diff --git a/Group21_Lab06_Task1/main.c b/Group21_Lab06_Task1/main.c
index 1a11395..d899106 100644
--- a/Group21_Lab06_Task1/main.c
+++ b/Group21_Lab06_Task1/main.c
@@ -27,3 +27,8 @@ void GPIO_PORT_F_init(void)
 #define CLOCK_HZ 16000000                                       // Clock frequency of EK-TM4C123GXL
 #define INTEN (1 << 1)                                          // Bit 1 of CSR to enable interrupt
 #define SYSTICK_RELOAD_VALUE(us) ((CLOCK_HZ / 1000000) * (us) - 1) // SysTick reload value in microseconds based on clock frequency
+
+volatile int duty = 50;                                         // Initial duty cycle
+const volatile int PWM_PERIOD = 1000000;                            // Period for 100kHz in microseconds (10ms)
+volatile int ontime = 0;                                        // Variable to track on time
+//volatile bool ledState = false; // State of the LED