mcreefer:
I'm using my arduino to dim my leds via PWM and a mosfet. Is if possable to add another MOSFET on the same negitive wire and hook it up with a pot?The idea would be to leave the PWM sketch running so the led has a sunrise and sunset dim. Going all the way from 0 to 255. But the pot would alow me to turn down the power without editing the code. Make since?
No, wiring a second mosfet in parallel to the first one, but controlling this added mosfet with a variable gate voltage via a pot would only allow you to manually increase the brightness on the led, at the point where you are overriding the duty cycle value of the pwm controlled mosfet.