[Runtimemicro] has the answer, at least if you are writing PWM code for the Arduino. Their free application lets you set a few parameters, visually see the results, and then generates code for you.

The on period, known as pulse width, is modulated (a.k.a. changed) via the code, allowing you to control the value sent to your components. PWM pins work the same way across all Arduino boards ...

Jetport International Airport Map showing the location of this airport in United States. Portland Airport IATA Code, ICAO Code, exchange rate etc... is also provided. Current time and date at Jetport ...