$2\mathrm{.}4$ Write codes in the void setupre to initialise the following:

$($a$)$ Initialise the Serial port to operate at $9600bps$;

$($b$)$ Digital pin D$2,$ D$3$ and D$12$;

$($c$)$ Wait for swo to be press; and

$($d$)$ Send $2$ characters $\text{'}8\text{'}$ followed by $\text{'}S\text{'}$ via serial port to the Bluetooth module.

For $($c$)$ and $($d$).$ you are to call the respective functions in $2\mathrm{.}1$ and $2\mathrm{.}3$

$(8$ marks$)$

$2\mathrm{.}7$ Write codes in the forever loop assisted by the following comments:

You are to declare any variables you used.

void loop $()$

f

$//$ if the reading from PIR motion is HIGH

$//$ Sound the Pizea buzzer

I$/$ Send a message $\text{'}x\text{'}$ To Bluetooth

$\}$

$(3$ marks$)$

$3($a$)$ Write codes to set bit $5$ and bit $7$ of the $8-$bit variable swNal to $1,$ with the rest of the bits of swyal remains unchanged

$($b$)$ Write codes to clear bits $2,5$ and $6$ of the $8-$bit variable aumkal to $0,$ with the rest of the bits of numval remains unchanged

$4$

$($a$)$ If the initial value in the variable num is $016,$ what will be the new value in the variable num after executing the following instruction? Show your working as necessary.

$($b$)$ Write C$-$Statements to print the value of num on Serial Monitor as shown in Figure $1\mathrm{.}1.$

Figure $1\mathrm{.}1$

where NNNNNNNN is the value of num in binary after executing $4($a$)$