I'm using the command analogWrite(ledManual, 255); and have the pins connected so they attach to the led positive in, a series 20ohm resistor, and then ground on the Arduino MEGA board. When I read the voltage from pin 2 to ground directly I get 5volts but when I connect them to the resistor, I on…

Arduino PWM only putting out 3.6Volts

system January 27, 2013, 10:54pm 3

a series 20ohm resistor,

You probably want to read the datasheet.