Inverted PWM rev_01

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    - Project: Inverted PWM
    - Source Code NOT compiled for: Arduino Nano
    - Source Code created on: 2025-12-30 00:36:34

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/****** SYSTEM REQUIREMENTS *****/
/****** SYSTEM REQUIREMENT 1 *****/
    /* reverse duty cycle for output pin no. 11 */
/****** END SYSTEM REQUIREMENTS *****/


/* START CODE */

/****** DEFINITION OF LIBRARIES *****/
#include <Arduino.h>

/****** FUNCTION PROTOTYPES *****/
void setup(void);
void loop(void);

// Variable for the PWM output
int pwmPin = 11;

// System Requirement 1: reverse duty cycle for output pin no. 11
// This means that when duty cycle is 0, PWM output should be maximum (255), and when duty cycle is 255, PWM output should be minimum (0).
// We will create a variable for duty cycle and invert it in the loop.

int dutyCycle = 0;
int increment = 1;

void setup() {
    // initialize PWM pin
    pinMode(pwmPin, OUTPUT);
}

void loop() {
    // change duty cycle
    dutyCycle += increment;

    // reverse duty cycle for output pin no. 11
    // invert duty cycle
    int invertedDutyCycle = 255 - dutyCycle;

    // write PWM value to pin
    analogWrite(pwmPin, invertedDutyCycle);

    // change direction at limits
    if (dutyCycle <= 0 || dutyCycle >= 255) {
        increment = -increment;
    }

    // delay for visibility
    delay(10);
}

/* END CODE */