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[color=#000080;]Thank you Lunddahl[/color] and NeonMika, after these days study,I found in Netduino2 must use "led1 =new PWM(PWMChannels.PWM_ONBOARD_LED,1000,.5,false);" to generate a PWM, and "PWM PWM_R = new PWM(Pins.GPIO_PIN_D6);" is only suit for Netduino1,I guess. Do you agree with me?