Arduino already include on-chip PWM controllers, making this effectuation easy. In short, PWM is a way of digitally encoding analog signal levels. MyDuino! Looking for a solution to build this circuit ...

Pin 9 generates a PWM signal using a time-honored technique. Suppose you want to generate 20/255 (about 8% duty cycle). You take an 8-bit accumulator and add 20 to it repeatedly.

To use with a logic pwm signal (any logic voltage matching the mosfet) you also need a power rail of 5, 12 or 24Vdc that shares a common with the logic. Connect the power rail between the appropriate ...

But generating a smooth voltage in this way takes just a few more parts. [Scott Daniels] spent some time discussing the process of smoothing a PWM output by using a low pass filter.