Quote:
Originally Posted by Josh8loop
Poo, that stinks about the speed. Maybe the total LED brightness will change with varying PWM signal. I've never tried it, so I don't know.
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The brightness will vary. If you can set the proper resistance, the difference between 1mA average current and 10mA average current is obvious on an LED.
Your typical LED drops 2V, so your resistor will see 12V when the solenoid is energized. Use a value of 1K ohms, and at 90% duty, you will have about 10mA average current, and 10% duty you will have about 1mA.
Install the resistor in series with the LED, and wire the series set across the terminals of the solenoid.