The polarity setting of the pin is as follows:. 
SoftPWMSetFadeTime(ALL, 100, 400) - this will set all created channels to have a fade-up time of 100 ms and a fade-down time of 400.
You can use ALL in place of the pin number to have the function act on all currently set channels. polarity is the polarity for the given pin. fadedowntime is the time in milliseconds that it will take the channel to fade from 255 to 0. fadeuptime is the time in milliseconds that it will take the channel to fade from 0 to 255. SoftPWMSetFadeTime(pin,fadeUpTime,fadeDownTime) percent is a value between 0 and 100 (inclusive). value is a value between 0 and 255 (inclusive). Values: SOFTPWM_NORMAL, SOFTPWM_INVERTED. optional defaultPolarity allows all newly defined pins to take on this polarity. Initializes the library - sets up the timer and other tasks. Wait for LED to turn on - you could do other tasks here Set fade time for pin 13 to 100 ms fade-up time, and 500 ms fade-down time Unzip the folder and rename it to SoftPWM, then move it to your arduinosketchfolder/libraries/ folder. You can use the Arduino Library Manager (Sketch -> Include Library -> Manage Libraries.) to download the library.Īlternatively, you can download the library directly, and install it yourself. Up to 20 different channels can be created. It uses a single hardware timer (Timer 2 on AVR, or IntervalTimer on Teensy 3.x) on the microcontroller to generate up to 20 PWM channels. It was originally designed for use controlling the brightness of LEDs, but could be modified to control servos and other low frequency PWM controlled devices as well. A Wiring Framework (and Arduino) Library to produce PWM signals on any arbitrary pin.
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