Question

What does each line in the code?? Please

unsigned Long timer1;
unsigned Long button_dbnc_tmr = 0;
const int User_Button = 2;
const int USER_LED_Pin = 13;
bool allow_change = 0;
int counter = 0;
int state;
void read_state_from_memory(void);
void write_state_to_memory(void);
void turnoff(void);
void flash_1s(void);
void flash_2s(void);
void flash_3s(void);

void setup()
{
read_state_from_memory();
pinMode(USER_LED_Pin, OUTPUT);
Serial.begin(9600);
}
void loop()
{
timers();
if(digitalRead(User_Button) == 1)
{
if(allow_change == 1)
{
state++;
Serial.println(counter);
Serial.println(state);
allow_change = 0;
if(state > 3)
state = 0;
write_state_to_memory();
}
}
}
else
{    counter = 0;
    allow_change = 1;
button_dbnc_tmr = 0;
}
switch(state_
{
case 0:
turn off();
break;
case 1:
flash_1s();
break;
case 2:
flash_2s();
break;
case 3:
flash_3s();
break;
}
}
void turnoff()
{

//complete by me

}
void flash_1s()
{
//complete by me

}
void flash_2s()
{
//complete by me

}
void flash_3s()
{
//complete by me

}
void timers(void)
{
static unsigned Long ms_runtime;
static int one_ms_timer;

if(millis() > (ms_runtime + 1))
{   ms_runtime = ms_runtime + 1;
one_ms_timer++;
}
else if(ms_runtime > millis())x
ms_runtime = millis();

if(one_ms_timer > 99)
{   one_ms_timer = 0;
button_dbnc_tmr++;
timer1++;
}
}
void read_state_from_memory ()
{
//to be completed by me
}
void write_state_to_memory()
{
//to be completed by me
}

Answer 1

The purpose of each line is added as command line.

// Declare global variable timer1 as unsigned Long (32 bit size)

unsigned Long timer1;

// Declare global variable button_dbnc_tmr as unsigned Long and initialize it to 0

unsigned Long button_dbnc_tmr = 0;

// Declare constant User_Button as integer type and initialize it to 2

const int User_Button = 2;

// Declare constant USER_LED_Pin as integer type and initialize it to 13

const int USER_LED_Pin = 13;

// Declare boolean variable allow_change and initialize it to 0

bool allow_change = 0;

// Declare integer variable counter and initialize it to 0

int counter = 0;

// Declare integer variable state

int state;

// Declare user defined function read_state_from_memory with void parameter and no return values

void read_state_from_memory(void);

// Declare user defined function write_state_to_memory with void parameter and no return values

void write_state_to_memory(void);

// Declare user defined function turnoff with void parameter and no return values

void turnoff(void);

// Declare user defined function flash_1s with void parameter and no return values

void flash_1s(void);

// Declare user defined function flash_2s with void parameter and no return values

void flash_2s(void);

// Declare user defined function flash_3s with void parameter and no return values

void flash_3s(void);

// Define a user defined function setup to setup Arduino

//function setup which is used to setup the Arduino

void setup()

{

    //calling the function read_state_from_memory()

read_state_from_memory();

//calling the function pinMode() as Pins configured as OUTPUT mode , We pass USER_LED_Pin which is we declared in the begining

//Here we pass pin as USER_LED_Pin and the mode as OUTPUT

pinMode(USER_LED_Pin, OUTPUT);

//Serial.begin(9600) passes the value 9600 to the speed parameter. This tells the Arduino to get ready to exchange messages with the Serial Monitor at a data rate of 9600 bits per second.

Serial.begin(9600);

}

//// Define a user defined function loop()

void loop()

{

    //calling the function timers()

timers();

//digitalRead() function will read the value from digital pin User_Button and return HIGH or LOW

if(digitalRead(User_Button) == 1)

{

    //true block

    //check the value in the variable allow_change is 1?

if(allow_change == 1)

{

    //increase value of state

state++;

//Serial.println() function will print the counter value with a newline character

Serial.println(counter);

//Serial.println() function will print the state value with a newline character

Serial.println(state);

// change the value of allow_change to zero

allow_change = 0;

//change the value of state to zero if the current value of variable state is greater than 3

if(state > 3)

{

state = 0;

//call function write_state_to_memory()

write_state_to_memory();

}

}

}

// else case of first if clause

else

{

    //change the values of counter , allow_change,button_dbnc_tmr

    counter = 0;

    allow_change = 1;

button_dbnc_tmr = 0;

}

//switch block for state variable, the functions turn_off(),flash_1s(),flash_2s() or flash_3s() will be called according to the value in state variable;

switch(state)

{

case 0:

turn_off();

break;

case 1:

flash_1s();

break;

case 2:

flash_2s();

break;

case 3:

flash_3s();

break;

}

}

//defenition of the function turnoff() that might be contain the code to turn off the Arduino

void turnoff()

{

//complete by me

}

//defenition of the function flash_1s that does not return aby value

void flash_1s()

{

//complete by me

}

//defenition of the function flash_2s that does not return aby value

void flash_2s()

{

//complete by me

}

//defenition of the function flash_2s that does not return aby value

void flash_3s()

{

//complete by me

}

// user defined function timers

void timers(void)

{

    //declare two static variables Long ms_runtime and one_ms_timer

static unsigned Long ms_runtime;

static int one_ms_timer;

//the function millis() will return the number of milliseconds at the time, the Arduino board begins running the current program

//the time will compared with the value ms_runtime + 1, If the running time is higher than ms_runtime + 1.

if(millis() > (ms_runtime + 1))

{   

    //true cawse :value of ms_runtime and one_ms_timer will be incrimented

    ms_runtime = ms_runtime + 1;

one_ms_timer++;

}

//else check the ms_runtime is greater than the number of milliseconds at the time, the Arduino board begins running the current program

//if it is true the value of ms_runtime is changes to the Arduino running time

else if(ms_runtime > millis())x

ms_runtime = millis();

//check the value one_ms_timer which is updated in the true case of above if condition ,is greater than 100, then it will round to zero

if(one_ms_timer > 99)

{ one_ms_timer = 0;

// the value of button_dbnc_tmr and timer1 is incrimented by 1

button_dbnc_tmr++;

timer1++;

}

}

//defenition of function read_state_from_memory ()

void read_state_from_memory ()

{

//to be completed by me

}

//defenition of function write_state_to_memory()

void write_state_to_memory()

{

//to be completed by me

}