Task $1$: Introduction to Timers with LED Blinking

Objective: Demonstrate using Timer$1$ to create a precise $1-$second blink interval for an LED without using the delay$()$ function.

Instructions:

Configure Timer$1$ in CTC $($Clear Timer on Compare Match$)$ mode. Set up an interrupt to toggle an LED every second. Verify that the LED blinks with consistent timing by observing the LED behavior.

Type in and debug $($if necessary:

const int ledPin $=13$; $//$ LED on pin $13$

$$

void setup$()\{$

$$ pinMode$($ledPin$,$ OUTPUT$)$;

$$

$//$ Configure Timer$1$ for $1-$second intervals

$$ TCCR$1$A $=0$;$//$ Normal mode

$$ TCCR$1$B $=(1<<$ WGM$12)|(1<<$ CS$12)|(1<<$ CS$10)$; $//$ CTC mode, prescaler $1024$

$$ OCR$1$A $=15624$;$//$ Compare match for $1$ Hz $(1$ second$)$

$$ TIMSK$1=(1<<$ OCIE$1$A$)$;$//$ Enable Timer$1$ compare interrupt

$$ sei$()$;$//$ Enable global interrupts

$\}$

$$

ISR$($TIMER$1\_$COMPA$\_$vect$)\{$

$$ digitalWrite$($ledPin$,!$digitalRead$($ledPin$))$; $//$ Toggle LED

$\}$

$$

void loop$()\{$

$//$ No code needed here; LED is controlled by the timer interrupt