I'm currently working on a project where when a switch is open (unpressed), LED-1 should be lit. When the same switch is closed (pressed), LED-1 will be lit BRIGHTER. Once the button is released the LED will go back to its original lit state. This can be easily achieved using PWM pins.
However, I need more PWM pins for the project I'm building that my board can provide. (Arduino Mega 1280 clone).
So my question is: Is it possible to control LED brightness using NON PWM DIGITAL PINS?