#include <wiringPi.h>
#include <softPwm.h>
#include <stdio.h>
#include <unistd.h>


// GPIO18 corresponds to pin 1 on
#define LED_PIN_18 1
// GPIO5 corresponds to pin 24 on
#define LED_PIN_5 24  

int main()
 {
    if (wiringPiSetup() == -1)
     {
       return 1;
    }

    // Set the GPIO pins
    pinMode(LED_PIN_18, OUTPUT);
    pinMode(LED_PIN_5, OUTPUT);

    // Gradually increase brightness over 5 seconds

     // Initialize PWM on GPIO18
    softPwmCreate(LED_PIN_18, 0, 100); 
    // Initialize PWM on GPIO5
    softPwmCreate(LED_PIN_5, 0, 100);  

    for (int duty_cycle = 0; duty_cycle <= 100; duty_cycle += 20) 
    {
        softPwmWrite(LED_PIN_18, duty_cycle);
        softPwmWrite(LED_PIN_5, duty_cycle);
        sleep(1);
    }

    // Turn off LEDs for 2 seconds
    softPwmWrite(LED_PIN_18, 0);
    softPwmWrite(LED_PIN_5, 0);
    sleep(2);

    // Increase to full brightness over 1 second
    for (int duty_cycle = 0; duty_cycle <= 50; duty_cycle += 10)
     {
        softPwmWrite(LED_PIN_18, duty_cycle);
        softPwmWrite(LED_PIN_5, duty_cycle);
        // Sleep for 0.5 seconds
        usleep(500000);  
    }

    // Repeat steps 3-5 four times
    for (int repeat = 0; repeat < 4; repeat++) 
    {
        softPwmWrite(LED_PIN_18, 0);
        softPwmWrite(LED_PIN_5, 0);
        sleep(2);

        for (int duty_cycle = 0; duty_cycle <= 50; duty_cycle += 10) {
            softPwmWrite(LED_PIN_18, duty_cycle);
            softPwmWrite(LED_PIN_5, duty_cycle);
            // Sleep for 0.5 seconds
            usleep(500000);  
        }
    }

    // Permanently turn off
    softPwmWrite(LED_PIN_18, 0);
    softPwmWrite(LED_PIN_5, 0);

    return 0;
}