightness values (typically used by HomeKit) to Red/Green/Blue values (ypically used to control multi-color LEDS).
* `static void HSVtoRGB(float h, float s, float v, float *r, float *g, float *b)`
* *h* - input Hue value, range 0-360
* *s* - input Saturation value, range 0-1
* *v* - input Brightness value, range 0-1
* *r* - output Red value, range 0-1
* *g* - output Green value, range 0-1
* *b* - output Blue value, range 0-1
See tutorial sketch [10 (RGB_LED)](../examples/10-RGB_LED) for an example of using PwmPin to control an RGB LED.
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