![]() ![]() => analogWrite(3, 127) //490 Hz signal with 50% duty cycle (On-time) will be at DPin-3 (6) TC2/TCNT2 Module automatically generates 490 Hz PWM signals at DPin-3/11 when the following code is executed. => analogWrite(9, 127) //490 Hz signal with 50% duty cycle (On-time) will be at DPin-9 (5) TC1/TCNT1 Module automatically generates 490 Hz PWM signals at DPin-9/10 when the following code is executed. => analogWrite(6, 127) //980 Hz signal with 50% duty cycle (On-time) will be at DPin-6 (4) TC0/TCNT0 Module automatically generates 980 Hz PWM signals at DPin-6/5 when the following code is executed. ![]() (3) Arduino Development Team has provided this function: analogWrite(arg1, arg2) with the IDE to generate "known frequency but changeable On-time" PWM signals at the indicated DPins of Fig-2. (2) The ATmega328P MCU of the UNO Board supports the generation of PWM signals of different frequencies at the indicated DPins of the following diagram (Fig-10.2). This PWM signal can be used to regulate the speed of an industrial motor, supply of a heating coil, brightness of musical LEDs etc.įigure-10.1: Example of a typical 50 Hz PWM signal. As a result, there is a change in the average value of the PWM signal. (1) "Pulse Width Modulated" signal (PWM) is a rectangular signal (Fig-10.1) where, the frequency is usually fixed but, the ON-time (the Pulse Width or duty cycle) changes in proportional to an "error/feedback/input" signal. ![]()
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