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Update PWM.md

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@ -4,13 +4,14 @@ The ESP32 has up to 16 PWM channels that can be used to drive a variety of devic
`#include "extras/PwmPin.h"`
## *LedPin(uint8_t pin [,float level [,uint16_t frequency]])*
## *LedPin(uint8_t pin [,float level [,uint16_t frequency [,boolean invert]]])*
Creating an instance of this **class** configures the specified *pin* to output a PWM signal suitable for a controlling dimmable LED. Arguments, along with their defaults if left unspecified, are as follows:
* *pin* - the pin on which the PWM control signal will be output
* *level* - sets the initial %duty-cycle of the PWM from from 0 (LED completely off) to 100 (LED fully on). Default=0 (LED initially off)
* *frequency* - sets the PWM frequency, in Hz, from 1-65535 (ESP32 only) or 5-65535 (ESP32-S2 and ESP32-C3). Defaults to 5000 Hz if unspecified, or if set to 0
* *boolean* - if true, the output of the PWM signal will be inverted. Default=false
The following methods are supported: